linux-ext4 - Re: [bug report] ext4: Fix possible corruption when moving a directory

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Message-ID: <20230320110329.ckxg5mrenwfo5f4c@quack3>
Date:   Mon, 20 Mar 2023 12:03:29 +0100
From:   Jan Kara <jack@...e.cz>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Jan Kara <jack@...e.cz>, Eric Biggers <ebiggers@...nel.org>,
        Dan Carpenter <error27@...il.com>, linux-ext4@...r.kernel.org
Subject: Re: [bug report] ext4: Fix possible corruption when moving a
 directory

On Fri 17-03-23 22:07:43, Theodore Ts'o wrote:
> On Wed, Mar 08, 2023 at 11:42:34AM +0100, Jan Kara wrote:
> > > That analysis looks correct.  FYI, I think this is the same as the syzbot report
> > > "[ext4?] WARNING: bad unlock balance in ext4_rename2"
> > > (https://lore.kernel.org/linux-ext4/000000000000435c6905f639ae8e@google.com).
> > 
> > Good spotting! This should be fixed (along with the lock ordering problem)
> > by 3c92792da8506 ("ext4: Fix deadlock during directory rename") Ted has
> > just merged couple hours ago.
> 
> Unfortunately, the Syzkaller report is still triggering after the
> merge and commit 3c92792da8506.  The double unlock is still there, and
> so the following fix is still needed (which I will be sending to Linus).

Bah, right. Thanks for fixing this!

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR