From: YueHaibing <yuehaibing@huawei.com>
Date: Sat, 3 Dec 2022 09:46:35 +0000 (+0800)
Subject: tipc: Fix potential OOB in tipc_link_proto_rcv()
X-Git-Tag: Proxmox-5.15.83-1~20
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=36d0a5fa8ccdf723710010ce8b808a1408637a28;p=mirror_ubuntu-jammy-kernel.git

tipc: Fix potential OOB in tipc_link_proto_rcv()

[ Upstream commit 743117a997bbd4840e827295c07e59bcd7f7caa3 ]

Fix the potential risk of OOB if skb_linearize() fails in
tipc_link_proto_rcv().

Fixes: 5cbb28a4bf65 ("tipc: linearize arriving NAME_DISTR and LINK_PROTO buffers")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20221203094635.29024-1-yuehaibing@huawei.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit af4ccae4b704ee333e199ca27542be0ed040b269)
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
---

diff --git a/net/tipc/link.c b/net/tipc/link.c
index 115a4a7950f5..8fdd3b23bd12 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -2223,7 +2223,9 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
 	if (tipc_own_addr(l->net) > msg_prevnode(hdr))
 		l->net_plane = msg_net_plane(hdr);
 
-	skb_linearize(skb);
+	if (skb_linearize(skb))
+		goto exit;
+
 	hdr = buf_msg(skb);
 	data = msg_data(hdr);