diff options
author | Ming Lei <tom.leiming@gmail.com> | 2012-04-26 11:33:46 +0800 |
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committer | David S. Miller <davem@davemloft.net> | 2012-05-15 13:41:42 -0400 |
commit | 5b6e9bcdeb65634b4ad604eb4536404bbfc62cfa (patch) | |
tree | 9c758413d018351b2e95942314a1fa973d7fd882 /scripts/cleanfile | |
parent | 8aa51d64c1f526e43b1e7f89fb8b98c2fd583f4b (diff) |
usbnet: fix skb traversing races during unlink(v2)
Commit 4231d47e6fe69f061f96c98c30eaf9fb4c14b96d(net/usbnet: avoid
recursive locking in usbnet_stop()) fixes the recursive locking
problem by releasing the skb queue lock before unlink, but may
cause skb traversing races:
- after URB is unlinked and the queue lock is released,
the refered skb and skb->next may be moved to done queue,
even be released
- in skb_queue_walk_safe, the next skb is still obtained
by next pointer of the last skb
- so maybe trigger oops or other problems
This patch extends the usage of entry->state to describe 'start_unlink'
state, so always holding the queue(rx/tx) lock to change the state if
the referd skb is in rx or tx queue because we need to know if the
refered urb has been started unlinking in unlink_urbs.
The other part of this patch is based on Huajun's patch:
always traverse from head of the tx/rx queue to get skb which is
to be unlinked but not been started unlinking.
Signed-off-by: Huajun Li <huajun.li.lee@gmail.com>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Cc: Oliver Neukum <oneukum@suse.de>
Cc: stable@kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'scripts/cleanfile')
0 files changed, 0 insertions, 0 deletions