Re: [syzbot] KASAN: slab-out-of-bounds Read in squashfs_get_id

[Dmitry Vyukov]

On Thu, Mar 11, 2021 at 12:23 PM syzbot
<syzbot+8e28bba73ed1772a6802@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit e812cbbbbbb15adbbbee176baa1e8bda53059bf0
> Author: Phillip Lougher <phillip@xxxxxxxxxxxxxxx>
> Date:   Tue Feb 9 21:41:50 2021 +0000
>
>     squashfs: avoid out of bounds writes in decompressors
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11bfa48ad00000
> start commit:   cd796ed3 Merge tag 'trace-v5.10-rc7' of git://git.kernel.o..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=59df2a4dced5f928
> dashboard link: https://syzkaller.appspot.com/bug?extid=8e28bba73ed1772a6802
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1138f80f500000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=125e080f500000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: squashfs: avoid out of bounds writes in decompressors
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Looks reasonable:

#syz fix: squashfs: avoid out of bounds writes in decompressors