linux-kernel - Re: [PATCH v2] ext4: fix use-after-free race with debug_want_extra

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Message-ID: <20190425155745.GB4739@mit.edu>
Date:   Thu, 25 Apr 2019 11:57:45 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Barret Rhoden <brho@...gle.com>
Cc:     Andreas Dilger <adilger.kernel@...ger.ca>,
        syzbot+f584efa0ac7213c226b7@...kaller.appspotmail.com,
        Jan Kara <jack@...e.cz>, stable@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ext4: fix use-after-free race with
 debug_want_extra_isize

On Thu, Apr 18, 2019 at 11:59:37AM -0400, Barret Rhoden wrote:
> When remounting with debug_want_extra_isize, we were not performing the
> same checks that we do during a normal mount.  That allowed us to set a
> value for s_want_extra_isize that reached outside the s_inode_size.
> 
> Reported-by: syzbot+f584efa0ac7213c226b7@...kaller.appspotmail.com
> Reviewed-by: Jan Kara <jack@...e.cz>
> Signed-off-by: Barret Rhoden <brho@...gle.com>
> Cc: stable@...r.kernel.org # 4.14.111

Applied, thanks.

					- Ted