From: sashiko-bot@kernel.org
To: "Jérémy Jean" <Jeremy.Jean@oss.cyber.gouv.fr>
Cc: tytso@mit.edu, linux-ext4@vger.kernel.org
Subject: Re: [PATCH] ext4: save converted extent before merging
Date: Wed, 30 Sep 2026 13:53:44 +0000 [thread overview]
Message-ID: <20260930135344.77C351F000FF@smtp.kernel.org> (raw)
In-Reply-To: <20260930134516.397754-2-Jeremy.Jean@oss.cyber.gouv.fr>
> In ext4_split_convert_extents(), merging can release the leaf holding
> the extent pointed to by ex. The later extent status cache update can
> then dereference freed memory, causing a use-after-free. KASAN reports:
>
> BUG: KASAN: use-after-free in ext4_split_convert_extents.constprop.0+0xb98/0xc80
> Read of size 2 at addr ff11000002547034 by task fixture/65
>
> Save the converted extent before merging and use the copy for the cache
> update. This also avoids using the old extent slot after a merge with
> the left neighbour.
>
> Fixes: 716b9c23b862 ("ext4: refactor split and convert extents")
> Cc: stable@kernel.org
> Assisted-by: LLM
> Signed-off-by: Jérémy Jean <Jeremy.Jean@oss.cyber.gouv.fr>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260930134516.397754-2-Jeremy.Jean@oss.cyber.gouv.fr?part=1
next prev parent reply other threads:[~2026-09-30 13:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-30 13:45 [PATCH] ext4: save converted extent before merging Jérémy Jean
2026-09-30 13:53 ` sashiko-bot [this message]
2026-10-01 6:06 ` Ojaswin Mujoo
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