diff options
| author | Stepan Ionichev <sozdayvek@gmail.com> | 2026-05-09 16:06:36 +0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-05-22 11:34:41 +0200 |
| commit | 5bf5e3fba9bc7dfd69701521dbe9809f8ccbdb02 (patch) | |
| tree | a8e654bbfa65e6b7df1b23ce4eb9ef8c1dfdb5a4 | |
| parent | c708d07ce70655d20350487ac2e2bc2a1f4f5038 (diff) | |
usb: gadget: goku_udc: avoid NULL deref of dev->driver in INT_USBRESET log
goku_irq() handles a number of bus events under a single ep0 path.
It already guards the gadget driver suspend/resume callbacks against a
NULL ->driver:
if (dev->gadget.speed != USB_SPEED_UNKNOWN
&& dev->driver
&& dev->driver->resume) {
spin_unlock(&dev->lock);
dev->driver->resume(&dev->gadget);
...
}
but the very next branch unconditionally dereferences dev->driver
when an INT_USBRESET arrives:
if (stat & INT_USBRESET) {
ACK(INT_USBRESET);
INFO(dev, "USB reset done, gadget %s\n",
dev->driver->driver.name);
}
If the controller raises INT_USBRESET before any gadget driver has
been bound (or after one has been unbound), dev->driver is NULL and
the printk dereferences NULL.
smatch flags the inconsistency:
drivers/usb/gadget/udc/goku_udc.c:1618 goku_irq() error:
we previously assumed 'dev->driver' could be null (see line 1607)
Fall back to a placeholder when the gadget driver is not bound.
No functional change while a gadget driver is bound.
Signed-off-by: Stepan Ionichev <sozdayvek@gmail.com>
Link: https://patch.msgid.link/20260509110636.19762-1-sozdayvek@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/gadget/udc/goku_udc.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/gadget/udc/goku_udc.c b/drivers/usb/gadget/udc/goku_udc.c index db42a5e3e805..ac2a984c2f87 100644 --- a/drivers/usb/gadget/udc/goku_udc.c +++ b/drivers/usb/gadget/udc/goku_udc.c @@ -1616,7 +1616,8 @@ pm_next: if (stat & INT_USBRESET) { /* hub reset done */ ACK(INT_USBRESET); INFO(dev, "USB reset done, gadget %s\n", - dev->driver->driver.name); + dev->driver ? dev->driver->driver.name : + "<not bound>"); } // and INT_ERR on some endpoint's crc/bitstuff/... problem } |