netdev - Re: [syzbot] WARNING in dev_change_net

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Message-ID: <CACT4Y+baaFENUbUCYq7x6aGXucyhy86Fy8UeFDHWSxDpvbda6Q@mail.gmail.com>
Date:   Thu, 19 May 2022 13:18:35 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+830c6dbfc71edc4f0b8f@...kaller.appspotmail.com>
Cc:     andriin@...com, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, davem@...emloft.net, dsahern@...il.com,
        dsahern@...nel.org, ebiederm@...ssion.com, edumazet@...gle.com,
        eric.dumazet@...il.com, fw@...len.de,
        harshit.m.mogalapalli@...cle.com, hawk@...nel.org,
        jiri@...lanox.com, johannes.berg@...el.com,
        john.fastabend@...il.com, kafai@...com, kpsingh@...omium.org,
        kuba@...nel.org, leon@...nel.org, linux-kernel@...r.kernel.org,
        marcelo.leitner@...il.com, mkubecek@...e.cz,
        netdev@...r.kernel.org, roopa@...ulusnetworks.com,
        saiprakash.ranjan@...eaurora.org, songliubraving@...com,
        suzuki.poulose@....com, syzkaller-bugs@...glegroups.com,
        tonymarislogistics@...dex.com, will@...nel.org,
        yajun.deng@...ux.dev, yhs@...com
Subject: Re: [syzbot] WARNING in dev_change_net_namespace

On Tue, 21 Dec 2021 at 21:03, syzbot
<syzbot+830c6dbfc71edc4f0b8f@...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=168acc95b00000
> start commit:   990f227371a4 Merge tag 's390-5.9-2' of git://git.kernel.or..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=21f0d1d2df6d5fc
> dashboard link: https://syzkaller.appspot.com/bug?extid=830c6dbfc71edc4f0b8f
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=101761e2900000
>
> 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.
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Looks reasonable, let's close the bug:

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