From: Wei Wang <weiwan@google.com> Date: Sat, 17 Jun 2017 17:42:35 +0000 (-0700) Subject: ipv6: call dst_hold_safe() properly X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=ad65a2f05695aced349e308193c6e2a6b1d87112;p=openwrt%2Fstaging%2Fblogic.git ipv6: call dst_hold_safe() properly 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@google.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net> --- 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; }