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libfc: Fix a race in fc_exch_timer_set_locked() 

It is allowed to pass a zero timeout value to fc_seq_exch_abort().
Avoid that this can cause the timeout function to drop the exchange
reference before it has been increased by fc_exch_timer_set_locked().
This patch fixes a crash when running FCoE target code with poisoning
enabled in the memory allocator.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Cc: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
This commit is contained in:
Bart Van Assche 2013-08-14 15:35:29 +00:00 committed by Robert Love
parent 8d08023687
commit b86788658b
1 changed files with 4 additions and 3 deletions
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7
drivers/scsi/libfc/fc_exch.c
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@ -360,9 +360,10 @@ static inline void fc_exch_timer_set_locked(struct fc_exch *ep,
FC_EXCH_DBG(ep, "Exchange timer armed : %d msecs\n", timer_msec);
if (queue_delayed_work(fc_exch_workqueue, &ep->timeout_work,
msecs_to_jiffies(timer_msec)))
fc_exch_hold(ep); /* hold for timer */
fc_exch_hold(ep); /* hold for timer */
if (!queue_delayed_work(fc_exch_workqueue, &ep->timeout_work,
msecs_to_jiffies(timer_msec)))
fc_exch_release(ep);
}
/**