linux-ext4 - BUG? a suspected race bug at ext3_xattr_block

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Date:	Tue, 24 Nov 2009 20:27:41 +0900
From:	홍신 shin hong <hongshin@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: BUG? a suspected race bug at ext3_xattr_block_set()

Hello.
I am reporting a suspected data race bug from ext3/xattr.c in Linux 2.6.31.

In ext3_xattr_block_set(), it accesses bs->bh->b_data
while it does not hold lock_buffer(bs->bh).

However, there is no lock_buffer(bs->bh) and unlock_buffer(bs->bh)
for guarding the access (at line 794).

Due to the lack of synchronization, it seems that data race on
bs->bh->b_data might be possible.

Please examine the code to check whether it is problematic or not.
Thank you.

Sincerely
Shin Hong
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