From: Christoph Hellwig <hch@infradead.org>
To: 李天宇 <lty218@stu.pku.edu.cn>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
linux-xfs <linux-xfs@vger.kernel.org>, cem <cem@kernel.org>
Subject: Re: [BUG] xfs: NULL pointer dereference in xfs_buf.h: xfs_buf_daddr()
Date: Tue, 18 Nov 2025 22:06:49 -0800 [thread overview]
Message-ID: <aR1eeeCKE4AJSKwL@infradead.org> (raw)
In-Reply-To: <AA6A7gB4JrG-pMrNGmqTzap7.1.1763463974419.Hmail.2200013188@stu.pku.edu.cn>
On Tue, Nov 18, 2025 at 07:06:14PM +0800, 李天宇 wrote:
> The kernel reports a kernel NULL pointer dereference when the sys_mount is called. This is triggered by the statement b_maps[0], where b_maps is NULL.
>
> This bug was discovered through a fuzzing framework on Linux v6.2
Linux 6.2 is ancient (Feb 2023), and the buffer cache code has seen a
major rewrite since:
ch@brick:~/work/linux$ git diff v6.2..HEAD fs/xfs/xfs_buf.[ch] | diffstat
xfs_buf.c | 1651 +++++++++++++++++++++++++++++++++++++++-----------------------------------------------------
xfs_buf.h | 96 +++--
2 files changed, 768 insertions(+), 979 deletions(-)
hch@brick:~/work/linux$ wc -l fs/xfs/xfs_buf.[ch]
2132 fs/xfs/xfs_buf.c
391 fs/xfs/xfs_buf.h
2523 total
so I'm not sure how relevant this report is, especially without a good
report.
next prev parent reply other threads:[~2025-11-19 6:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-18 11:06 [BUG] xfs: NULL pointer dereference in xfs_buf.h: xfs_buf_daddr() 李天宇
2025-11-19 6:06 ` Christoph Hellwig [this message]
2025-11-19 6:41 ` Dave Chinner
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