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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 <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
This commit is contained in:
Allan Stephens 2011-04-19 10:17:58 -04:00 committed by Paul Gortmaker
parent 7f47f5c751
commit bebc55aeff
2 changed files with 4 additions and 7 deletions
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4
net/tipc/bcast.c
View File

@ -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++;

7
net/tipc/link.c
View File

@ -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);