Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Zheng Yongjun <zhengyongjun3@huawei.com>
To:     <davem@davemloft.net>, <yoshfuji@linux-ipv6.org>,
        <dsahern@kernel.org>, <kuba@kernel.org>, <netdev@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
CC:     Zheng Yongjun <zhengyongjun3@huawei.com>
Subject: [PATCH] ping: Check return value of function 'ping_queue_rcv_skb'
Date:   Mon, 7 Jun 2021 17:10:58 +0800
Message-ID: <20210607091058.2766648-1-zhengyongjun3@huawei.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 7BIT
Content-Type:   text/plain; charset=US-ASCII
Precedence: bulk

Function 'ping_queue_rcv_skb' not always return success, which will
also return fail. If not check the wrong return value of it, lead to function
`ping_rcv` return success.

Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
---
 net/ipv4/ping.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index 1c9f71a37258..8e84cde95011 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -968,10 +968,11 @@ bool ping_rcv(struct sk_buff *skb)
 		struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
 
 		pr_debug("rcv on socket %p\n", sk);
-		if (skb2)
-			ping_queue_rcv_skb(sk, skb2);
+		if (skb2 && !ping_queue_rcv_skb(sk, skb2)) {
+			sock_put(sk);
+			return true;
+		}
 		sock_put(sk);
-		return true;
 	}
 	pr_debug("no socket, dropping\n");
 
-- 
2.25.1