linux-kernel - Re: [fs/bfs 1/2] bfs: fix null-ptr-deref in bfs_move

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Message-ID: <eb0374b3-d040-4263-96c8-d0dce88432d6@web.de>
Date: Thu, 11 Jul 2024 08:00:15 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Василий Ковалев
 <kovalevvv@...ealt.ru>, linux-fsdevel@...r.kernel.org,
 lvc-patches@...uxtesting.org,
 syzbot+d98fd19acd08b36ff422@...kaller.appspotmail.com
Cc: stable@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
 "Tigran A. Aivazian" <aivazian.tigran@...il.com>, dutyrok@...linux.org
Subject: Re: [fs/bfs 1/2] bfs: fix null-ptr-deref in bfs_move_block

> Add a check to ensure that a sb_getblk() call did not return NULL before copying data.

How do you think about another refinement for such a change description?

   Detect a failed sb_getblk() call (before copying data)
   so that null pointer dereferences should not happen any more.

Regards,
Markus