linux-kernel - Re: [syzbot] WARNING in dev_change_net

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Message-ID: <0000000000009cd20305d3ad7e8d@google.com>
Date:   Tue, 21 Dec 2021 12:03:10 -0800
From:   syzbot <syzbot+830c6dbfc71edc4f0b8f@...kaller.appspotmail.com>
To:     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,
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        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,
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        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

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