wifi: mt76: ignore key disable commands

This helps avoid cleartext leakage of already queued or powersave buffered
packets, when a reassoc triggers the key deletion.

Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230330091259.61378-1-nbd@nbd.name

drivers/net/wireless/mediatek/mt76/mt7603/main.c

@@ -512,15 +512,15 @@ mt7603_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 	    !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE))
 		return -EOPNOTSUPP;
 
-	if (cmd == SET_KEY) {
-		key->hw_key_idx = wcid->idx;
-		wcid->hw_key_idx = idx;
-	} else {
+	if (cmd != SET_KEY) {
 		if (idx == wcid->hw_key_idx)
 			wcid->hw_key_idx = -1;
 
-		key = NULL;
+		return 0;
 	}
+
+	key->hw_key_idx = wcid->idx;
+	wcid->hw_key_idx = idx;
 	mt76_wcid_key_setup(&dev->mt76, wcid, key);
 
 	return mt7603_wtbl_set_key(dev, wcid->idx, key);

drivers/net/wireless/mediatek/mt76/mt7615/mac.c

@@ -1193,8 +1193,7 @@ EXPORT_SYMBOL_GPL(mt7615_mac_enable_rtscts);
 static int
 mt7615_mac_wtbl_update_key(struct mt7615_dev *dev, struct mt76_wcid *wcid,
 			   struct ieee80211_key_conf *key,
-			   enum mt76_cipher_type cipher, u16 cipher_mask,
-			   enum set_key_cmd cmd)
+			   enum mt76_cipher_type cipher, u16 cipher_mask)
 {
 	u32 addr = mt7615_mac_wtbl_addr(dev, wcid->idx) + 30 * 4;
 	u8 data[32] = {};
@@ -1203,7 +1202,6 @@ mt7615_mac_wtbl_update_key(struct mt7615_dev *dev, struct mt76_wcid *wcid,
 		return -EINVAL;
 
 	mt76_rr_copy(dev, addr, data, sizeof(data));
-	if (cmd == SET_KEY) {
 	if (cipher == MT_CIPHER_TKIP) {
 		/* Rx/Tx MIC keys are swapped */
 		memcpy(data, key->key, 16);
@@ -1217,14 +1215,6 @@ mt7615_mac_wtbl_update_key(struct mt7615_dev *dev, struct mt76_wcid *wcid,
 		if (cipher == MT_CIPHER_BIP_CMAC_128)
 			memcpy(data + 16, key->key, 16);
 	}
-	} else {
-		if (cipher == MT_CIPHER_BIP_CMAC_128)
-			memset(data + 16, 0, 16);
-		else if (cipher_mask)
-			memset(data, 0, 16);
-		if (!cipher_mask)
-			memset(data, 0, sizeof(data));
-	}
 
 	mt76_wr_copy(dev, addr, data, sizeof(data));
 
@@ -1234,7 +1224,7 @@ mt7615_mac_wtbl_update_key(struct mt7615_dev *dev, struct mt76_wcid *wcid,
 static int
 mt7615_mac_wtbl_update_pk(struct mt7615_dev *dev, struct mt76_wcid *wcid,
 			  enum mt76_cipher_type cipher, u16 cipher_mask,
-			  int keyidx, enum set_key_cmd cmd)
+			  int keyidx)
 {
 	u32 addr = mt7615_mac_wtbl_addr(dev, wcid->idx), w0, w1;
 
@@ -1253,9 +1243,7 @@ mt7615_mac_wtbl_update_pk(struct mt7615_dev *dev, struct mt76_wcid *wcid,
 	else
 		w0 &= ~MT_WTBL_W0_RX_IK_VALID;
 
-	if (cmd == SET_KEY &&
-	    (cipher != MT_CIPHER_BIP_CMAC_128 ||
-	     cipher_mask == BIT(cipher))) {
+	if (cipher != MT_CIPHER_BIP_CMAC_128 || cipher_mask == BIT(cipher)) {
 		w0 &= ~MT_WTBL_W0_KEY_IDX;
 		w0 |= FIELD_PREP(MT_WTBL_W0_KEY_IDX, keyidx);
 	}
@@ -1272,19 +1260,10 @@ mt7615_mac_wtbl_update_pk(struct mt7615_dev *dev, struct mt76_wcid *wcid,
 
 static void
 mt7615_mac_wtbl_update_cipher(struct mt7615_dev *dev, struct mt76_wcid *wcid,
-			      enum mt76_cipher_type cipher, u16 cipher_mask,
-			      enum set_key_cmd cmd)
+			      enum mt76_cipher_type cipher, u16 cipher_mask)
 {
 	u32 addr = mt7615_mac_wtbl_addr(dev, wcid->idx);
 
-	if (!cipher_mask) {
-		mt76_clear(dev, addr + 2 * 4, MT_WTBL_W2_KEY_TYPE);
-		return;
-	}
-
-	if (cmd != SET_KEY)
-		return;
-
 	if (cipher == MT_CIPHER_BIP_CMAC_128 &&
 	    cipher_mask & ~BIT(MT_CIPHER_BIP_CMAC_128))
 		return;
@@ -1295,8 +1274,7 @@ mt7615_mac_wtbl_update_cipher(struct mt7615_dev *dev, struct mt76_wcid *wcid,
 
 int __mt7615_mac_wtbl_set_key(struct mt7615_dev *dev,
 			      struct mt76_wcid *wcid,
-			      struct ieee80211_key_conf *key,
-			      enum set_key_cmd cmd)
+			      struct ieee80211_key_conf *key)
 {
 	enum mt76_cipher_type cipher;
 	u16 cipher_mask = wcid->cipher;
@@ -1306,19 +1284,14 @@ int __mt7615_mac_wtbl_set_key(struct mt7615_dev *dev,
 	if (cipher == MT_CIPHER_NONE)
 		return -EOPNOTSUPP;
 
-	if (cmd == SET_KEY)
 	cipher_mask |= BIT(cipher);
-	else
-		cipher_mask &= ~BIT(cipher);
-
-	mt7615_mac_wtbl_update_cipher(dev, wcid, cipher, cipher_mask, cmd);
-	err = mt7615_mac_wtbl_update_key(dev, wcid, key, cipher, cipher_mask,
-					 cmd);
+	mt7615_mac_wtbl_update_cipher(dev, wcid, cipher, cipher_mask);
+	err = mt7615_mac_wtbl_update_key(dev, wcid, key, cipher, cipher_mask);
 	if (err < 0)
 		return err;
 
 	err = mt7615_mac_wtbl_update_pk(dev, wcid, cipher, cipher_mask,
-					key->keyidx, cmd);
+					key->keyidx);
 	if (err < 0)
 		return err;
 
@@ -1329,13 +1302,12 @@ int __mt7615_mac_wtbl_set_key(struct mt7615_dev *dev,
 
 int mt7615_mac_wtbl_set_key(struct mt7615_dev *dev,
 			    struct mt76_wcid *wcid,
-			    struct ieee80211_key_conf *key,
-			    enum set_key_cmd cmd)
+			    struct ieee80211_key_conf *key)
 {
 	int err;
 
 	spin_lock_bh(&dev->mt76.lock);
-	err = __mt7615_mac_wtbl_set_key(dev, wcid, key, cmd);
+	err = __mt7615_mac_wtbl_set_key(dev, wcid, key);
 	spin_unlock_bh(&dev->mt76.lock);
 
 	return err;

drivers/net/wireless/mediatek/mt76/mt7615/main.c

@@ -391,18 +391,17 @@ static int mt7615_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 
 	if (cmd == SET_KEY)
 		*wcid_keyidx = idx;
-	else if (idx == *wcid_keyidx)
+	else {
+		if (idx == *wcid_keyidx)
 			*wcid_keyidx = -1;
-	else
 		goto out;
+	}
 
-	mt76_wcid_key_setup(&dev->mt76, wcid,
-			    cmd == SET_KEY ? key : NULL);
-
+	mt76_wcid_key_setup(&dev->mt76, wcid, key);
 	if (mt76_is_mmio(&dev->mt76))
-		err = mt7615_mac_wtbl_set_key(dev, wcid, key, cmd);
+		err = mt7615_mac_wtbl_set_key(dev, wcid, key);
 	else
-		err = __mt7615_mac_wtbl_set_key(dev, wcid, key, cmd);
+		err = __mt7615_mac_wtbl_set_key(dev, wcid, key);
 
 out:
 	mt7615_mutex_release(dev);

drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h

@@ -490,11 +490,9 @@ int mt7615_mac_write_txwi(struct mt7615_dev *dev, __le32 *txwi,
 void mt7615_mac_set_timing(struct mt7615_phy *phy);
 int __mt7615_mac_wtbl_set_key(struct mt7615_dev *dev,
 			      struct mt76_wcid *wcid,
-			      struct ieee80211_key_conf *key,
-			      enum set_key_cmd cmd);
+			      struct ieee80211_key_conf *key);
 int mt7615_mac_wtbl_set_key(struct mt7615_dev *dev, struct mt76_wcid *wcid,
-			    struct ieee80211_key_conf *key,
-			    enum set_key_cmd cmd);
+			    struct ieee80211_key_conf *key);
 void mt7615_mac_reset_work(struct work_struct *work);
 u32 mt7615_mac_get_sta_tid_sn(struct mt7615_dev *dev, int wcid, u8 tid);
 

drivers/net/wireless/mediatek/mt76/mt76x02_util.c

@@ -454,20 +454,20 @@ int mt76x02_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 	msta = sta ? (struct mt76x02_sta *)sta->drv_priv : NULL;
 	wcid = msta ? &msta->wcid : &mvif->group_wcid;
 
-	if (cmd == SET_KEY) {
-		key->hw_key_idx = wcid->idx;
-		wcid->hw_key_idx = idx;
-		if (key->flags & IEEE80211_KEY_FLAG_RX_MGMT) {
-			key->flags |= IEEE80211_KEY_FLAG_SW_MGMT_TX;
-			wcid->sw_iv = true;
-		}
-	} else {
+	if (cmd != SET_KEY) {
 		if (idx == wcid->hw_key_idx) {
 			wcid->hw_key_idx = -1;
 			wcid->sw_iv = false;
 		}
 
-		key = NULL;
+		return 0;
+	}
+
+	key->hw_key_idx = wcid->idx;
+	wcid->hw_key_idx = idx;
+	if (key->flags & IEEE80211_KEY_FLAG_RX_MGMT) {
+		key->flags |= IEEE80211_KEY_FLAG_SW_MGMT_TX;
+		wcid->sw_iv = true;
 	}
 	mt76_wcid_key_setup(&dev->mt76, wcid, key);
 

drivers/net/wireless/mediatek/mt76/mt7915/main.c

@@ -410,16 +410,15 @@ static int mt7915_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 		mt7915_mcu_add_bss_info(phy, vif, true);
 	}
 
-	if (cmd == SET_KEY)
+	if (cmd == SET_KEY) {
 		*wcid_keyidx = idx;
-	else if (idx == *wcid_keyidx)
+	} else {
+		if (idx == *wcid_keyidx)
 			*wcid_keyidx = -1;
-	else
 		goto out;
+	}
 
-	mt76_wcid_key_setup(&dev->mt76, wcid,
-			    cmd == SET_KEY ? key : NULL);
-
+	mt76_wcid_key_setup(&dev->mt76, wcid, key);
 	err = mt76_connac_mcu_add_key(&dev->mt76, vif, &msta->bip,
 				      key, MCU_EXT_CMD(STA_REC_UPDATE),
 				      &msta->wcid, cmd);

drivers/net/wireless/mediatek/mt76/mt7921/main.c

@@ -569,16 +569,15 @@ static int mt7921_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 
 	mt7921_mutex_acquire(dev);
 
-	if (cmd == SET_KEY)
+	if (cmd == SET_KEY) {
 		*wcid_keyidx = idx;
-	else if (idx == *wcid_keyidx)
+	} else {
+		if (idx == *wcid_keyidx)
 			*wcid_keyidx = -1;
-	else
 		goto out;
+	}
 
-	mt76_wcid_key_setup(&dev->mt76, wcid,
-			    cmd == SET_KEY ? key : NULL);
-
+	mt76_wcid_key_setup(&dev->mt76, wcid, key);
 	err = mt76_connac_mcu_add_key(&dev->mt76, vif, &msta->bip,
 				      key, MCU_UNI_CMD(STA_REC_UPDATE),
 				      &msta->wcid, cmd);

drivers/net/wireless/mediatek/mt76/mt7996/main.c

@@ -351,16 +351,15 @@ static int mt7996_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 		mt7996_mcu_add_bss_info(phy, vif, true);
 	}
 
-	if (cmd == SET_KEY)
+	if (cmd == SET_KEY) {
 		*wcid_keyidx = idx;
-	else if (idx == *wcid_keyidx)
+	} else {
+		if (idx == *wcid_keyidx)
 			*wcid_keyidx = -1;
-	else
 		goto out;
+	}
 
-	mt76_wcid_key_setup(&dev->mt76, wcid,
-			    cmd == SET_KEY ? key : NULL);
-
+	mt76_wcid_key_setup(&dev->mt76, wcid, key);
 	err = mt7996_mcu_add_key(&dev->mt76, vif, &msta->bip,
 				 key, MCU_WMWA_UNI_CMD(STA_REC_UPDATE),
 				 &msta->wcid, cmd);