linux-kernel - [PATCH 6.12.y] wifi: mac80211: check basic rates validity in sta_link_apply

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Message-ID: <20250814054804.114024-1-hannelotta@gmail.com>
Date: Thu, 14 Aug 2025 08:48:04 +0300
From: Hanne-Lotta Mäenpää <hannelotta@...il.com>
To: stable@...r.kernel.org
Cc: johannes@...solutions.net,
	shaul.triebitz@...el.com,
	linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-kernel-mentees@...ts.linux.dev,
	skhan@...uxfoundation.org,
	david.hunter.linux@...il.com,
	Mikhail Lobanov <m.lobanov@...a.ru>,
	Johannes Berg <johannes.berg@...el.com>,
	Hanne-Lotta Mäenpää <hannelotta@...il.com>
Subject: [PATCH 6.12.y] wifi: mac80211: check basic rates validity in sta_link_apply_parameters

From: Mikhail Lobanov <m.lobanov@...a.ru>

[ Upstream commit 16ee3ea8faef8ff042acc15867a6c458c573de61 ]

When userspace sets supported rates for a new station via
NL80211_CMD_NEW_STATION, it might send a list that's empty
or contains only invalid values. Currently, we process these
values in sta_link_apply_parameters() without checking the result of
ieee80211_parse_bitrates(), which can lead to an empty rates bitmap.

A similar issue was addressed for NL80211_CMD_SET_BSS in commit
ce04abc3fcc6 ("wifi: mac80211: check basic rates validity").
This patch applies the same approach in sta_link_apply_parameters()
for NL80211_CMD_NEW_STATION, ensuring there is at least one valid
rate by inspecting the result of ieee80211_parse_bitrates().

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Fixes: b95eb7f0eee4 ("wifi: cfg80211/mac80211: separate link params from station params")
Signed-off-by: Mikhail Lobanov <m.lobanov@...a.ru>
Link: https://patch.msgid.link/20250317103139.17625-1-m.lobanov@rosa.ru
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
(cherry picked from commit 16ee3ea8faef8ff042acc15867a6c458c573de61)
Signed-off-by: Hanne-Lotta Mäenpää <hannelotta@...il.com>
---
 net/mac80211/cfg.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index cf2b8a05c338..9da17d653238 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1879,12 +1879,12 @@ static int sta_link_apply_parameters(struct ieee80211_local *local,
 	}
 
 	if (params->supported_rates &&
-	    params->supported_rates_len) {
-		ieee80211_parse_bitrates(link->conf->chanreq.oper.width,
-					 sband, params->supported_rates,
-					 params->supported_rates_len,
-					 &link_sta->pub->supp_rates[sband->band]);
-	}
+	    params->supported_rates_len &&
+	    !ieee80211_parse_bitrates(link->conf->chanreq.oper.width,
+				      sband, params->supported_rates,
+				      params->supported_rates_len,
+				      &link_sta->pub->supp_rates[sband->band]))
+		return -EINVAL;
 
 	if (params->ht_capa)
 		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
-- 
2.50.0