linux-kernel - Re: WARNING in ieee80211_ibss_csa

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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