linux-kernel - Re: [syzbot] [f2fs?] KASAN: slab-use-after-free Read in destroy_device

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Date: Wed, 17 Jan 2024 19:58:42 -0800
From: Eric Biggers <ebiggers@...nel.org>
To: syzbot <syzbot+a5e651ca75fa0260acd5@...kaller.appspotmail.com>
Cc: chao@...nel.org, eadavis@...com, jaegeuk@...nel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [f2fs?] KASAN: slab-use-after-free Read in
 destroy_device_list

On Sat, Jan 13, 2024 at 08:59:04PM -0800, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 275dca4630c165edea9abe27113766bc1173f878
> Author: Eric Biggers <ebiggers@...gle.com>
> Date:   Wed Dec 27 17:14:28 2023 +0000
> 
>     f2fs: move release of block devices to after kill_block_super()
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10639913e80000
> start commit:   052d534373b7 Merge tag 'exfat-for-6.8-rc1' of git://git.ke..
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=12639913e80000
> console output: https://syzkaller.appspot.com/x/log.txt?x=14639913e80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=878a2a4af11180a7
> dashboard link: https://syzkaller.appspot.com/bug?extid=a5e651ca75fa0260acd5
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=167b0f47e80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11255313e80000
> 
> Reported-by: syzbot+a5e651ca75fa0260acd5@...kaller.appspotmail.com
> Fixes: 275dca4630c1 ("f2fs: move release of block devices to after kill_block_super()")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> 

#syz fix: f2fs: fix double free of f2fs_sb_info