From: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Date: Mon, 5 Feb 2007 04:15:04 +0000 (-0800)
Subject: [IPV6] ROUTE: Do not route packets to link-local address on other device.
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a0d78ebf3a0e33a1aeacf2fc518ad9273d6a1c2f;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

[IPV6] ROUTE: Do not route packets to link-local address on other device.

With help from Wei Dong <weid@np.css.fujitsu.com>.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index f4fda80a41a2..19c906f6efa1 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -311,12 +311,21 @@ static inline void rt6_probe(struct rt6_info *rt)
 static int inline rt6_check_dev(struct rt6_info *rt, int oif)
 {
 	struct net_device *dev = rt->rt6i_dev;
-	if (!oif || dev->ifindex == oif)
+	int ret = 0;
+
+	if (!oif)
 		return 2;
-	if ((dev->flags & IFF_LOOPBACK) &&
-	    rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
-		return 1;
-	return 0;
+	if (dev->flags & IFF_LOOPBACK) {
+		if (!WARN_ON(rt->rt6i_idev == NULL) &&
+		    rt->rt6i_idev->dev->ifindex == oif)
+			ret = 1;
+		else
+			return 0;
+	}
+	if (dev->ifindex == oif)
+		return 2;
+
+	return ret;
 }
 
 static int inline rt6_check_neigh(struct rt6_info *rt)