From bebc55aeffa72d8198e5c54cab9973a30e92f854 Mon Sep 17 00:00:00 2001 From: Allan Stephens Date: Tue, 19 Apr 2011 10:17:58 -0400 Subject: [PATCH] tipc: Fix sk_buff leaks when link congestion is detected 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 08e3216a33d2..fa68d1e9ff4b 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 02b083e5c219..2a9f44a203eb 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); -- 2.20.1