From 84895f5ce3829d9fc030e5ec2d8729da4c0c9d08 Mon Sep 17 00:00:00 2001 From: Tung Nguyen Date: Thu, 3 Apr 2025 09:24:31 +0000 Subject: [PATCH] tipc: fix memory leak in tipc_link_xmit [ Upstream commit 69ae94725f4fc9e75219d2d69022029c5b24bc9a ] 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: 365ad353c256 ("tipc: reduce risk of user starvation during link congestion") Signed-off-by: Tung Nguyen Link: https://patch.msgid.link/20250403092431.514063-1-tung.quang.nguyen@est.tech Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- net/tipc/link.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/tipc/link.c b/net/tipc/link.c index b653d16ab21f..2052649fb537 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -969,6 +969,7 @@ 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);