linux-kernel - [PATCH RESEND] iwlwifi: Adjust input parameter validation in iwl_sta_calc_ht

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Message-ID: <22e24ec8-283f-49e9-b7b0-555e8113c250@web.de>
Date: Mon, 3 Mar 2025 14:18:18 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: kernel-janitors@...r.kernel.org, linux-wireless@...r.kernel.org,
 netdev@...r.kernel.org, Benjamin Berg <benjamin.berg@...el.com>,
 Gregory Greenman <gregory.greenman@...el.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Johannes Berg <johannes.berg@...el.com>,
 Kalle Valo <kvalo@...nel.org>,
 Miri Korenblit <miriam.rachel.korenblit@...el.com>,
 Paolo Abeni <pabeni@...hat.com>, Sriram R <quic_srirrama@...cinc.com>
Cc: cocci@...ia.fr, LKML <linux-kernel@...r.kernel.org>,
 Simon Horman <horms@...nel.org>
Subject: [PATCH RESEND] iwlwifi: Adjust input parameter validation in
 iwl_sta_calc_ht_flags()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Wed, 19 Apr 2023 19:19:34 +0200

The address of a data structure member was determined before
a corresponding null pointer check in the implementation of
the function “iwl_sta_calc_ht_flags”.

Thus avoid the risk for undefined behaviour by moving the assignment
for the variable “sta_ht_inf” behind the null pointer check.

This issue was detected by using the Coccinelle software.

Fixes: 046d2e7c50e3 ("mac80211: prepare sta handling for MLO support")
Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/net/wireless/intel/iwlwifi/dvm/sta.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/dvm/sta.c b/drivers/net/wireless/intel/iwlwifi/dvm/sta.c
index cef43cf80620..74814ce0155e 100644
--- a/drivers/net/wireless/intel/iwlwifi/dvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/dvm/sta.c
@@ -147,7 +147,7 @@ static void iwl_sta_calc_ht_flags(struct iwl_priv *priv,
 				  struct iwl_rxon_context *ctx,
 				  __le32 *flags, __le32 *mask)
 {
-	struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->deflink.ht_cap;
+	struct ieee80211_sta_ht_cap *sta_ht_inf;

 	*mask = STA_FLG_RTS_MIMO_PROT_MSK |
 		STA_FLG_MIMO_DIS_MSK |
@@ -156,7 +156,11 @@ static void iwl_sta_calc_ht_flags(struct iwl_priv *priv,
 		STA_FLG_AGG_MPDU_DENSITY_MSK;
 	*flags = 0;

-	if (!sta || !sta_ht_inf->ht_supported)
+	if (!sta)
+		return;
+
+	sta_ht_inf = &sta->deflink.ht_cap;
+	if (!sta_ht_inf->ht_supported)
 		return;

 	IWL_DEBUG_INFO(priv, "STA %pM SM PS mode: %s\n",
--
2.40.0