linux-kernel - [PATCH] wifi: mac80211: reject opmode notification for unsupported channel widths

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Message-ID: <20250701211105.280128-2-moonhee.lee.ca@gmail.com>
Date: Tue,  1 Jul 2025 14:11:06 -0700
From: Moon Hee Lee <moonhee.lee.ca@...il.com>
To: syzbot+ededba317ddeca8b3f08@...kaller.appspotmail.com,
	syzkaller-bugs@...glegroups.com,
	linux-kernel@...r.kernel.org
Cc: moonhee.lee.ca@...il.com
Subject: [PATCH] wifi: mac80211: reject opmode notification for unsupported channel widths

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless.git main

---
 net/mac80211/cfg.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index d9d88f2f2831..f2e96eb07e8f 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1959,6 +1959,21 @@ static int sta_link_apply_parameters(struct ieee80211_local *local,
 	ieee80211_sta_init_nss(link_sta);
 
 	if (params->opmode_notif_used) {
+		enum nl80211_chan_width width = link->conf->chanreq.oper.width;
+
+		switch (width) {
+		case NL80211_CHAN_WIDTH_20_NOHT:
+		case NL80211_CHAN_WIDTH_20:
+		case NL80211_CHAN_WIDTH_40:
+		case NL80211_CHAN_WIDTH_80:
+		case NL80211_CHAN_WIDTH_160:
+		case NL80211_CHAN_WIDTH_80P80:
+		case NL80211_CHAN_WIDTH_320:
+			break;
+		default:
+			return -EINVAL;
+		}
+
 		/* returned value is only needed for rc update, but the
 		 * rc isn't initialized here yet, so ignore it
 		 */
-- 
2.43.0