wifi: cfg80211: don't allow multi-BSSID in S1G

stable inclusion
from stable-v5.10.158
commit e2ed90fd3ae023a8c15a59c145d8db41ed6bbbd5
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7NTXH

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e2ed90fd3ae023a8c15a59c145d8db41ed6bbbd5

--------------------------------

[ Upstream commit acd3c92a ]

In S1G beacon frames there shouldn't be multi-BSSID elements
since that's not supported, remove that to avoid a potential
integer underflow and/or misparsing the frames due to the
different length of the fixed part of the frame.

While at it, initialize non_tx_data so we don't send garbage
values to the user (even if it doesn't seem to matter now.)
Reported-and-tested-by: NSönke Huster <shuster@seemoo.tu-darmstadt.de>
Fixes: 9eaffe50 ("cfg80211: convert S1G beacon to scan results")
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: Nsanglipeng <sanglipeng1@jd.com>

net/wireless/scan.c

@@ -2467,10 +2467,15 @@ cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
 	const struct cfg80211_bss_ies *ies1, *ies2;
 	size_t ielen = len - offsetof(struct ieee80211_mgmt,
 				      u.probe_resp.variable);
-	struct cfg80211_non_tx_bss non_tx_data;
+	struct cfg80211_non_tx_bss non_tx_data = {};
 
 	res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
 						    len, gfp);
+
+	/* don't do any further MBSSID handling for S1G */
+	if (ieee80211_is_s1g_beacon(mgmt->frame_control))
+		return res;
+
 	if (!res || !wiphy->support_mbssid ||
 	    !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
 		return res;