linux-kernel - [PATCH net] tipc: check skb_linearize() return value in tipc_disc

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Message-ID: <20221119072832.7896-1-yuehaibing@huawei.com>
Date:   Sat, 19 Nov 2022 15:28:32 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <jmaloy@...hat.com>, <ying.xue@...driver.com>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>
CC:     <netdev@...r.kernel.org>, <tipc-discussion@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH net] tipc: check skb_linearize() return value in tipc_disc_rcv()

If skb_linearize() fails in tipc_disc_rcv(), we need to free the skb instead of
handle it.

Fixes: 25b0b9c4e835 ("tipc: handle collisions of 32-bit node address hash values")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 net/tipc/discover.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/tipc/discover.c b/net/tipc/discover.c
index e8630707901e..e8dcdf267c0c 100644
--- a/net/tipc/discover.c
+++ b/net/tipc/discover.c
@@ -211,7 +211,10 @@ void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
 	u32 self;
 	int err;
 
-	skb_linearize(skb);
+	if (skb_linearize(skb)) {
+		kfree_skb(skb);
+		return;
+	}
 	hdr = buf_msg(skb);
 
 	if (caps & TIPC_NODE_ID128)
-- 
2.17.1