netdev - BUG? racy code at net/atm/br2684.c

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Date:	Thu, 17 Feb 2011 13:49:46 +0900
From:	홍신 shin hong <hongshin@...il.com>
To:	netdev@...r.kernel.org
Subject: BUG? racy code at net/atm/br2684.c

Hi. I am reporting a suspected race bug at br2684_push()
in /net/atm/br2684.c.

Please examine the report and let me know your opinion.
I reported the same issue several month ago and got feedback
however, I found that the code is still not changed.

In br2684_push() accesses &brdev->brvcss without devs_lock holding at line 334.
But it seems that all accesses to &brdev->brvcss are synchronized by devs_lock.

So that br2684_push() may result race condition in concurrent execution
with other functions that manipulate &brdev->brvcss.

It seems that it is better to guard list_empty(&brdev->brvccs) by devs_lock.
Or check list_empty(&brdev->brvccs) once again after devs_lock holding.

Thank you.

Sincerely
Shin Hong
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