linux-kernel - [PATCH AUTOSEL 6.1 31/49] wifi: iwlwifi: mvm: fix ptk

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Message-Id: <20230504194626.3807438-31-sashal@kernel.org>
Date:   Thu,  4 May 2023 15:46:08 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Johannes Berg <johannes.berg@...el.com>,
        Gregory Greenman <gregory.greenman@...el.com>,
        Sasha Levin <sashal@...nel.org>, kvalo@...nel.org,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, miriam.rachel.korenblit@...el.com,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 31/49] wifi: iwlwifi: mvm: fix ptk_pn memory leak

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

[ Upstream commit d066a530af8e1833c7ea2cef7784004700c85f79 ]

If adding a key to firmware fails we leak the allocated ptk_pn.
This shouldn't happen in practice, but we should still fix it.

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Gregory Greenman <gregory.greenman@...el.com>
Link: https://lore.kernel.org/r/20230414130637.99446ffd02bc.I82a2ad6ec1395f188e0a1677cc619e3fcb1feac9@changeid
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index a841268e0709f..801098c5183b6 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -3445,7 +3445,7 @@ static int __iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 	struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 	struct iwl_mvm_sta *mvmsta = NULL;
-	struct iwl_mvm_key_pn *ptk_pn;
+	struct iwl_mvm_key_pn *ptk_pn = NULL;
 	int keyidx = key->keyidx;
 	int ret, i;
 	u8 key_offset;
@@ -3590,6 +3590,10 @@ static int __iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
 		if (ret) {
 			IWL_WARN(mvm, "set key failed\n");
 			key->hw_key_idx = STA_KEY_IDX_INVALID;
+			if (ptk_pn) {
+				RCU_INIT_POINTER(mvmsta->ptk_pn[keyidx], NULL);
+				kfree(ptk_pn);
+			}
 			/*
 			 * can't add key for RX, but we don't need it
 			 * in the device for TX so still return 0,
-- 
2.39.2