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authorFelix Fietkau <nbd@openwrt.org>2012-10-08 14:39:33 +0200
committerJohn W. Linville <linville@tuxdriver.com>2012-10-08 15:06:05 -0400
commitc3e7724b6bc2f25e46c38dbe68f09d71fafeafb8 (patch)
treec53c47afd35c31d170f0c9f339178e549883c9c1 /net/mac80211/tx.c
parent5bcbc3fcbd88842765aa419934602d3930c6ed3c (diff)
downloadop-kernel-dev-c3e7724b6bc2f25e46c38dbe68f09d71fafeafb8.zip
op-kernel-dev-c3e7724b6bc2f25e46c38dbe68f09d71fafeafb8.tar.gz
mac80211: use ieee80211_free_txskb to fix possible skb leaks
A few places free skbs using dev_kfree_skb even though they're called after ieee80211_subif_start_xmit might have cloned it for tracking tx status. Use ieee80211_free_txskb here to prevent skb leaks. Signed-off-by: Felix Fietkau <nbd@openwrt.org> Cc: stable@vger.kernel.org Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/tx.c')
-rw-r--r--net/mac80211/tx.c22
1 files changed, 12 insertions, 10 deletions
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index e0e0d1d..c9bf83f 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -354,7 +354,7 @@ static void purge_old_ps_buffers(struct ieee80211_local *local)
total += skb_queue_len(&sta->ps_tx_buf[ac]);
if (skb) {
purged++;
- dev_kfree_skb(skb);
+ ieee80211_free_txskb(&local->hw, skb);
break;
}
}
@@ -466,7 +466,7 @@ ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
ps_dbg(tx->sdata,
"STA %pM TX buffer for AC %d full - dropping oldest frame\n",
sta->sta.addr, ac);
- dev_kfree_skb(old);
+ ieee80211_free_txskb(&local->hw, old);
} else
tx->local->total_ps_buffered++;
@@ -1103,7 +1103,7 @@ static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
spin_unlock(&tx->sta->lock);
if (purge_skb)
- dev_kfree_skb(purge_skb);
+ ieee80211_free_txskb(&tx->local->hw, purge_skb);
}
/* reset session timer */
@@ -1214,7 +1214,7 @@ static bool ieee80211_tx_frags(struct ieee80211_local *local,
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
if (WARN_ON_ONCE(q >= local->hw.queues)) {
__skb_unlink(skb, skbs);
- dev_kfree_skb(skb);
+ ieee80211_free_txskb(&local->hw, skb);
continue;
}
#endif
@@ -1356,7 +1356,7 @@ static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
if (unlikely(res == TX_DROP)) {
I802_DEBUG_INC(tx->local->tx_handlers_drop);
if (tx->skb)
- dev_kfree_skb(tx->skb);
+ ieee80211_free_txskb(&tx->local->hw, tx->skb);
else
__skb_queue_purge(&tx->skbs);
return -1;
@@ -1393,7 +1393,7 @@ static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
if (unlikely(res_prepare == TX_DROP)) {
- dev_kfree_skb(skb);
+ ieee80211_free_txskb(&local->hw, skb);
goto out;
} else if (unlikely(res_prepare == TX_QUEUED)) {
goto out;
@@ -1465,7 +1465,7 @@ void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
headroom = max_t(int, 0, headroom);
if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
- dev_kfree_skb(skb);
+ ieee80211_free_txskb(&local->hw, skb);
rcu_read_unlock();
return;
}
@@ -2050,8 +2050,10 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
head_need += IEEE80211_ENCRYPT_HEADROOM;
head_need += local->tx_headroom;
head_need = max_t(int, 0, head_need);
- if (ieee80211_skb_resize(sdata, skb, head_need, true))
- goto fail;
+ if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
+ ieee80211_free_txskb(&local->hw, skb);
+ return NETDEV_TX_OK;
+ }
}
if (encaps_data) {
@@ -2184,7 +2186,7 @@ void ieee80211_tx_pending(unsigned long data)
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
if (WARN_ON(!info->control.vif)) {
- kfree_skb(skb);
+ ieee80211_free_txskb(&local->hw, skb);
continue;
}
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