From: "Chen Cheng" <chencheng@fnnas.com>
To: <yukuai@fygo.io>, <nixiao@fygo.io>, <linux-raid@vger.kernel.org>
Cc: <chencheng@fnnas.com>
Subject: [PATCH v2 0/2] md/raid5: validate disk count before reshape assembly
Date: Mon, 21 Sep 2026 15:16:51 +0800 [thread overview]
Message-ID: <cover.1789974245.git.chencheng@fnnas.com> (raw)
From: Chen Cheng <chencheng@fnnas.com>
The previous patch rejects raid4/5 arrays with too few disks in
setup_conf(). During reshape assembly, raid5_run() still divides by the
data-disk count before that check, so a crafted superblock can hit
division by zero.
Extract min_raid_disks() and reject invalid reshape geometries in
raid5_run() first.
v1 -> v2:
- Added Link
Chen Cheng (2):
md/raid5: extract min_raid_disks()
md/raid5: reject invalid reshape disks in raid5_run()
drivers/md/raid5.c | 28 ++++++++++++++++++----------
1 file changed, 18 insertions(+), 10 deletions(-)
--
2.55.0
next reply other threads:[~2026-09-21 7:17 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-21 7:16 Chen Cheng [this message]
2026-09-21 7:16 ` [PATCH v2 1/2] md/raid5: extract min_raid_disks() Chen Cheng
2026-09-21 7:16 ` [PATCH v2 2/2] md/raid5: reject invalid reshape disks in raid5_run() Chen Cheng
2026-09-22 7:23 ` [PATCH v2 0/2] md/raid5: validate disk count before reshape assembly yu kuai
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