linux-ext4 - Re: [PATCH 1/2] jbd/jbd2: validate sb->s_first in journal_get

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Date:	Tue, 1 Nov 2011 19:06:42 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Eryu Guan <guaneryu@...il.com>
Cc:	linux-ext4@...r.kernel.org, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH 1/2] jbd/jbd2: validate sb->s_first in
 journal_get_superblock()

On Tue, Nov 01, 2011 at 10:05:03AM +0800, Eryu Guan wrote:
> I hit a J_ASSERT(blocknr != 0) failure in cleanup_journal_tail() when
> mounting a fsfuzzed ext3 image. It turns out that the corrupted ext3
> image has s_first = 0 in journal superblock, and the 0 is passed to
> journal->j_head in journal_reset(), then to blocknr in
> cleanup_journal_tail(), in the end the J_ASSERT failed.
> 
> So validate s_first after reading journal superblock from disk in
> journal_get_superblock() to ensure s_first is valid.
>
> ...
> 
> Signed-off-by: Eryu Guan <guaneryu@...il.com>

Thanks, applied.  (I took the jbd fixup as well, since it's obvious)

					- Ted
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