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

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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>
This commit is contained in:
Felix Fietkau 2008-10-14 23:57:43 +02:00 committed by John W. Linville
parent eaca90dab6
commit 8713a7ccd8
1 changed files with 5 additions and 4 deletions
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9
drivers/net/wireless/rt2x00/rt2x00queue.c
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@ -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);
}