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

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Date: Fri, 12 Jan 2024 16:50:31 -0800
From: Eric Biggers <ebiggers@...nel.org>
To: syzbot <syzbot+8f477ac014ff5b32d81f@...kaller.appspotmail.com>
Cc: chao@...nel.org, 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
 kill_f2fs_super

On Fri, Jan 12, 2024 at 04:32:21PM -0800, syzbot wrote:
> loop0: detected capacity change from 0 to 63271
> F2FS-fs (loop0): Mismatch start address, segment0(512) cp_blkaddr(605)
> F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock
> F2FS-fs (loop0): invalid crc value
> F2FS-fs (loop0): SIT is corrupted node# 0 vs 1
> F2FS-fs (loop0): Failed to initialize F2FS segment manager (-117)
> ==================================================================
> BUG: KASAN: slab-use-after-free in destroy_device_list fs/f2fs/super.c:1606 [inline]
> BUG: KASAN: slab-use-after-free in kill_f2fs_super+0x618/0x690 fs/f2fs/super.c:4932
> Read of size 4 at addr ffff888023bdd77c by task syz-executor275/5046

Sorry, this is my fault.  I'll fix this.

- Eric