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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, David Ahern <dsahern@gmail.com>,
        Nikolay Aleksandrov <nikolay@cumulusnetworks.com>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 5.4 132/142] nexthops: Move code from remove_nexthop_from_groups to remove_nh_grp_entry
Date:   Mon,  1 Jun 2020 19:54:50 +0200
Message-Id: <20200601174051.419758940@linuxfoundation.org>
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From: David Ahern <dsahern@gmail.com>

commit ac21753a5c2c9a6a2019997481a2ac12bbde48c8 upstream.

Move nh_grp dereference and check for removing nexthop group due to
all members gone into remove_nh_grp_entry.

Fixes: 430a049190de ("nexthop: Add support for nexthop groups")
Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/ipv4/nexthop.c |   27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

--- a/net/ipv4/nexthop.c
+++ b/net/ipv4/nexthop.c
@@ -695,17 +695,21 @@ static void nh_group_rebalance(struct nh
 	}
 }
 
-static void remove_nh_grp_entry(struct nh_grp_entry *nhge,
-				struct nh_group *nhg,
+static void remove_nh_grp_entry(struct net *net, struct nh_grp_entry *nhge,
 				struct nl_info *nlinfo)
 {
+	struct nexthop *nhp = nhge->nh_parent;
 	struct nexthop *nh = nhge->nh;
 	struct nh_grp_entry *nhges;
+	struct nh_group *nhg;
 	bool found = false;
 	int i;
 
 	WARN_ON(!nh);
 
+	list_del(&nhge->nh_list);
+
+	nhg = rtnl_dereference(nhp->nh_grp);
 	nhges = nhg->nh_entries;
 	for (i = 0; i < nhg->num_nh; ++i) {
 		if (found) {
@@ -729,7 +733,11 @@ static void remove_nh_grp_entry(struct n
 	nexthop_put(nh);
 
 	if (nlinfo)
-		nexthop_notify(RTM_NEWNEXTHOP, nhge->nh_parent, nlinfo);
+		nexthop_notify(RTM_NEWNEXTHOP, nhp, nlinfo);
+
+	/* if this group has no more entries then remove it */
+	if (!nhg->num_nh)
+		remove_nexthop(net, nhp, nlinfo);
 }
 
 static void remove_nexthop_from_groups(struct net *net, struct nexthop *nh,
@@ -737,17 +745,8 @@ static void remove_nexthop_from_groups(s
 {
 	struct nh_grp_entry *nhge, *tmp;
 
-	list_for_each_entry_safe(nhge, tmp, &nh->grp_list, nh_list) {
-		struct nh_group *nhg;
-
-		list_del(&nhge->nh_list);
-		nhg = rtnl_dereference(nhge->nh_parent->nh_grp);
-		remove_nh_grp_entry(nhge, nhg, nlinfo);
-
-		/* if this group has no more entries then remove it */
-		if (!nhg->num_nh)
-			remove_nexthop(net, nhge->nh_parent, nlinfo);
-	}
+	list_for_each_entry_safe(nhge, tmp, &nh->grp_list, nh_list)
+		remove_nh_grp_entry(net, nhge, nlinfo);
 }
 
 static void remove_nexthop_group(struct nexthop *nh, struct nl_info *nlinfo)