netdev - [PATCH AUTOSEL 6.2 21/45] wifi: mac80211: check basic rates validity

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Message-Id: <20230322195639.1995821-21-sashal@kernel.org>
Date:   Wed, 22 Mar 2023 15:56:15 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <sashal@...nel.org>, johannes@...solutions.net,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 6.2 21/45] wifi: mac80211: check basic rates validity

From: Johannes Berg <johannes.berg@...el.com>

[ Upstream commit ce04abc3fcc62cd5640af981ebfd7c4dc3bded28 ]

When userspace sets basic rates, it might send us some rates
list that's empty or consists of invalid values only. We're
currently ignoring invalid values and then may end up with a
rates bitmap that's empty, which later results in a warning.

Reject the call if there were no valid rates.

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/mac80211/cfg.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index d611e15301839..e24d2d5b04ad0 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -2576,6 +2576,17 @@ static int ieee80211_change_bss(struct wiphy *wiphy,
 	if (!sband)
 		return -EINVAL;
 
+	if (params->basic_rates) {
+		if (!ieee80211_parse_bitrates(link->conf->chandef.width,
+					      wiphy->bands[sband->band],
+					      params->basic_rates,
+					      params->basic_rates_len,
+					      &link->conf->basic_rates))
+			return -EINVAL;
+		changed |= BSS_CHANGED_BASIC_RATES;
+		ieee80211_check_rate_mask(link);
+	}
+
 	if (params->use_cts_prot >= 0) {
 		link->conf->use_cts_prot = params->use_cts_prot;
 		changed |= BSS_CHANGED_ERP_CTS_PROT;
@@ -2597,16 +2608,6 @@ static int ieee80211_change_bss(struct wiphy *wiphy,
 		changed |= BSS_CHANGED_ERP_SLOT;
 	}
 
-	if (params->basic_rates) {
-		ieee80211_parse_bitrates(link->conf->chandef.width,
-					 wiphy->bands[sband->band],
-					 params->basic_rates,
-					 params->basic_rates_len,
-					 &link->conf->basic_rates);
-		changed |= BSS_CHANGED_BASIC_RATES;
-		ieee80211_check_rate_mask(link);
-	}
-
 	if (params->ap_isolate >= 0) {
 		if (params->ap_isolate)
 			sdata->flags |= IEEE80211_SDATA_DONT_BRIDGE_PACKETS;
-- 
2.39.2