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From:   YueHaibing <yuehaibing@huawei.com>
To:     <jmaloy@redhat.com>, <ying.xue@windriver.com>,
        <davem@davemloft.net>, <edumazet@google.com>, <kuba@kernel.org>,
        <pabeni@redhat.com>
CC:     <netdev@vger.kernel.org>, <tipc-discussion@lists.sourceforge.net>,
        <linux-kernel@vger.kernel.org>, YueHaibing <yuehaibing@huawei.com>
Subject: [PATCH net] tipc: Fix potential OOB in tipc_link_proto_rcv()
Date:   Sat, 3 Dec 2022 17:46:35 +0800
Message-ID: <20221203094635.29024-1-yuehaibing@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

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>
---
 net/tipc/link.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/tipc/link.c b/net/tipc/link.c
index e260c0d557f5..b3ce24823f50 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -2224,7 +2224,9 @@ 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);
 
-- 
2.34.1