rt2x00: fix regression introduced by "mac80211: free up 2 bytes in skb->cb"

The hw_key pointer is used (and obviously NULL) after skb->cb is
memset to 0. This patch grabs the iv_len before the memset call.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Stephen Blackheath <tramp.enshrine.stephen@blacksapphire.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c
index 1676ac4..451d410 100644 (file)
--- a/drivers/net/wireless/rt2x00/rt2x00queue.c
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
@@ -374,7 +374,7 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
        struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
        struct txentry_desc txdesc;
        struct skb_frame_desc *skbdesc;
-       unsigned int iv_len;
+       unsigned int iv_len = 0;
 
        if (unlikely(rt2x00queue_full(queue)))
                return -EINVAL;
@@ -395,6 +395,9 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
        entry->skb = skb;
        rt2x00queue_create_tx_descriptor(entry, &txdesc);
 
+       if (IEEE80211_SKB_CB(skb)->control.hw_key != NULL)
+               iv_len = IEEE80211_SKB_CB(skb)->control.hw_key->iv_len;
+
        /*
         * All information is retreived from the skb->cb array,
         * now we should claim ownership of the driver part of that
@@ -410,9 +413,7 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
         * the frame so we can provide it to the driver seperately.
         */
        if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
-           !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags) &&
-               (IEEE80211_SKB_CB(skb)->control.hw_key != NULL)) {
-               iv_len = IEEE80211_SKB_CB(skb)->control.hw_key->iv_len;
+           !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) {
                rt2x00crypto_tx_remove_iv(skb, iv_len);
        }