netdev - Re: WARNING in wiphy

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Date:   Mon, 15 Jan 2018 09:22:41 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     syzbot <syzbot+8dd9051ff19940290931@...kaller.appspotmail.com>,
        davem@...emloft.net, linux-kernel@...r.kernel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in wiphy_register

Hi syzbot maintainers,

Thanks for the report.

>   hwsim_new_radio_nl+0x5b7/0x7c0 drivers/net/wireless/mac80211_hwsim.c:3152
>   genl_family_rcv_msg+0x7b7/0xfb0 net/netlink/genetlink.c:599
>   genl_rcv_msg+0xb2/0x140 net/netlink/genetlink.c:624

You're getting into the kernel via generic netlink receive, so just as
an FYI - the generic netlink numbers aren't stable across systems, so
your reproducer has a quite good chance of not working without your
kernel .config and (virt) hardware environment.

I'll take a look at this and the rfkill one, I assume that there are
some sanity checks missing in hwsim generic netlink when it builds a
radio struct.

However, I can't really promise that I'll be able to validate the
changes against your reproducer.

johannes