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Message-ID: <20220810113551.344792-1-code@siddh.me> Date: Wed, 10 Aug 2022 17:05:51 +0530 From: Siddh Raman Pant <code@...dh.me> To: syzbot+b6c9fe29aefe68e4ad34@...kaller.appspotmail.com Cc: davem@...emloft.net, johannes@...solutions.net, kuba@...nel.org, linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org, netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: WARNING in ieee80211_ibss_csa_beacon When we are not connected to a channel, sending channel "switch" announcement doesn't make any sense. #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master --- a/net/mac80211/ibss.c +++ b/net/mac80211/ibss.c @@ -530,6 +530,10 @@ int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) sdata_assert_lock(sdata); + /* When not connected/joined, sending CSA doesn't make sense. */ + if (sdata->u.ibss.state != IEEE80211_IBSS_MLME_JOINED) + return -ENOLINK; + /* update cfg80211 bss information with the new channel */ if (!is_zero_ether_addr(ifibss->bssid)) { cbss = cfg80211_get_bss(sdata->local->hw.wiphy, -- 2.35.1
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