linux-stable.git/drivers/target, branch v3.12.23

iscsi-target: Reject mutual authentication with reflected CHAP_C

2014-06-23T08:27:53+00:00

commit 1d2b60a5545942b1376cb48c1d55843d71e3a08f upstream.

This patch adds an explicit check in chap_server_compute_md5() to ensure
the CHAP_C value received from the initiator during mutual authentication
does not match the original CHAP_C provided by the target.

This is in line with RFC-3720, section 8.2.1:

   Originators MUST NOT reuse the CHAP challenge sent by the Responder
   for the other direction of a bidirectional authentication.
   Responders MUST check for this condition and close the iSCSI TCP
   connection if it occurs.

Reported-by: Tejas Vaykole 
Signed-off-by: Nicholas Bellinger 
Signed-off-by: Jiri Slaby

target: Allow READ_CAPACITY opcode in ALUA Standby access state

2014-06-20T15:34:16+00:00

commit e7810c2d2c37fa8e58dda74b00790dab60fe6fba upstream.

This patch allows READ_CAPACITY + SAI_READ_CAPACITY_16 opcode
processing to occur while the associated ALUA group is in Standby
access state.

This is required to avoid host side LUN probe failures during the
initial scan if an ALUA group has already implicitly changed into
Standby access state.

This addresses a bug reported by Chris + Philip using dm-multipath
+ ESX hosts configured with ALUA multipath.

(Drop v3.15 specific set_ascq usage - nab)

Reported-by: Chris Boot 
Reported-by: Philip Gaw 
Cc: Chris Boot 
Cc: Philip Gaw 
Cc: Hannes Reinecke 
Signed-off-by: Nicholas Bellinger 
Signed-off-by: Jiri Slaby

iser-target: Fix multi network portal shutdown regression

2014-06-20T15:34:16+00:00

commit 2363d196686e44c0158929e7cf96c8589a24a81b upstream.

This patch fixes a iser-target specific regression introduced in
v3.15-rc6 with:

commit 14f4b54fe38f3a8f8392a50b951c8aa43b63687a
Author: Sagi Grimberg 
Date:   Tue Apr 29 13:13:47 2014 +0300

    Target/iscsi,iser: Avoid accepting transport connections during stop stage

where the change to set iscsi_np->enabled = false within
iscsit_clear_tpg_np_login_thread() meant that a iscsi_np with
two iscsi_tpg_np exports would have it's parent iscsi_np set
to a disabled state, even if other iscsi_tpg_np exports still
existed.

This patch changes iscsit_clear_tpg_np_login_thread() to only
set iscsi_np->enabled = false when shutdown = true, and also
changes iscsit_del_np() to set iscsi_np->enabled = true when
iscsi_np->np_exports is non zero.

Cc: Sagi Grimberg 
Signed-off-by: Nicholas Bellinger 
Signed-off-by: Jiri Slaby

Target/iscsi,iser: Avoid accepting transport connections during stop stage

2014-06-20T15:34:15+00:00

commit 14f4b54fe38f3a8f8392a50b951c8aa43b63687a upstream.

When the target is in stop stage, iSER transport initiates RDMA disconnects.
The iSER initiator may wish to establish a new connection over the
still existing network portal. In this case iSER transport should not
accept and resume new RDMA connections. In order to learn that, iscsi_np
is added with enabled flag so the iSER transport can check when deciding
weather to accept and resume a new connection request.

The iscsi_np is enabled after successful transport setup, and disabled
before iscsi_np login threads are cleaned up.

Signed-off-by: Sagi Grimberg 
Signed-off-by: Nicholas Bellinger 
Signed-off-by: Jiri Slaby

target: Fix alua_access_state attribute OOPs for un-configured devices

2014-06-20T15:34:13+00:00

commit f1453773514bb8b0bba0716301e8c8f17f8d39c7 upstream.

This patch fixes a OOPs where an attempt to write to the per-device
alua_access_state configfs attribute at:

  /sys/kernel/config/target/core/$HBA/$DEV/alua/$TG_PT_GP/alua_access_state

results in an NULL pointer dereference when the backend device has not
yet been configured.

This patch adds an explicit check for DF_CONFIGURED, and fails with
-ENODEV to avoid this case.

Reported-by: Chris Boot 
Reported-by: Philip Gaw 
Cc: Chris Boot 
Cc: Philip Gaw 
Signed-off-by: Nicholas Bellinger 
Signed-off-by: Jiri Slaby

target: Fix NULL pointer dereference for XCOPY in target_put_sess_cmd

2014-06-20T15:33:47+00:00

commit 0ed6e189e3f6ac3a25383ed5cc8b0ac24c9b97b7 upstream.

This patch fixes a NULL pointer dereference regression bug that was
introduced with:

commit 1e1110c43b1cda9fe77fc4a04835e460550e6b3c
Author: Mikulas Patocka 
Date:   Sat May 17 06:49:22 2014 -0400

    target: fix memory leak on XCOPY

Now that target_put_sess_cmd() -> kref_put_spinlock_irqsave() is
called with a valid se_cmd->cmd_kref, a NULL pointer dereference
is triggered because the XCOPY passthrough commands don't have
an associated se_session pointer.

To address this bug, go ahead and checking for a NULL se_sess pointer
within target_put_sess_cmd(), and call se_cmd->se_tfo->release_cmd()
to release the XCOPY's xcopy_pt_cmd memory.

Reported-by: Thomas Glanzmann 
Cc: Thomas Glanzmann 
Cc: Mikulas Patocka 
Cc: stable@vger.kernel.org # 3.12+
Signed-off-by: Nicholas Bellinger 
Signed-off-by: Jiri Slaby

target: fix memory leak on XCOPY

2014-06-09T13:53:46+00:00

commit 1e1110c43b1cda9fe77fc4a04835e460550e6b3c upstream.

On each processed XCOPY command, two "kmalloc-512" memory objects are
leaked. These represent two allocations of struct xcopy_pt_cmd in
target_core_xcopy.c.

The reason for the memory leak is that the cmd_kref field is not
initialized (thus, it is zero because the allocations were done with
kzalloc). When we decrement zero kref in target_put_sess_cmd, the result
is not zero, thus target_release_cmd_kref is not called.

This patch fixes the bug by moving kref initialization from
target_get_sess_cmd to transport_init_se_cmd (this function is called from
target_core_xcopy.c, so it will correctly initialize cmd_kref). It can be
easily verified that all code that calls target_get_sess_cmd also calls
transport_init_se_cmd earlier, thus moving kref_init shouldn't introduce
any new problems.

Signed-off-by: Mikulas Patocka 
Signed-off-by: Nicholas Bellinger 
Signed-off-by: Jiri Slaby

target: Don't allow setting WC emulation if device doesn't support

2014-06-09T13:53:45+00:00

commit 07b8dae38b09bcfede7e726f172e39b5ce8390d9 upstream.

Just like for pSCSI, if the transport sets get_write_cache, then it is
not valid to enable write cache emulation for it. Return an error.

see https://bugzilla.redhat.com/show_bug.cgi?id=1082675

Reviewed-by: Chris Leech 
Signed-off-by: Andy Grover 
Signed-off-by: Nicholas Bellinger 
Signed-off-by: Jiri Slaby

iscsi-target: Change BUG_ON to REJECT in iscsit_process_nop_out

2014-06-09T13:53:44+00:00

commit 7cbfcc953789ff864c2bf8365a82a3fba4869649 upstream.

This patch changes an incorrect use of BUG_ON to instead generate a
REJECT + PROTOCOL_ERROR in iscsit_process_nop_out() code.  This case
can occur with traditional TCP where a flood of zeros in the data
stream can reach this block for what is presumed to be a NOP-OUT with
a solicited reply, but without a valid iscsi_cmd pointer.

This incorrect BUG_ON was introduced during the v3.11-rc timeframe
with the following commit:

commit 778de368964c5b7e8100cde9f549992d521e9c89
Author: Nicholas Bellinger 
Date:   Fri Jun 14 16:07:47 2013 -0700

    iscsi/isert-target: Refactor ISCSI_OP_NOOP RX handling

Reported-by: Arshad Hussain 
Signed-off-by: Nicholas Bellinger 
Signed-off-by: Jiri Slaby

target/tcm_fc: Fix use-after-free of ft_tpg

2014-05-15T07:55:19+00:00

commit 2c42be2dd4f6586728dba5c4e197afd5cfaded78 upstream.

ft_del_tpg checks tpg->tport is set before unlinking the tpg from the
tport when the tpg is being removed. Set this pointer in ft_tport_create,
or the unlinking won't happen in ft_del_tpg and tport->tpg will reference
a deleted object.

This patch sets tpg->tport in ft_tport_create, because that's what
ft_del_tpg checks, and is the only way to get back to the tport to
clear tport->tpg.

The bug was occuring when:

- lport created, tport (our per-lport, per-provider context) is
  allocated.
  tport->tpg = NULL
- tpg created
- a PRLI is received. ft_tport_create is called, tpg is found and
  tport->tpg is set
- tpg removed. ft_tpg is freed in ft_del_tpg. Since tpg->tport was not
  set, tport->tpg is not cleared and points at freed memory
- Future calls to ft_tport_create return tport via first conditional,
  instead of searching for new tpg by calling ft_lport_find_tpg.
  tport->tpg is still invalid, and will access freed memory.

see https://bugzilla.redhat.com/show_bug.cgi?id=1071340

Signed-off-by: Andy Grover 
Signed-off-by: Nicholas Bellinger 
Signed-off-by: Jiri Slaby