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Date:   Wed, 22 Sep 2021 23:37:55 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     zhang kai <zhangkaiheb@....com>, David Ahern <dsahern@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, yoshfuji@...ux-ipv6.org,
        kuba@...nel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.14 07/34] ipv6: delay fib6_sernum increase in fib6_add

From: zhang kai <zhangkaiheb@....com>

[ Upstream commit e87b5052271e39d62337ade531992b7e5d8c2cfa ]

only increase fib6_sernum in net namespace after add fib6_info
successfully.

Signed-off-by: zhang kai <zhangkaiheb@....com>
Reviewed-by: David Ahern <dsahern@...nel.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/ipv6/ip6_fib.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index ef75c9b05f17..68e94e9f5089 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1378,7 +1378,6 @@ int fib6_add(struct fib6_node *root, struct fib6_info *rt,
 	int err = -ENOMEM;
 	int allow_create = 1;
 	int replace_required = 0;
-	int sernum = fib6_new_sernum(info->nl_net);
 
 	if (info->nlh) {
 		if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
@@ -1478,7 +1477,7 @@ int fib6_add(struct fib6_node *root, struct fib6_info *rt,
 	if (!err) {
 		if (rt->nh)
 			list_add(&rt->nh_list, &rt->nh->f6i_list);
-		__fib6_update_sernum_upto_root(rt, sernum);
+		__fib6_update_sernum_upto_root(rt, fib6_new_sernum(info->nl_net));
 		fib6_start_gc(info->nl_net, rt);
 	}
 
-- 
2.30.2

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