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tipc: fix memory leak in tipc_link_xmit 

[ Upstream commit 69ae94725f ]

In case the backlog transmit queue for system-importance messages is overloaded,
tipc_link_xmit() returns -ENOBUFS but the skb list is not purged. This leads to
memory leak and failure when a skb is allocated.

This commit fixes this issue by purging the skb list before tipc_link_xmit()
returns.

Fixes: 365ad353c2 ("tipc: reduce risk of user starvation during link congestion")
Signed-off-by: Tung Nguyen <tung.quang.nguyen@est.tech>
Link: https://patch.msgid.link/20250403092431.514063-1-tung.quang.nguyen@est.tech
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 09c2dcda2c551bba30710c33f6ac678ae7395389)
This commit is contained in:
Tung Nguyen 2025-04-03 09:24:31 +00:00 committed by Wentao Guan
parent 0b4ead4029
commit 4351b1b41c
1 changed files with 1 additions and 0 deletions
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1
net/tipc/link.c
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@ -1068,6 +1068,7 @@ int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) {
if (imp == TIPC_SYSTEM_IMPORTANCE) {
pr_warn("%s<%s>, link overflow", link_rst_msg, l->name);
__skb_queue_purge(list);
return -ENOBUFS;
}
rc = link_schedule_user(l, hdr);