Subject: linux-next: manual merge of the net-next tree with the net tree

From: Stephen Rothwell <[email-masked]>
Date: Thu, 2 May 2019 12:57:13 +1000

Hi all,

Today's linux-next merge of the net-next tree got a conflict in:

  net/ipv6/route.c

between commit:

  886b7a50100a ("ipv6: A few fixes on dereferencing rt->from")

from the net tree and commits:

  85bd05deb35a ("ipv6: Pass fib6_result to ip6_rt_cache_alloc")
  5012f0a5944c ("ipv6: Pass fib6_result to rt6_insert_exception")

from the net-next tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc net/ipv6/route.c
index 0520aca3354b,b18e85cd7587..000000000000
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@@ -3391,11 -3494,17 +3489,14 @@@ static void rt6_do_redirect(struct dst_
  		     NDISC_REDIRECT, &ndopts);
  
  	rcu_read_lock();
- 	from = rcu_dereference(rt->from);
- 	if (!from)
+ 	res.f6i = rcu_dereference(rt->from);
 -	/* This fib6_info_hold() is safe here because we hold reference to rt
 -	 * and rt already holds reference to fib6_info.
 -	 */
 -	fib6_info_hold(res.f6i);
 -	rcu_read_unlock();
++	if (!res.f6i)
 +		goto out;
  
- 	nrt = ip6_rt_cache_alloc(from, &msg->dest, NULL);
+ 	res.nh = &res.f6i->fib6_nh;
+ 	res.fib6_flags = res.f6i->fib6_flags;
+ 	res.fib6_type = res.f6i->fib6_type;
+ 	nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL);
  	if (!nrt)
  		goto out;
  
@@@ -3405,8 -3514,11 +3506,8 @@@
  
  	nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
  
 -	/* No need to remove rt from the exception table if rt is
 -	 * a cached route because rt6_insert_exception() will
 -	 * takes care of it
 -	 */
 +	/* rt6_insert_exception() will take care of duplicated exceptions */
- 	if (rt6_insert_exception(nrt, from)) {
+ 	if (rt6_insert_exception(nrt, &res)) {
  		dst_release_immediate(&nrt->dst);
  		goto out;
  	}