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Date:   Thu, 12 May 2022 15:13:24 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+b3b5c64f4880403edd36@...kaller.appspotmail.com>
Cc:     andriin@...com, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, davem@...emloft.net, edumazet@...gle.com,
        fw@...len.de, harshit.m.mogalapalli@...cle.com, hawk@...nel.org,
        jiri@...lanox.com, john.fastabend@...il.com, kafai@...com,
        kpsingh@...omium.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        roopa@...ulusnetworks.com, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, yajun.deng@...ux.dev, yhs@...com
Subject: Re: [syzbot] WARNING in rtnl_dellink

On Sat, 12 Feb 2022 at 04:24, syzbot
<syzbot+b3b5c64f4880403edd36@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit f123cffdd8fe8ea6c7fded4b88516a42798797d0
> Author: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
> Date:   Mon Nov 29 17:53:27 2021 +0000
>
>     net: netlink: af_netlink: Prevent empty skb by adding a check on len.
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=107b5472700000
> start commit:   cd02217a5d81 Merge tag 'for-linus' of git://git.kernel.org..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a0437fdd630bee11
> dashboard link: https://syzkaller.appspot.com/bug?extid=b3b5c64f4880403edd36
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=116f8172900000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1145d1b1900000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: net: netlink: af_netlink: Prevent empty skb by adding a check on len.

#syz fix: net: netlink: af_netlink: Prevent empty skb by adding a check on len.

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