linux-kernel - Re: [syzbot] KASAN: slab-out-of-bounds Read in squashfs_get

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Message-ID: <CACT4Y+bH5vx_0wrFZiNWGLrX04Od0=iw+XU0ULC5a9Nh=qCQZw@mail.gmail.com>
Date:   Thu, 11 Mar 2021 16:04:19 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+8e28bba73ed1772a6802@...kaller.appspotmail.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Fox Chen <foxhlchen@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>, phillip@...ashfs.org.uk,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [syzbot] KASAN: slab-out-of-bounds Read in squashfs_get_id

On Thu, Mar 11, 2021 at 12:23 PM syzbot
<syzbot+8e28bba73ed1772a6802@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit e812cbbbbbb15adbbbee176baa1e8bda53059bf0
> Author: Phillip Lougher <phillip@...ashfs.org.uk>
> 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