linux-kernel - Re: [syzbot] [ext4?] KASAN: use-after-free Read in ext4_find

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Message-ID: <20230629031852.GH8954@mit.edu>
Date:   Wed, 28 Jun 2023 23:18:52 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     syzbot <syzbot+7ec4ebe875a7076ebb31@...kaller.appspotmail.com>
Cc:     adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ext4?] KASAN: use-after-free Read in ext4_find_extent
 (3)

#syz set prio: low

On Tue, Jun 27, 2023 at 09:16:56AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    8a28a0b6f1a1 Merge tag 'net-6.4-rc8' of git://git.kernel.o..
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=12f5b40b280000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=e74b395fe4978721
> dashboard link: https://syzkaller.appspot.com/bug?extid=7ec4ebe875a7076ebb31
> compiler:       Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15a2b5c0a80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1181c5c0a80000

This report is via writing to the block device, while the file system
is mounted.

     	       		 	 	    - Ted