netdev - Re: [syzbot] WARNING in rtnl

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Date:   Fri, 11 Feb 2022 19:24:15 -0800
From:   syzbot <syzbot+b3b5c64f4880403edd36@...kaller.appspotmail.com>
To:     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

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.

For information about bisection process see: https://goo.gl/tpsmEJ#bisection