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Date:   Tue, 11 Oct 2022 11:38:37 -0700
From:   Tadeusz Struk <>
To:     Theodore Ts'o <>
Cc:     Andreas Dilger <>,,,,
Subject: Re: [PATCH] ext4: Add extend check to prevent BUG() in ext4_es_end

On 9/30/22 13:25, Tadeusz Struk wrote:
> Syzbot reported an issue with ext4 extents. The reproducer creates
> a corrupted ext4 fs image in memory, and mounts it as a loop device.
> It invokes the ext4_cache_extents() and ext4_find_extent(), which
> eventually triggers a BUG() in ext4_es_end() causing a kernel crash.
> It triggers on mainline, and every kernel version back to v4.14.
> Add a call ext4_ext_check_inode() in ext4_find_extent() to prevent
> the crash.
> To: "Theodore Ts'o"<>
> Cc: "Andreas Dilger"<>
> Cc:<>
> Cc:<>
> Cc:<>
> Link:
> Signed-off-by: Tadeusz Struk<>

Any comments/feedback on this one?


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