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ath9k: fix a rare use-after-free bug

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SVN-Revision: 31690
This commit is contained in:
Felix Fietkau 2012-05-12 17:40:53 +00:00
parent 5cc362bd7a
commit 373d489a2c
1 changed files with 67 additions and 0 deletions
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67
package/mac80211/patches/561-ath9k_fix_tid_buffer_free.patch Normal file
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@ -0,0 +1,67 @@
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -64,7 +64,8 @@ static void ath_tx_update_baw(struct ath
static struct ath_buf *ath_tx_setup_buffer(struct ath_softc *sc,
struct ath_txq *txq,
struct ath_atx_tid *tid,
- struct sk_buff *skb);
+ struct sk_buff *skb,
+ bool dequeue);
enum {
MCS_HT20,
@@ -821,7 +822,7 @@ static enum ATH_AGGR_STATUS ath_tx_form_
fi = get_frame_info(skb);
bf = fi->bf;
if (!fi->bf)
- bf = ath_tx_setup_buffer(sc, txq, tid, skb);
+ bf = ath_tx_setup_buffer(sc, txq, tid, skb, true);
if (!bf)
continue;
@@ -1737,7 +1738,7 @@ static void ath_tx_send_ampdu(struct ath
return;
}
- bf = ath_tx_setup_buffer(sc, txctl->txq, tid, skb);
+ bf = ath_tx_setup_buffer(sc, txctl->txq, tid, skb, false);
if (!bf)
return;
@@ -1766,7 +1767,7 @@ static void ath_tx_send_normal(struct at
bf = fi->bf;
if (!bf)
- bf = ath_tx_setup_buffer(sc, txq, tid, skb);
+ bf = ath_tx_setup_buffer(sc, txq, tid, skb, false);
if (!bf)
return;
@@ -1827,7 +1828,8 @@ u8 ath_txchainmask_reduction(struct ath_
static struct ath_buf *ath_tx_setup_buffer(struct ath_softc *sc,
struct ath_txq *txq,
struct ath_atx_tid *tid,
- struct sk_buff *skb)
+ struct sk_buff *skb,
+ bool dequeue)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_frame_info *fi = get_frame_info(skb);
@@ -1876,6 +1878,8 @@ static struct ath_buf *ath_tx_setup_buff
return bf;
error:
+ if (dequeue)
+ __skb_unlink(skb, &tid->buf_q);
dev_kfree_skb_any(skb);
return NULL;
}
@@ -1895,7 +1899,7 @@ static void ath_tx_start_dma(struct ath_
*/
ath_tx_send_ampdu(sc, tid, skb, txctl);
} else {
- bf = ath_tx_setup_buffer(sc, txctl->txq, tid, skb);
+ bf = ath_tx_setup_buffer(sc, txctl->txq, tid, skb, false);
if (!bf)
return;