linux-ext4 - Re: [PATCH v3 1/5] ext4: fix memory leak in parse_apply_sb_mount

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Date:   Wed, 18 May 2022 22:10:37 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-fscrypt@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        Jeff Layton <jlayton@...nel.org>,
        Lukas Czerner <lczerner@...hat.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>, stable@...r.kernel.org
Subject: Re: [PATCH v3 1/5] ext4: fix memory leak in
 parse_apply_sb_mount_options()

On Fri, May 13, 2022 at 04:16:01PM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> If processing the on-disk mount options fails after any memory was
> allocated in the ext4_fs_context, e.g. s_qf_names, then this memory is
> leaked.  Fix this by calling ext4_fc_free() instead of kfree() directly.
> 
> Reproducer:
> 
>     mkfs.ext4 -F /dev/vdc
>     tune2fs /dev/vdc -E mount_opts=usrjquota=file
>     echo clear > /sys/kernel/debug/kmemleak
>     mount /dev/vdc /vdc
>     echo scan > /sys/kernel/debug/kmemleak
>     sleep 5
>     echo scan > /sys/kernel/debug/kmemleak
>     cat /sys/kernel/debug/kmemleak
> 
> Fixes: 7edfd85b1ffd ("ext4: Completely separate options parsing and sb setup")
> Cc: stable@...r.kernel.org
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>

Thanks, applied.

					- Ted