<feed xmlns='http://www.w3.org/2005/Atom'>
<title>linux-stable.git/drivers/usb/core, branch v3.18.78</title>
<subtitle>Linux kernel stable tree</subtitle>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/'/>
<entry>
<title>usb: hub: Allow reset retry for USB2 devices on connect bounce</title>
<updated>2017-10-27T08:17:23+00:00</updated>
<author>
<name>Mathias Nyman</name>
<email>mathias.nyman@linux.intel.com</email>
</author>
<published>2017-10-17T13:07:33+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=e9aeba8003dcf81d527d7169c67117d7d994872e'/>
<id>e9aeba8003dcf81d527d7169c67117d7d994872e</id>
<content type='text'>
commit 1ac7db63333db1eeff901bfd6bbcd502b4634fa4 upstream.

If the connect status change is set during reset signaling, but
the status remains connected just retry port reset.

This solves an issue with connecting a 90W HP Thunderbolt 3 dock
with a Lenovo Carbon x1 (5th generation) which causes a 30min loop
of a high speed device being re-discovererd before usb ports starts
working.

[...]
[ 389.023845] usb 3-1: new high-speed USB device number 55 using xhci_hcd
[ 389.491841] usb 3-1: new high-speed USB device number 56 using xhci_hcd
[ 389.959928] usb 3-1: new high-speed USB device number 57 using xhci_hcd
[...]

This is caused by a high speed device that doesn't successfully go to the
enabled state after the second port reset. Instead the connection bounces
(connected, with connect status change), bailing out completely from
enumeration just to restart from scratch.

Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1716332

Signed-off-by: Mathias Nyman &lt;mathias.nyman@linux.intel.com&gt;
Acked-by: Alan Stern &lt;stern@rowland.harvard.edu&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
commit 1ac7db63333db1eeff901bfd6bbcd502b4634fa4 upstream.

If the connect status change is set during reset signaling, but
the status remains connected just retry port reset.

This solves an issue with connecting a 90W HP Thunderbolt 3 dock
with a Lenovo Carbon x1 (5th generation) which causes a 30min loop
of a high speed device being re-discovererd before usb ports starts
working.

[...]
[ 389.023845] usb 3-1: new high-speed USB device number 55 using xhci_hcd
[ 389.491841] usb 3-1: new high-speed USB device number 56 using xhci_hcd
[ 389.959928] usb 3-1: new high-speed USB device number 57 using xhci_hcd
[...]

This is caused by a high speed device that doesn't successfully go to the
enabled state after the second port reset. Instead the connection bounces
(connected, with connect status change), bailing out completely from
enumeration just to restart from scratch.

Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1716332

Signed-off-by: Mathias Nyman &lt;mathias.nyman@linux.intel.com&gt;
Acked-by: Alan Stern &lt;stern@rowland.harvard.edu&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</pre>
</div>
</content>
</entry>
<entry>
<title>usb: quirks: add quirk for WORLDE MINI MIDI keyboard</title>
<updated>2017-10-27T08:17:23+00:00</updated>
<author>
<name>Felipe Balbi</name>
<email>felipe.balbi@linux.intel.com</email>
</author>
<published>2017-10-03T08:16:43+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=6e500be96d0c5ef7d60807001f75f638ec086c7d'/>
<id>6e500be96d0c5ef7d60807001f75f638ec086c7d</id>
<content type='text'>
commit 2811501e6d8f5747d08f8e25b9ecf472d0dc4c7d upstream.

This keyboard doesn't implement Get String descriptors properly even
though string indexes are valid. What happens is that when requesting
for the String descriptor, the device disconnects and
reconnects. Without this quirk, this loop will continue forever.

Cc: Alan Stern &lt;stern@rowland.harvard.edu&gt;
Reported-by: Владимир Мартьянов &lt;vilgeforce@gmail.com&gt;
Signed-off-by: Felipe Balbi &lt;felipe.balbi@linux.intel.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
commit 2811501e6d8f5747d08f8e25b9ecf472d0dc4c7d upstream.

This keyboard doesn't implement Get String descriptors properly even
though string indexes are valid. What happens is that when requesting
for the String descriptor, the device disconnects and
reconnects. Without this quirk, this loop will continue forever.

Cc: Alan Stern &lt;stern@rowland.harvard.edu&gt;
Reported-by: Владимир Мартьянов &lt;vilgeforce@gmail.com&gt;
Signed-off-by: Felipe Balbi &lt;felipe.balbi@linux.intel.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</pre>
</div>
</content>
</entry>
<entry>
<title>USB: core: fix out-of-bounds access bug in usb_get_bos_descriptor()</title>
<updated>2017-10-27T08:17:22+00:00</updated>
<author>
<name>Alan Stern</name>
<email>stern@rowland.harvard.edu</email>
</author>
<published>2017-10-18T16:49:38+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=7c1c88e160ed14dfb02cb35369e27abe01eb2ca5'/>
<id>7c1c88e160ed14dfb02cb35369e27abe01eb2ca5</id>
<content type='text'>
commit 1c0edc3633b56000e18d82fc241e3995ca18a69e upstream.

Andrey used the syzkaller fuzzer to find an out-of-bounds memory
access in usb_get_bos_descriptor().  The code wasn't checking that the
next usb_dev_cap_header structure could fit into the remaining buffer
space.

This patch fixes the error and also reduces the bNumDeviceCaps field
in the header to match the actual number of capabilities found, in
cases where there are fewer than expected.

Reported-by: Andrey Konovalov &lt;andreyknvl@google.com&gt;
Signed-off-by: Alan Stern &lt;stern@rowland.harvard.edu&gt;
Tested-by: Andrey Konovalov &lt;andreyknvl@google.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
commit 1c0edc3633b56000e18d82fc241e3995ca18a69e upstream.

Andrey used the syzkaller fuzzer to find an out-of-bounds memory
access in usb_get_bos_descriptor().  The code wasn't checking that the
next usb_dev_cap_header structure could fit into the remaining buffer
space.

This patch fixes the error and also reduces the bNumDeviceCaps field
in the header to match the actual number of capabilities found, in
cases where there are fewer than expected.

Reported-by: Andrey Konovalov &lt;andreyknvl@google.com&gt;
Signed-off-by: Alan Stern &lt;stern@rowland.harvard.edu&gt;
Tested-by: Andrey Konovalov &lt;andreyknvl@google.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</pre>
</div>
</content>
</entry>
<entry>
<title>USB: devio: Revert "USB: devio: Don't corrupt user memory"</title>
<updated>2017-10-27T08:17:22+00:00</updated>
<author>
<name>Hans de Goede</name>
<email>hdegoede@redhat.com</email>
</author>
<published>2017-10-16T14:21:19+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=d9fbd49c6dfa21738c503e3965bd6e28727652d3'/>
<id>d9fbd49c6dfa21738c503e3965bd6e28727652d3</id>
<content type='text'>
commit 845d584f41eac3475c21e4a7d5e88d0f6e410cf7 upstream.

Taking the uurb-&gt;buffer_length userspace passes in as a maximum for the
actual urbs transfer_buffer_length causes 2 serious issues:

1) It breaks isochronous support for all userspace apps using libusb,
   as existing libusb versions pass in 0 for uurb-&gt;buffer_length,
   relying on the kernel using the lenghts of the usbdevfs_iso_packet_desc
   descriptors passed in added together as buffer length.

   This for example causes redirection of USB audio and Webcam's into
   virtual machines using qemu-kvm to no longer work. This is a userspace
   ABI break and as such must be reverted.

   Note that the original commit does not protect other users / the
   kernels memory, it only stops the userspace process making the call
   from shooting itself in the foot.

2) It may cause the kernel to program host controllers to DMA over random
   memory. Just as the devio code used to only look at the iso_packet_desc
   lenghts, the host drivers do the same, relying on the submitter of the
   urbs to make sure the entire buffer is large enough and not checking
   transfer_buffer_length.

   But the "USB: devio: Don't corrupt user memory" commit now takes the
   userspace provided uurb-&gt;buffer_length for the buffer-size while copying
   over the user-provided iso_packet_desc lengths 1:1, allowing the user
   to specify a small buffer size while programming the host controller to
   dma a lot more data.

   (Atleast the ohci, uhci, xhci and fhci drivers do not check
    transfer_buffer_length for isoc transfers.)

This reverts commit fa1ed74eb1c2 ("USB: devio: Don't corrupt user memory")
fixing both these issues.

Cc: Dan Carpenter &lt;dan.carpenter@oracle.com&gt;
Signed-off-by: Hans de Goede &lt;hdegoede@redhat.com&gt;
Acked-by: Alan Stern &lt;stern@rowland.harvard.edu&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
commit 845d584f41eac3475c21e4a7d5e88d0f6e410cf7 upstream.

Taking the uurb-&gt;buffer_length userspace passes in as a maximum for the
actual urbs transfer_buffer_length causes 2 serious issues:

1) It breaks isochronous support for all userspace apps using libusb,
   as existing libusb versions pass in 0 for uurb-&gt;buffer_length,
   relying on the kernel using the lenghts of the usbdevfs_iso_packet_desc
   descriptors passed in added together as buffer length.

   This for example causes redirection of USB audio and Webcam's into
   virtual machines using qemu-kvm to no longer work. This is a userspace
   ABI break and as such must be reverted.

   Note that the original commit does not protect other users / the
   kernels memory, it only stops the userspace process making the call
   from shooting itself in the foot.

2) It may cause the kernel to program host controllers to DMA over random
   memory. Just as the devio code used to only look at the iso_packet_desc
   lenghts, the host drivers do the same, relying on the submitter of the
   urbs to make sure the entire buffer is large enough and not checking
   transfer_buffer_length.

   But the "USB: devio: Don't corrupt user memory" commit now takes the
   userspace provided uurb-&gt;buffer_length for the buffer-size while copying
   over the user-provided iso_packet_desc lengths 1:1, allowing the user
   to specify a small buffer size while programming the host controller to
   dma a lot more data.

   (Atleast the ohci, uhci, xhci and fhci drivers do not check
    transfer_buffer_length for isoc transfers.)

This reverts commit fa1ed74eb1c2 ("USB: devio: Don't corrupt user memory")
fixing both these issues.

Cc: Dan Carpenter &lt;dan.carpenter@oracle.com&gt;
Signed-off-by: Hans de Goede &lt;hdegoede@redhat.com&gt;
Acked-by: Alan Stern &lt;stern@rowland.harvard.edu&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</pre>
</div>
</content>
</entry>
<entry>
<title>USB: fix out-of-bounds in usb_set_configuration</title>
<updated>2017-10-12T07:18:02+00:00</updated>
<author>
<name>Greg Kroah-Hartman</name>
<email>gregkh@linuxfoundation.org</email>
</author>
<published>2017-09-19T13:07:17+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=0502bf54bd01e8dbf4a057fe76f974074b5fb7e6'/>
<id>0502bf54bd01e8dbf4a057fe76f974074b5fb7e6</id>
<content type='text'>
commit bd7a3fe770ebd8391d1c7d072ff88e9e76d063eb upstream.

Andrey Konovalov reported a possible out-of-bounds problem for a USB interface
association descriptor.  He writes:
	It seems there's no proper size check of a USB_DT_INTERFACE_ASSOCIATION
	descriptor. It's only checked that the size is &gt;= 2 in
	usb_parse_configuration(), so find_iad() might do out-of-bounds access
	to intf_assoc-&gt;bInterfaceCount.

And he's right, we don't check for crazy descriptors of this type very well, so
resolve this problem.  Yet another issue found by syzkaller...

Reported-by: Andrey Konovalov &lt;andreyknvl@google.com&gt;
Tested-by: Andrey Konovalov &lt;andreyknvl@google.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
commit bd7a3fe770ebd8391d1c7d072ff88e9e76d063eb upstream.

Andrey Konovalov reported a possible out-of-bounds problem for a USB interface
association descriptor.  He writes:
	It seems there's no proper size check of a USB_DT_INTERFACE_ASSOCIATION
	descriptor. It's only checked that the size is &gt;= 2 in
	usb_parse_configuration(), so find_iad() might do out-of-bounds access
	to intf_assoc-&gt;bInterfaceCount.

And he's right, we don't check for crazy descriptors of this type very well, so
resolve this problem.  Yet another issue found by syzkaller...

Reported-by: Andrey Konovalov &lt;andreyknvl@google.com&gt;
Tested-by: Andrey Konovalov &lt;andreyknvl@google.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</pre>
</div>
</content>
</entry>
<entry>
<title>usb: Increase quirk delay for USB devices</title>
<updated>2017-10-12T07:18:01+00:00</updated>
<author>
<name>Dmitry Fleytman</name>
<email>dmitry@daynix.com</email>
</author>
<published>2017-09-05T08:40:56+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=8c7124a5295a10043daf2154bc01a437ece9d0f9'/>
<id>8c7124a5295a10043daf2154bc01a437ece9d0f9</id>
<content type='text'>
commit b2a542bbb3081dbd64acc8929c140d196664c406 upstream.

Commit e0429362ab15
("usb: Add device quirk for Logitech HD Pro Webcams C920 and C930e")
introduced quirk to workaround an issue with some Logitech webcams.

The workaround is introducing delay for some USB operations.

According to our testing, delay introduced by original commit
is not long enough and in rare cases we still see issues described
by the aforementioned commit.

This patch increases delays introduced by original commit.
Having this patch applied we do not see those problems anymore.

Signed-off-by: Dmitry Fleytman &lt;dmitry@daynix.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
commit b2a542bbb3081dbd64acc8929c140d196664c406 upstream.

Commit e0429362ab15
("usb: Add device quirk for Logitech HD Pro Webcams C920 and C930e")
introduced quirk to workaround an issue with some Logitech webcams.

The workaround is introducing delay for some USB operations.

According to our testing, delay introduced by original commit
is not long enough and in rare cases we still see issues described
by the aforementioned commit.

This patch increases delays introduced by original commit.
Having this patch applied we do not see those problems anymore.

Signed-off-by: Dmitry Fleytman &lt;dmitry@daynix.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</pre>
</div>
</content>
</entry>
<entry>
<title>USB: devio: Don't corrupt user memory</title>
<updated>2017-10-12T07:18:01+00:00</updated>
<author>
<name>Dan Carpenter</name>
<email>dan.carpenter@oracle.com</email>
</author>
<published>2017-09-22T20:43:46+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=d55567406fbd0c484bd7361d5d35feb037960592'/>
<id>d55567406fbd0c484bd7361d5d35feb037960592</id>
<content type='text'>
commit fa1ed74eb1c233be6131ec92df21ab46499a15b6 upstream.

The user buffer has "uurb-&gt;buffer_length" bytes.  If the kernel has more
information than that, we should truncate it instead of writing past
the end of the user's buffer.  I added a WARN_ONCE() to help the user
debug the issue.

Reported-by: Alan Stern &lt;stern@rowland.harvard.edu&gt;
Signed-off-by: Dan Carpenter &lt;dan.carpenter@oracle.com&gt;
Acked-by: Alan Stern &lt;stern@rowland.harvard.edu&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
commit fa1ed74eb1c233be6131ec92df21ab46499a15b6 upstream.

The user buffer has "uurb-&gt;buffer_length" bytes.  If the kernel has more
information than that, we should truncate it instead of writing past
the end of the user's buffer.  I added a WARN_ONCE() to help the user
debug the issue.

Reported-by: Alan Stern &lt;stern@rowland.harvard.edu&gt;
Signed-off-by: Dan Carpenter &lt;dan.carpenter@oracle.com&gt;
Acked-by: Alan Stern &lt;stern@rowland.harvard.edu&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</pre>
</div>
</content>
</entry>
<entry>
<title>USB: core: Avoid race of async_completed() w/ usbdev_release()</title>
<updated>2017-09-13T21:03:46+00:00</updated>
<author>
<name>Douglas Anderson</name>
<email>dianders@chromium.org</email>
</author>
<published>2017-08-10T22:42:22+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=d512a57678a695275bda7f218d4efccd4f89948c'/>
<id>d512a57678a695275bda7f218d4efccd4f89948c</id>
<content type='text'>
commit ed62ca2f4f51c17841ea39d98c0c409cb53a3e10 upstream.

While running reboot tests w/ a specific set of USB devices (and
slub_debug enabled), I found that once every few hours my device would
be crashed with a stack that looked like this:

[   14.012445] BUG: spinlock bad magic on CPU#0, modprobe/2091
[   14.012460]  lock: 0xffffffc0cb055978, .magic: ffffffc0, .owner: cryption contexts: %lu/%lu
[   14.012460] /1025536097, .owner_cpu: 0
[   14.012466] CPU: 0 PID: 2091 Comm: modprobe Not tainted 4.4.79 #352
[   14.012468] Hardware name: Google Kevin (DT)
[   14.012471] Call trace:
[   14.012483] [&lt;....&gt;] dump_backtrace+0x0/0x160
[   14.012487] [&lt;....&gt;] show_stack+0x20/0x28
[   14.012494] [&lt;....&gt;] dump_stack+0xb4/0xf0
[   14.012500] [&lt;....&gt;] spin_dump+0x8c/0x98
[   14.012504] [&lt;....&gt;] spin_bug+0x30/0x3c
[   14.012508] [&lt;....&gt;] do_raw_spin_lock+0x40/0x164
[   14.012515] [&lt;....&gt;] _raw_spin_lock_irqsave+0x64/0x74
[   14.012521] [&lt;....&gt;] __wake_up+0x2c/0x60
[   14.012528] [&lt;....&gt;] async_completed+0x2d0/0x300
[   14.012534] [&lt;....&gt;] __usb_hcd_giveback_urb+0xc4/0x138
[   14.012538] [&lt;....&gt;] usb_hcd_giveback_urb+0x54/0xf0
[   14.012544] [&lt;....&gt;] xhci_irq+0x1314/0x1348
[   14.012548] [&lt;....&gt;] usb_hcd_irq+0x40/0x50
[   14.012553] [&lt;....&gt;] handle_irq_event_percpu+0x1b4/0x3f0
[   14.012556] [&lt;....&gt;] handle_irq_event+0x4c/0x7c
[   14.012561] [&lt;....&gt;] handle_fasteoi_irq+0x158/0x1c8
[   14.012564] [&lt;....&gt;] generic_handle_irq+0x30/0x44
[   14.012568] [&lt;....&gt;] __handle_domain_irq+0x90/0xbc
[   14.012572] [&lt;....&gt;] gic_handle_irq+0xcc/0x18c

Investigation using kgdb() found that the wait queue that was passed
into wake_up() had been freed (it was filled with slub_debug poison).

I analyzed and instrumented the code and reproduced.  My current
belief is that this is happening:

1. async_completed() is called (from IRQ).  Moves "as" onto the
   completed list.
2. On another CPU, proc_reapurbnonblock_compat() calls
   async_getcompleted().  Blocks on spinlock.
3. async_completed() releases the lock; keeps running; gets blocked
   midway through wake_up().
4. proc_reapurbnonblock_compat() =&gt; async_getcompleted() gets the
   lock; removes "as" from completed list and frees it.
5. usbdev_release() is called.  Frees "ps".
6. async_completed() finally continues running wake_up().  ...but
   wake_up() has a pointer to the freed "ps".

The instrumentation that led me to believe this was based on adding
some trace_printk() calls in a select few functions and then using
kdb's "ftdump" at crash time.  The trace follows (NOTE: in the trace
below I cheated a little bit and added a udelay(1000) in
async_completed() after releasing the spinlock because I wanted it to
trigger quicker):

&lt;...&gt;-2104   0d.h2 13759034us!: async_completed at start: as=ffffffc0cc638200
mtpd-2055    3.... 13759356us : async_getcompleted before spin_lock_irqsave
mtpd-2055    3d..1 13759362us : async_getcompleted after list_del_init: as=ffffffc0cc638200
mtpd-2055    3.... 13759371us+: proc_reapurbnonblock_compat: free_async(ffffffc0cc638200)
mtpd-2055    3.... 13759422us+: async_getcompleted before spin_lock_irqsave
mtpd-2055    3.... 13759479us : usbdev_release at start: ps=ffffffc0cc042080
mtpd-2055    3.... 13759487us : async_getcompleted before spin_lock_irqsave
mtpd-2055    3.... 13759497us!: usbdev_release after kfree(ps): ps=ffffffc0cc042080
&lt;...&gt;-2104   0d.h2 13760294us : async_completed before wake_up(): as=ffffffc0cc638200

To fix this problem we can just move the wake_up() under the ps-&gt;lock.
There should be no issues there that I'm aware of.

Signed-off-by: Douglas Anderson &lt;dianders@chromium.org&gt;
Acked-by: Alan Stern &lt;stern@rowland.harvard.edu&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
commit ed62ca2f4f51c17841ea39d98c0c409cb53a3e10 upstream.

While running reboot tests w/ a specific set of USB devices (and
slub_debug enabled), I found that once every few hours my device would
be crashed with a stack that looked like this:

[   14.012445] BUG: spinlock bad magic on CPU#0, modprobe/2091
[   14.012460]  lock: 0xffffffc0cb055978, .magic: ffffffc0, .owner: cryption contexts: %lu/%lu
[   14.012460] /1025536097, .owner_cpu: 0
[   14.012466] CPU: 0 PID: 2091 Comm: modprobe Not tainted 4.4.79 #352
[   14.012468] Hardware name: Google Kevin (DT)
[   14.012471] Call trace:
[   14.012483] [&lt;....&gt;] dump_backtrace+0x0/0x160
[   14.012487] [&lt;....&gt;] show_stack+0x20/0x28
[   14.012494] [&lt;....&gt;] dump_stack+0xb4/0xf0
[   14.012500] [&lt;....&gt;] spin_dump+0x8c/0x98
[   14.012504] [&lt;....&gt;] spin_bug+0x30/0x3c
[   14.012508] [&lt;....&gt;] do_raw_spin_lock+0x40/0x164
[   14.012515] [&lt;....&gt;] _raw_spin_lock_irqsave+0x64/0x74
[   14.012521] [&lt;....&gt;] __wake_up+0x2c/0x60
[   14.012528] [&lt;....&gt;] async_completed+0x2d0/0x300
[   14.012534] [&lt;....&gt;] __usb_hcd_giveback_urb+0xc4/0x138
[   14.012538] [&lt;....&gt;] usb_hcd_giveback_urb+0x54/0xf0
[   14.012544] [&lt;....&gt;] xhci_irq+0x1314/0x1348
[   14.012548] [&lt;....&gt;] usb_hcd_irq+0x40/0x50
[   14.012553] [&lt;....&gt;] handle_irq_event_percpu+0x1b4/0x3f0
[   14.012556] [&lt;....&gt;] handle_irq_event+0x4c/0x7c
[   14.012561] [&lt;....&gt;] handle_fasteoi_irq+0x158/0x1c8
[   14.012564] [&lt;....&gt;] generic_handle_irq+0x30/0x44
[   14.012568] [&lt;....&gt;] __handle_domain_irq+0x90/0xbc
[   14.012572] [&lt;....&gt;] gic_handle_irq+0xcc/0x18c

Investigation using kgdb() found that the wait queue that was passed
into wake_up() had been freed (it was filled with slub_debug poison).

I analyzed and instrumented the code and reproduced.  My current
belief is that this is happening:

1. async_completed() is called (from IRQ).  Moves "as" onto the
   completed list.
2. On another CPU, proc_reapurbnonblock_compat() calls
   async_getcompleted().  Blocks on spinlock.
3. async_completed() releases the lock; keeps running; gets blocked
   midway through wake_up().
4. proc_reapurbnonblock_compat() =&gt; async_getcompleted() gets the
   lock; removes "as" from completed list and frees it.
5. usbdev_release() is called.  Frees "ps".
6. async_completed() finally continues running wake_up().  ...but
   wake_up() has a pointer to the freed "ps".

The instrumentation that led me to believe this was based on adding
some trace_printk() calls in a select few functions and then using
kdb's "ftdump" at crash time.  The trace follows (NOTE: in the trace
below I cheated a little bit and added a udelay(1000) in
async_completed() after releasing the spinlock because I wanted it to
trigger quicker):

&lt;...&gt;-2104   0d.h2 13759034us!: async_completed at start: as=ffffffc0cc638200
mtpd-2055    3.... 13759356us : async_getcompleted before spin_lock_irqsave
mtpd-2055    3d..1 13759362us : async_getcompleted after list_del_init: as=ffffffc0cc638200
mtpd-2055    3.... 13759371us+: proc_reapurbnonblock_compat: free_async(ffffffc0cc638200)
mtpd-2055    3.... 13759422us+: async_getcompleted before spin_lock_irqsave
mtpd-2055    3.... 13759479us : usbdev_release at start: ps=ffffffc0cc042080
mtpd-2055    3.... 13759487us : async_getcompleted before spin_lock_irqsave
mtpd-2055    3.... 13759497us!: usbdev_release after kfree(ps): ps=ffffffc0cc042080
&lt;...&gt;-2104   0d.h2 13760294us : async_completed before wake_up(): as=ffffffc0cc638200

To fix this problem we can just move the wake_up() under the ps-&gt;lock.
There should be no issues there that I'm aware of.

Signed-off-by: Douglas Anderson &lt;dianders@chromium.org&gt;
Acked-by: Alan Stern &lt;stern@rowland.harvard.edu&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</pre>
</div>
</content>
</entry>
<entry>
<title>usb: Add device quirk for Logitech HD Pro Webcam C920-C</title>
<updated>2017-09-13T21:03:45+00:00</updated>
<author>
<name>Dmitry Fleytman</name>
<email>dmitry@daynix.com</email>
</author>
<published>2017-08-25T07:38:35+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=f638d313156065264fa8d6a8e67cabaa19c6443d'/>
<id>f638d313156065264fa8d6a8e67cabaa19c6443d</id>
<content type='text'>
commit a1279ef74eeeb5f627f091c71d80dd7ac766c99d upstream.

Commit e0429362ab15
("usb: Add device quirk for Logitech HD Pro Webcams C920 and C930e")
introduced quirk to workaround an issue with some Logitech webcams.

Apparently model C920-C has the same issue so applying
the same quirk as well.

See aforementioned commit message for detailed explanation of the problem.

Signed-off-by: Dmitry Fleytman &lt;dmitry@daynix.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
commit a1279ef74eeeb5f627f091c71d80dd7ac766c99d upstream.

Commit e0429362ab15
("usb: Add device quirk for Logitech HD Pro Webcams C920 and C930e")
introduced quirk to workaround an issue with some Logitech webcams.

Apparently model C920-C has the same issue so applying
the same quirk as well.

See aforementioned commit message for detailed explanation of the problem.

Signed-off-by: Dmitry Fleytman &lt;dmitry@daynix.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</pre>
</div>
</content>
</entry>
<entry>
<title>usb: quirks: add delay init quirk for Corsair Strafe RGB keyboard</title>
<updated>2017-09-13T21:03:45+00:00</updated>
<author>
<name>Kai-Heng Feng</name>
<email>kai.heng.feng@canonical.com</email>
</author>
<published>2017-08-16T02:53:20+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=d70662e5a2e171af0dd7f0f210673ca9a7617e50'/>
<id>d70662e5a2e171af0dd7f0f210673ca9a7617e50</id>
<content type='text'>
commit de3af5bf259d7a0bfaac70441c8568ab5998d80c upstream.

Corsair Strafe RGB keyboard has trouble to initialize:

[ 1.679455] usb 3-6: new full-speed USB device number 4 using xhci_hcd
[ 6.871136] usb 3-6: unable to read config index 0 descriptor/all
[ 6.871138] usb 3-6: can't read configurations, error -110
[ 6.991019] usb 3-6: new full-speed USB device number 5 using xhci_hcd
[ 12.246642] usb 3-6: unable to read config index 0 descriptor/all
[ 12.246644] usb 3-6: can't read configurations, error -110
[ 12.366555] usb 3-6: new full-speed USB device number 6 using xhci_hcd
[ 17.622145] usb 3-6: unable to read config index 0 descriptor/all
[ 17.622147] usb 3-6: can't read configurations, error -110
[ 17.742093] usb 3-6: new full-speed USB device number 7 using xhci_hcd
[ 22.997715] usb 3-6: unable to read config index 0 descriptor/all
[ 22.997716] usb 3-6: can't read configurations, error -110

Although it may work after several times unpluging/pluging:

[ 68.195240] usb 3-6: new full-speed USB device number 11 using xhci_hcd
[ 68.337459] usb 3-6: New USB device found, idVendor=1b1c, idProduct=1b20
[ 68.337463] usb 3-6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 68.337466] usb 3-6: Product: Corsair STRAFE RGB Gaming Keyboard
[ 68.337468] usb 3-6: Manufacturer: Corsair
[ 68.337470] usb 3-6: SerialNumber: 0F013021AEB8046755A93ED3F5001941

Tried three quirks: USB_QUIRK_DELAY_INIT, USB_QUIRK_NO_LPM and
USB_QUIRK_DEVICE_QUALIFIER, user confirmed that USB_QUIRK_DELAY_INIT alone
can workaround this issue. Hence add the quirk for Corsair Strafe RGB.

BugLink: https://bugs.launchpad.net/bugs/1678477
Signed-off-by: Kai-Heng Feng &lt;kai.heng.feng@canonical.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
commit de3af5bf259d7a0bfaac70441c8568ab5998d80c upstream.

Corsair Strafe RGB keyboard has trouble to initialize:

[ 1.679455] usb 3-6: new full-speed USB device number 4 using xhci_hcd
[ 6.871136] usb 3-6: unable to read config index 0 descriptor/all
[ 6.871138] usb 3-6: can't read configurations, error -110
[ 6.991019] usb 3-6: new full-speed USB device number 5 using xhci_hcd
[ 12.246642] usb 3-6: unable to read config index 0 descriptor/all
[ 12.246644] usb 3-6: can't read configurations, error -110
[ 12.366555] usb 3-6: new full-speed USB device number 6 using xhci_hcd
[ 17.622145] usb 3-6: unable to read config index 0 descriptor/all
[ 17.622147] usb 3-6: can't read configurations, error -110
[ 17.742093] usb 3-6: new full-speed USB device number 7 using xhci_hcd
[ 22.997715] usb 3-6: unable to read config index 0 descriptor/all
[ 22.997716] usb 3-6: can't read configurations, error -110

Although it may work after several times unpluging/pluging:

[ 68.195240] usb 3-6: new full-speed USB device number 11 using xhci_hcd
[ 68.337459] usb 3-6: New USB device found, idVendor=1b1c, idProduct=1b20
[ 68.337463] usb 3-6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 68.337466] usb 3-6: Product: Corsair STRAFE RGB Gaming Keyboard
[ 68.337468] usb 3-6: Manufacturer: Corsair
[ 68.337470] usb 3-6: SerialNumber: 0F013021AEB8046755A93ED3F5001941

Tried three quirks: USB_QUIRK_DELAY_INIT, USB_QUIRK_NO_LPM and
USB_QUIRK_DEVICE_QUALIFIER, user confirmed that USB_QUIRK_DELAY_INIT alone
can workaround this issue. Hence add the quirk for Corsair Strafe RGB.

BugLink: https://bugs.launchpad.net/bugs/1678477
Signed-off-by: Kai-Heng Feng &lt;kai.heng.feng@canonical.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;

</pre>
</div>
</content>
</entry>
</feed>
