linux-kernel - [PATCH] net/ping: handle protocol mismatching scenario

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Message-Id: <1416858248-29258-1-git-send-email-a17711@motorola.com>
Date:	Mon, 24 Nov 2014 11:44:08 -0800
From:	Jane Zhou <a17711@...orola.com>
To:	linux-kernel@...r.kernel.org
Cc:	Jane Zhou <a17711@...orola.com>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	stable@...r.kernel.org, Yiwei Zhao <gbjc64@...orola.com>
Subject: [PATCH] net/ping: handle protocol mismatching scenario

ping_lookup() may return a wrong sock if sk_buff's and sock's protocols
dont' match. For example, sk_buff's protocol is ETH_P_IPV6, but sock's
sk_family is AF_INET, in that case, if sk->sk_bound_dev_if is zero, a wrong
sock will be returned.
the fix is to "continue" the searching, if no matching, return NULL.

Cc: "David S. Miller" <davem@...emloft.net>
Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru>
Cc: James Morris <jmorris@...ei.org>
Cc: Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Cc: Patrick McHardy <kaber@...sh.net>
Cc: netdev@...r.kernel.org
Cc: stable@...r.kernel.org
Signed-off-by: Jane Zhou <a17711@...orola.com>
Signed-off-by: Yiwei Zhao <gbjc64@...orola.com>
---
 net/ipv4/ping.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index fc1c4b1..8892913 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -214,6 +214,8 @@ static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
 					     &ipv6_hdr(skb)->daddr))
 				continue;
 #endif
+		} else {
+			continue;
 		}
 
 		if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
-- 
1.8.0

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