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NFC: pn533: Fix missing lock while operating on commands list 

In pn533_wq_cmd command was removed from list without cmd_lock held
(race with pn533_send_cmd_frame_async) which could lead to list
corruption. Delete command from list before releasing lock.

Signed-off-by: Szymon Janc <szymon.janc@tieto.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Szymon Janc 2012-10-25 17:29:45 +02:00 committed by Samuel Ortiz
parent 16a78e9fed
commit 60ad07ab6b
1 changed files with 2 additions and 1 deletions
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3
drivers/nfc/pn533.c
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@ -698,13 +698,14 @@ static void pn533_wq_cmd(struct work_struct *work)
cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
list_del(&cmd->queue);
mutex_unlock(&dev->cmd_lock);
__pn533_send_cmd_frame_async(dev, cmd->out_frame, cmd->in_frame,
cmd->in_frame_len, cmd->cmd_complete,
cmd->arg, cmd->flags);
list_del(&cmd->queue);
kfree(cmd);
}