From: Miaohe Lin <linmiaohe@huawei.com>
Date: Sat, 27 Jun 2020 15:47:51 +0800
Subject: net: ipv4: Fix wrong type conversion from hint to rt in
 ip_route_use_hint()
Patch-mainline: v5.8-rc5
Git-commit: 2ce578ca9444bb44da66b9a494f56e7ec12e6466
References: bsc#1154353

We can't cast sk_buff to rtable by (struct rtable *)hint. Use skb_rtable().

Fixes: 02b24941619f ("ipv4: use dst hint for ipv4 list receive")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/ipv4/route.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2029,7 +2029,7 @@ int ip_route_use_hint(struct sk_buff *sk
 		      const struct sk_buff *hint)
 {
 	struct in_device *in_dev = __in_dev_get_rcu(dev);
-	struct rtable *rt = (struct rtable *)hint;
+	struct rtable *rt = skb_rtable(hint);
 	struct net *net = dev_net(dev);
 	int err = -EINVAL;
 	u32 tag = 0;