From 6780f4872d60415bbf262bc84fab1ad80991d1e4 Mon Sep 17 00:00:00 2001 From: Moon Hee Lee Date: Tue, 1 Jul 2025 12:36:48 -0700 Subject: [PATCH] mac80211: reject opmode notification for unsupported channel widths VHT operating mode notification should not be applied when the channel width is 5 MHz or 10 MHz, as VHT does not support those widths. Without this check, a malformed opmode notification with 10 MHz width can reach ieee80211_chan_width_to_rx_bw(), triggering a WARN_ON due to invalid channel width. This issue was reported by syzbot. Reject unsupported channel widths early in sta_link_apply_parameters() when opmode notification is used. Signed-off-by: Moon Hee Lee --- net/mac80211/cfg.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 56540c3701ed..5a6ae093a8bd 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -1981,6 +1981,21 @@ 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