Re: [syzbot] [ext4?] KASAN: out-of-bounds Read in ext4_ext_remove_space

[Jan Kara]

On Sun 11-02-24 05:54:02, syzbot wrote:
> syzbot suspects this issue was fixed by commit:
> 
> commit 6f861765464f43a71462d52026fbddfc858239a5
> Author: Jan Kara <jack@xxxxxxx>
> Date:   Wed Nov 1 17:43:10 2023 +0000
> 
>     fs: Block writes to mounted block devices
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1764f648180000
> start commit:   e6fda526d9db Merge tag 'arm64-fixes' of git://git.kernel.o..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=1e3d5175079af5a4
> dashboard link: https://syzkaller.appspot.com/bug?extid=6e5f2db05775244c73b7
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16a56679a80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14d76b5da80000
> 
> If the result looks correct, please mark the issue as fixed by replying with:

Yes, the reproducer seems to be corrupting the image:
 
#syz fix: fs: Block writes to mounted block devices

								Honza
-- 
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR