Bugzilla: 1032753
Upstream-status: 3.13

From 657eb17d87852c42b55c4b06d5425baa08b2ddb3 Mon Sep 17 00:00:00 2001
From: Mathy Vanhoef <vanhoefm@gmail.com>
Date: Thu, 28 Nov 2013 12:21:45 +0100
Subject: [PATCH] ath9k_htc: properly set MAC address and BSSID mask

Pick the MAC address of the first virtual interface as the new hardware MAC
address. Set BSSID mask according to this MAC address. This fixes CVE-2013-4579.

Signed-off-by: Mathy Vanhoef <vanhoefm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
 drivers/net/wireless/ath/ath9k/htc_drv_main.c | 25 +++++++++++++++++--------
 drivers/net/wireless/ath/ath9k/main.c         |  5 +++--
 2 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_main.c b/drivers/net/wireless/ath/ath9k/htc_drv_main.c
index 9a2657f..608d739 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_main.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_main.c
@@ -127,21 +127,26 @@ static void ath9k_htc_bssid_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
 	struct ath9k_vif_iter_data *iter_data = data;
 	int i;
 
-	for (i = 0; i < ETH_ALEN; i++)
-		iter_data->mask[i] &= ~(iter_data->hw_macaddr[i] ^ mac[i]);
+	if (iter_data->hw_macaddr != NULL) {
+		for (i = 0; i < ETH_ALEN; i++)
+			iter_data->mask[i] &= ~(iter_data->hw_macaddr[i] ^ mac[i]);
+	} else {
+		iter_data->hw_macaddr = mac;
+	}
 }
 
-static void ath9k_htc_set_bssid_mask(struct ath9k_htc_priv *priv,
+static void ath9k_htc_set_mac_bssid_mask(struct ath9k_htc_priv *priv,
 				     struct ieee80211_vif *vif)
 {
 	struct ath_common *common = ath9k_hw_common(priv->ah);
 	struct ath9k_vif_iter_data iter_data;
 
 	/*
-	 * Use the hardware MAC address as reference, the hardware uses it
-	 * together with the BSSID mask when matching addresses.
+	 * Pick the MAC address of the first interface as the new hardware
+	 * MAC address. The hardware will use it together with the BSSID mask
+	 * when matching addresses.
 	 */
-	iter_data.hw_macaddr = common->macaddr;
+	iter_data.hw_macaddr = NULL;
 	memset(&iter_data.mask, 0xff, ETH_ALEN);
 
 	if (vif)
@@ -153,6 +158,10 @@ static void ath9k_htc_set_bssid_mask(struct ath9k_htc_priv *priv,
 		ath9k_htc_bssid_iter, &iter_data);
 
 	memcpy(common->bssidmask, iter_data.mask, ETH_ALEN);
+
+	if (iter_data.hw_macaddr)
+		memcpy(common->macaddr, iter_data.hw_macaddr, ETH_ALEN);
+
 	ath_hw_setbssidmask(common);
 }
 
@@ -1063,7 +1072,7 @@ static int ath9k_htc_add_interface(struct ieee80211_hw *hw,
 		goto out;
 	}
 
-	ath9k_htc_set_bssid_mask(priv, vif);
+	ath9k_htc_set_mac_bssid_mask(priv, vif);
 
 	priv->vif_slot |= (1 << avp->index);
 	priv->nvifs++;
@@ -1128,7 +1137,7 @@ static void ath9k_htc_remove_interface(struct ieee80211_hw *hw,
 
 	ath9k_htc_set_opmode(priv);
 
-	ath9k_htc_set_bssid_mask(priv, vif);
+	ath9k_htc_set_mac_bssid_mask(priv, vif);
 
 	/*
 	 * Stop ANI only if there are no associated station interfaces.
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 74f452c..21aa09e 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -965,8 +965,9 @@ void ath9k_calculate_iter_data(struct ieee80211_hw *hw,
 	struct ath_common *common = ath9k_hw_common(ah);
 
 	/*
-	 * Use the hardware MAC address as reference, the hardware uses it
-	 * together with the BSSID mask when matching addresses.
+	 * Pick the MAC address of the first interface as the new hardware
+	 * MAC address. The hardware will use it together with the BSSID mask
+	 * when matching addresses.
 	 */
 	memset(iter_data, 0, sizeof(*iter_data));
 	memset(&iter_data->mask, 0xff, ETH_ALEN);
-- 
1.8.4.2