netdev - [PATCH v2 net-next 12/21] ipv6: call dst_hold

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Message-Id: <20170617174244.132862-13-tracywwnj@gmail.com>
Date:   Sat, 17 Jun 2017 10:42:35 -0700
From:   Wei Wang <tracywwnj@...il.com>
To:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Martin KaFai Lau <kafai@...com>, Wei Wang <weiwan@...gle.com>
Subject: [PATCH v2 net-next 12/21] ipv6: call dst_hold_safe() properly

From: Wei Wang <weiwan@...gle.com>

Similar as ipv4, ipv6 path also needs to call dst_hold_safe() when
necessary to avoid double free issue on the dst.

Signed-off-by: Wei Wang <weiwan@...gle.com>
Acked-by: Martin KaFai Lau <kafai@...com>
---
 net/ipv6/addrconf.c | 4 ++--
 net/ipv6/route.c    | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 0aa36b093013..2a6397714d70 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -5576,8 +5576,8 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
 				ip6_del_rt(rt);
 		}
 		if (ifp->rt) {
-			dst_hold(&ifp->rt->dst);
-			ip6_del_rt(ifp->rt);
+			if (dst_hold_safe(&ifp->rt->dst))
+				ip6_del_rt(ifp->rt);
 		}
 		rt_genid_bump_ipv6(net);
 		break;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 908b71188c57..c52c51908881 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1366,8 +1366,8 @@ static void ip6_link_failure(struct sk_buff *skb)
 	rt = (struct rt6_info *) skb_dst(skb);
 	if (rt) {
 		if (rt->rt6i_flags & RTF_CACHE) {
-			dst_hold(&rt->dst);
-			ip6_del_rt(rt);
+			if (dst_hold_safe(&rt->dst))
+				ip6_del_rt(rt);
 		} else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
 			rt->rt6i_node->fn_sernum = -1;
 		}
-- 
2.13.1.518.g3df882009-goog