linux-kernel - Re: [PATCH] jfs: validate max amount of blocks before allocation.

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Date:   Sat, 22 Jul 2023 17:16:27 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Aleksei Filippov <halip0503@...il.com>
Cc:     shaggy@...nel.org, jfs-discussion@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org,
        syzbot+5f088f29593e6b4c8db8@...kaller.appspotmail.com
Subject: Re: [PATCH] jfs: validate max amount of blocks before allocation.

On Sat, Jul 22, 2023 at 05:24:01PM +0300, Aleksei Filippov wrote:
> From: Alexei Filippov <halip0503@...il.com>
> 
> The lack of checking bmp->db_max_freebud in extBalloc() can lead to
> shift out of bounds, so this patch prevents undefined behavior,
> because bmp->db_max_freebud == -1 only if there
> is no free space.

Please wrap at 72 columns properly.


> 
> Signed-off-by: Aleksei Filippov <halip0503@...il.com>
> Reported-and-tested-by: syzbot+5f088f29593e6b4c8db8@...kaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?id=01abadbd6ae6a08b1f1987aa61554c6b3ac19ff2
> ---
>  fs/jfs/jfs_extent.c | 5 +++++
>  1 file changed, 5 insertions(+)

What commit id does this fix?

Is it needed for stable kernels?  If so, please tag it as such.

thanks,

greg k-h