[PATCH] wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected

[Siddh Raman Pant <code@siddh.me>]

When we are not connected to a channel, sending channel "switch"
announcement doesn't make any sense.

The BSS list is empty in that case. This causes the for loop in
cfg80211_get_bss() to be bypassed, so the function returns NULL
(check line 1424 of net/wireless/scan.c), causing the WARN_ON()
in ieee80211_ibss_csa_beacon() to get triggered (check line 500
of net/mac80211/ibss.c), which was consequently reported on the
syzkaller dashboard.

Thus, check if we have an existing connection before generating
the CSA beacon in ieee80211_ibss_finish_csa().

Fixes: cd7760e62c2a ("mac80211: add support for CSA in IBSS mode")
Bug report: https://syzkaller.appspot.com/bug?id=05603ef4ae8926761b678d2939a3b2ad28ab9ca6
Reported-by: syzbot+b6c9fe29aefe68e4ad34@syzkaller.appspotmail.com
Cc: stable@vger.kernel.org

Signed-off-by: Siddh Raman Pant <code@siddh.me>
---
The fixes commit is old, and syzkaller shows the problem exists for
4.19 and 4.14 as well, so CC'd stable list.

 net/mac80211/ibss.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index d56890e3fabb..9b283bbc7bb4 100644
--- 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 (ifibss->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