mac80211: fix tx->skb NULL pointer dereference

In function ieee80211_tx_h_encrypt the var info was
initialized from tx->skb, since the fucntion
is called after the function ieee80211_tx_h_fragment
tx->skb is not valid anymore.

Signed-off-by: Yoni Divinsky <yoni.divinsky@ti.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index edcd1c7..e05667c 100644 (file)
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1001,8 +1001,6 @@ ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
 static ieee80211_tx_result debug_noinline
 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
 {
-       struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
-
        if (!tx->key)
                return TX_CONTINUE;
 
@@ -1017,13 +1015,7 @@ ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
        case WLAN_CIPHER_SUITE_AES_CMAC:
                return ieee80211_crypto_aes_cmac_encrypt(tx);
        default:
-               /* handle hw-only algorithm */
-               if (info->control.hw_key) {
-                       ieee80211_tx_set_protected(tx);
-                       return TX_CONTINUE;
-               }
-               break;
-
+               return ieee80211_crypto_hw_encrypt(tx);
        }
 
        return TX_DROP;

diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index 422b798..b758350 100644 (file)
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -643,3 +643,22 @@ ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
 
        return RX_CONTINUE;
 }
+
+ieee80211_tx_result
+ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
+{
+       struct sk_buff *skb;
+       struct ieee80211_tx_info *info = NULL;
+
+       skb_queue_walk(&tx->skbs, skb) {
+               info  = IEEE80211_SKB_CB(skb);
+
+               /* handle hw-only algorithm */
+               if (!info->control.hw_key)
+                       return TX_DROP;
+       }
+
+       ieee80211_tx_set_protected(tx);
+
+       return TX_CONTINUE;
+}

diff --git a/net/mac80211/wpa.h b/net/mac80211/wpa.h
index baba060..07e33f8 100644 (file)
--- a/net/mac80211/wpa.h
+++ b/net/mac80211/wpa.h
@@ -32,5 +32,7 @@ ieee80211_tx_result
 ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx);
 ieee80211_rx_result
 ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx);
+ieee80211_tx_result
+ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx);
 
 #endif /* WPA_H */