From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Gortmaker Subject: [PATCH net-next 12/21] tipc: Fix sk_buff leaks when link congestion is detected Date: Tue, 10 May 2011 16:44:28 -0400 Message-ID: <1305060277-15600-13-git-send-email-paul.gortmaker@windriver.com> References: <1305060277-15600-1-git-send-email-paul.gortmaker@windriver.com> Cc: netdev@vger.kernel.org, Allan.Stephens@windriver.com, Allan Stephens , Paul Gortmaker To: davem@davemloft.net Return-path: Received: from mail.windriver.com ([147.11.1.11]:52408 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752597Ab1EJUpF (ORCPT ); Tue, 10 May 2011 16:45:05 -0400 In-Reply-To: <1305060277-15600-1-git-send-email-paul.gortmaker@windriver.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Allan Stephens Modifies a TIPC send routine that did not discard the outgoing sk_buff if it was not transmitted because of link congestion; this eliminates the potential for buffer leakage in the many callers who did not clean up the unsent buffer. (The two routines that previously did discard the unsent buffer have been updated to eliminate their now-redundant clean up.) Signed-off-by: Allan Stephens Signed-off-by: Paul Gortmaker --- net/tipc/bcast.c | 4 +--- net/tipc/link.c | 7 +++---- 2 files changed, 4 insertions(+), 7 deletions(-) diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c index 08e3216..fa68d1e 100644 --- a/net/tipc/bcast.c +++ b/net/tipc/bcast.c @@ -407,9 +407,7 @@ int tipc_bclink_send_msg(struct sk_buff *buf) spin_lock_bh(&bc_lock); res = tipc_link_send_buf(bcl, buf); - if (unlikely(res == -ELINKCONG)) - buf_discard(buf); - else + if (likely(res > 0)) bclink_set_last_sent(); bcl->stats.queue_sz_counts++; diff --git a/net/tipc/link.c b/net/tipc/link.c index 02b083e..2a9f44a 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -864,8 +864,9 @@ int tipc_link_send_buf(struct link *l_ptr, struct sk_buff *buf) if (unlikely(queue_size >= queue_limit)) { if (imp <= TIPC_CRITICAL_IMPORTANCE) { - return link_schedule_port(l_ptr, msg_origport(msg), - size); + link_schedule_port(l_ptr, msg_origport(msg), size); + buf_discard(buf); + return -ELINKCONG; } buf_discard(buf); if (imp > CONN_MANAGER) { @@ -1069,8 +1070,6 @@ again: if (likely(buf)) { res = link_send_buf_fast(l_ptr, buf, &sender->max_pkt); - if (unlikely(res < 0)) - buf_discard(buf); exit: tipc_node_unlock(node); read_unlock_bh(&tipc_net_lock); -- 1.7.4.4