linux-kernel - Re: [PATCH v2] ext4: fix slab-use-after-free in ext4_es_insert

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Message-Id: <169285281339.4146427.8917376304564037982.b4-ty@mit.edu>
Date:   Thu, 24 Aug 2023 00:53:41 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     linux-ext4@...r.kernel.org, Baokun Li <libaokun1@...wei.com>
Cc:     "Theodore Ts'o" <tytso@....edu>, adilger.kernel@...ger.ca,
        jack@...e.cz, ritesh.list@...il.com, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com, yangerkun@...wei.com, yukuai3@...wei.com,
        Yikebaer Aizezi <yikebaer61@...il.com>
Subject: Re: [PATCH v2] ext4: fix slab-use-after-free in ext4_es_insert_extent()


On Tue, 15 Aug 2023 15:08:08 +0800, Baokun Li wrote:
> Yikebaer reported an issue:
> ==================================================================
> BUG: KASAN: slab-use-after-free in ext4_es_insert_extent+0xc68/0xcb0
> fs/ext4/extents_status.c:894
> Read of size 4 at addr ffff888112ecc1a4 by task syz-executor/8438
> 
> CPU: 1 PID: 8438 Comm: syz-executor Not tainted 6.5.0-rc5 #1
> Call Trace:
>  [...]
>  kasan_report+0xba/0xf0 mm/kasan/report.c:588
>  ext4_es_insert_extent+0xc68/0xcb0 fs/ext4/extents_status.c:894
>  ext4_map_blocks+0x92a/0x16f0 fs/ext4/inode.c:680
>  ext4_alloc_file_blocks.isra.0+0x2df/0xb70 fs/ext4/extents.c:4462
>  ext4_zero_range fs/ext4/extents.c:4622 [inline]
>  ext4_fallocate+0x251c/0x3ce0 fs/ext4/extents.c:4721
>  [...]
> 
> [...]

Applied, thanks!

[1/1] ext4: fix slab-use-after-free in ext4_es_insert_extent()
      commit: 91c66ddfd2dfa4c622c45a3ed0908b36c1adfa28

Best regards,
-- 
Theodore Ts'o <tytso@....edu>