wifi: mac80211: check S1G action frame size

[ Upstream commit 19e4a47 ]

Before checking the action code, check that it even
exists in the frame.

Reported-by: syzbot+be9c824e6f269d608288@syzkaller.appspotmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

net/mac80211/rx.c

@@ -3734,6 +3734,10 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
 			break;
 		goto queue;
 	case WLAN_CATEGORY_S1G:
+		if (len < offsetofend(typeof(*mgmt),
+				      u.action.u.s1g.action_code))
+			break;
+
 		switch (mgmt->u.action.u.s1g.action_code) {
 		case WLAN_S1G_TWT_SETUP:
 		case WLAN_S1G_TWT_TEARDOWN: