linux-kernel - Re: [syzbot] [f2fs?] KASAN: slab-use-after-free Read in kill_f2fs

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Date: Wed, 17 Jan 2024 19:59:14 -0800
From: Eric Biggers <ebiggers@...nel.org>
To: syzbot <syzbot+8f477ac014ff5b32d81f@...kaller.appspotmail.com>
Cc: chao@...nel.org, hdanton@...a.com, jaegeuk@...nel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	linux-fscrypt@...r.kernel.org, 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
 kill_f2fs_super

On Fri, Jan 12, 2024 at 10:38:04PM -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=16071613e80000
> start commit:   70d201a40823 Merge tag 'f2fs-for-6.8-rc1' of git://git.ker..
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=15071613e80000
> console output: https://syzkaller.appspot.com/x/log.txt?x=11071613e80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4607bc15d1c4bb90
> dashboard link: https://syzkaller.appspot.com/bug?extid=8f477ac014ff5b32d81f
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=112b660be80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14c1df5de80000
> 
> Reported-by: syzbot+8f477ac014ff5b32d81f@...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