From: Jesper Dangaard Brouer <brouer@redhat.com>
Date: Wed, 11 Jul 2018 17:01:20 +0200
Subject: net: ipv4: fix listify ip_rcv_finish in case of forwarding
Patch-mainline: v4.19-rc1
Git-commit: 0761680d521559813648fb430ddeb479c97ab060
References: bsc#1109837

In commit 5fa12739a53d ("net: ipv4: listify ip_rcv_finish") calling
dst_input(skb) was split-out.  The ip_sublist_rcv_finish() just calls
dst_input(skb) in a loop.

The problem is that ip_sublist_rcv_finish() forgot to remove the SKB
from the list before invoking dst_input().  Further more we need to
clear skb->next as other parts of the network stack use another kind
of SKB lists for xmit_more (see dev_hard_start_xmit).

A crash occurs if e.g. dst_input() invoke ip_forward(), which calls
dst_output()/ip_output() that eventually calls __dev_queue_xmit() +
sch_direct_xmit(), and a crash occurs in validate_xmit_skb_list().

This patch only fixes the crash, but there is a huge potential for
a performance boost if we can pass an SKB-list through to ip_forward.

Fixes: 5fa12739a53d ("net: ipv4: listify ip_rcv_finish")
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/ipv4/ip_input.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -531,8 +531,14 @@ static void ip_sublist_rcv_finish(struct
 {
 	struct sk_buff *skb, *next;
 
-	list_for_each_entry_safe(skb, next, head, list)
+	list_for_each_entry_safe(skb, next, head, list) {
+		list_del(&skb->list);
+		/* Handle ip{6}_forward case, as sch_direct_xmit have
+		 * another kind of SKB-list usage (see validate_xmit_skb_list)
+		 */
+		skb->next = NULL;
 		dst_input(skb);
+	}
 }
 
 static void ip_list_rcv_finish(struct net *net, struct sock *sk,