iwl4965: fix skb usage after free

[pandora-kernel.git] / drivers / net / wireless / iwlegacy / iwl-4965-tx.c

diff --git a/drivers/net/wireless/iwlegacy/iwl-4965-tx.c b/drivers/net/wireless/iwlegacy/iwl-4965-tx.c
index 5c40502..fbec88d 100644 (file)
--- a/drivers/net/wireless/iwlegacy/iwl-4965-tx.c
+++ b/drivers/net/wireless/iwlegacy/iwl-4965-tx.c
@@ -1127,12 +1127,16 @@ int iwl4965_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index)
             q->read_ptr = iwl_legacy_queue_inc_wrap(q->read_ptr, q->n_bd)) {
 
                tx_info = &txq->txb[txq->q.read_ptr];
-               iwl4965_tx_status(priv, tx_info,
-                                txq_id >= IWL4965_FIRST_AMPDU_QUEUE);
+
+               if (WARN_ON_ONCE(tx_info->skb == NULL))
+                       continue;
 
                hdr = (struct ieee80211_hdr *)tx_info->skb->data;
-               if (hdr && ieee80211_is_data_qos(hdr->frame_control))
+               if (ieee80211_is_data_qos(hdr->frame_control))
                        nfreed++;
+
+               iwl4965_tx_status(priv, tx_info,
+                                txq_id >= IWL4965_FIRST_AMPDU_QUEUE);
                tx_info->skb = NULL;
 
                priv->cfg->ops->lib->txq_free_tfd(priv, txq);