diff options
| author | tom.leiming@gmail.com <tom.leiming@gmail.com> | 2012-03-22 03:22:18 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-03-22 23:32:34 (GMT) |
| commit | 0956a8c20b23d429e79ff86d4325583fc06f9eb4 (patch) | |
| tree | 65adc5a7fc8b19ca046ba661692a75a65fd04e88 /drivers/char/misc.c | |
| parent | 1265fd616782ef03b98fd19f65c2b47fcd4ea11f (diff) | |
| download | linux-fsl-qoriq-0956a8c20b23d429e79ff86d4325583fc06f9eb4.tar.xz | |
usbnet: increase URB reference count before usb_unlink_urb
Commit 4231d47e6fe69f061f96c98c30eaf9fb4c14b96d(net/usbnet: avoid
recursive locking in usbnet_stop()) fixes the recursive locking
problem by releasing the skb queue lock, but it makes usb_unlink_urb
racing with defer_bh, and the URB to being unlinked may be freed before
or during calling usb_unlink_urb, so use-after-free problem may be
triggerd inside usb_unlink_urb.
The patch fixes the use-after-free problem by increasing URB
reference count with skb queue lock held before calling
usb_unlink_urb, so the URB won't be freed until return from
usb_unlink_urb.
Cc: stable@kernel.org
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Oliver Neukum <oliver@neukum.org>
Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/char/misc.c')
0 files changed, 0 insertions, 0 deletions