Commit 3e9e67f6 authored by Jane Zhou's avatar Jane Zhou Committed by Luis Henriques

net/ping: handle protocol mismatching scenario

commit 91a0b603 upstream.

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@davemloft.net>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: James Morris <jmorris@namei.org>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: Patrick McHardy <kaber@trash.net>
Cc: netdev@vger.kernel.org
Signed-off-by: default avatarJane Zhou <a17711@motorola.com>
Signed-off-by: default avatarYiwei Zhao <gbjc64@motorola.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent e6631406
...@@ -217,6 +217,8 @@ static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident) ...@@ -217,6 +217,8 @@ static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
&ipv6_hdr(skb)->daddr)) &ipv6_hdr(skb)->daddr))
continue; continue;
#endif #endif
} else {
continue;
} }
if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
......
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