[PATCH 1/1] wifi: mac80211: reject invalid 320 MHz CSA bandwidth

From: Ruide Cao <redacted>

The HT/VHT channel definition validator can receive a 320 MHz
bandwidth indication from a received CSA frame on a non-6 GHz link.
It warns for this unsupported width but continues with an uninitialized
vht_operation.chan_width, which is then read by
ieee80211_chandef_vht_oper(). With panic_on_warn enabled, this lets a
received frame panic the kernel.

Reject the channel definition before entering the VHT operation
conversion. This preserves the existing CSA fallback while avoiding
both the warning and the uninitialized read.

Fixes: 21c3f8f95554 ("wifi: mac80211: refactor STA CSA parsing flows")
Cc: stable@vger.kernel.org
Reported-by: Vega <redacted>
Assisted-by: LLM
Signed-off-by: Ruide Cao <redacted>
Signed-off-by: Ren Wei <redacted>
---
 net/mac80211/spectmgmt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/mac80211/spectmgmt.c b/net/mac80211/spectmgmt.c
index ec622750e1c9..a70ddb83106b 100644
--- a/net/mac80211/spectmgmt.c
+++ b/net/mac80211/spectmgmt.c

@@ -111,8 +111,8 @@ validate_chandef_by_ht_vht_oper(struct ieee80211_sub_if_data *sdata,
 
 	switch (chan_width) {
 	case NL80211_CHAN_WIDTH_320:
-		WARN_ON(1);
-		break;
+		chandef->chan = NULL;
+		return;
 	case NL80211_CHAN_WIDTH_160:
 		vht_oper.chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
 		vht_oper.center_freq_seg1_idx = vht_oper.center_freq_seg0_idx;

-- 
2.47.3