From: Sascha Hlusiak <contact@saschahlusiak.de>
Date: Tue, 19 May 2009 12:56:48 +0000 (+0000)
Subject: sit: Fail to create tunnel, if it already exists
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8db99e5717507729a9eb49108facb7e528340376;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

sit: Fail to create tunnel, if it already exists

When locating the tunnel, do not continue if it is found. Otherwise
a different tunnel with similar configuration would be returned and
parts could be overwritten.

Signed-off-by: Sascha Hlusiak <contact@saschahlusiak.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 664ab82e03b2..e62504133c77 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -165,8 +165,13 @@ static struct ip_tunnel * ipip6_tunnel_locate(struct net *net,
 	struct sit_net *sitn = net_generic(net, sit_net_id);
 
 	for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) {
-		if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
-			return t;
+		if (local == t->parms.iph.saddr &&
+		    remote == t->parms.iph.daddr) {
+			if (create)
+				return NULL;
+			else
+				return t;
+		}
 	}
 	if (!create)
 		goto failed;