Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964994Ab2JSCtP (ORCPT ); Thu, 18 Oct 2012 22:49:15 -0400 Received: from mail.kernel.org ([198.145.19.201]:52330 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964974Ab2JSCtL (ORCPT ); Thu, 18 Oct 2012 22:49:11 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, Felix Fietkau , "John W. Linville" Subject: [ 48/76] mac80211: use ieee80211_free_txskb to fix possible skb leaks Date: Thu, 18 Oct 2012 19:47:12 -0700 Message-Id: <20121019024357.842227386@linuxfoundation.org> X-Mailer: git-send-email 1.8.0.rc0.18.gf84667d In-Reply-To: <20121019024350.087156547@linuxfoundation.org> References: <20121019024350.087156547@linuxfoundation.org> User-Agent: quilt/0.60-2.1.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4341 Lines: 135 3.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Felix Fietkau commit c3e7724b6bc2f25e46c38dbe68f09d71fafeafb8 upstream. 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 Signed-off-by: John W. Linville Signed-off-by: Greg Kroah-Hartman --- net/mac80211/status.c | 4 ++-- net/mac80211/tx.c | 22 ++++++++++++---------- 2 files changed, 14 insertions(+), 12 deletions(-) --- a/net/mac80211/status.c +++ b/net/mac80211/status.c @@ -34,7 +34,7 @@ void ieee80211_tx_status_irqsafe(struct skb_queue_len(&local->skb_queue_unreliable); while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && (skb = skb_dequeue(&local->skb_queue_unreliable))) { - dev_kfree_skb_irq(skb); + ieee80211_free_txskb(hw, skb); tmp--; I802_DEBUG_INC(local->tx_status_drop); } @@ -159,7 +159,7 @@ static void ieee80211_handle_filtered_fr "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n", skb_queue_len(&sta->tx_filtered[ac]), !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies); - dev_kfree_skb(skb); + ieee80211_free_txskb(&local->hw, skb); } static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid) --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -354,7 +354,7 @@ static void purge_old_ps_buffers(struct 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 iee 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 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 ie #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 iee 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 ieee8021 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; @@ -1466,7 +1466,7 @@ void ieee80211_xmit(struct ieee80211_sub 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; } @@ -2060,8 +2060,10 @@ netdev_tx_t ieee80211_subif_start_xmit(s 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) { @@ -2196,7 +2198,7 @@ void ieee80211_tx_pending(unsigned long 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; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/