Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752000AbdFHA6Z (ORCPT ); Wed, 7 Jun 2017 20:58:25 -0400 Received: from cmccmta1.chinamobile.com ([221.176.66.79]:20378 "EHLO cmccmta1.chinamobile.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751733AbdFHA6X (ORCPT ); Wed, 7 Jun 2017 20:58:23 -0400 X-RM-TRANSID: 2ee45938a127b7e-84c43 X-RM-SPAM-FLAG: 00000000 X-RM-TRANSID: 2ee75938a12554e-24b54 From: Haishuang Yan To: "=David S. Miller" , Alexey Kuznetsov , James Morris , Hideaki YOSHIFUJI , Patrick McHardy Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Haishuang Yan , Pravin B Shelar , Haishuang Yan Subject: [PATCH v2 1/2] ip_tunnel: fix potential issue in ip_tunnel_rcv Date: Thu, 8 Jun 2017 08:57:55 +0800 Message-Id: <1496883476-17445-1-git-send-email-yanhaishuang@cmss.chinamobile.com> X-Mailer: git-send-email 1.8.3.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1109 Lines: 38 When ip_tunnel_rcv fails, the tun_dst won't be freed, so move skb_dst_set to begin and tun_dst would be freed by kfree_skb. CC: Pravin B Shelar Fixes: 2e15ea390e6f ("ip_gre: Add support to collect tunnel metadata.") Signed-off-by: Haishuang Yan --- net/ipv4/ip_tunnel.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c index b878ecb..27fc20f 100644 --- a/net/ipv4/ip_tunnel.c +++ b/net/ipv4/ip_tunnel.c @@ -386,6 +386,9 @@ int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, const struct iphdr *iph = ip_hdr(skb); int err; + if (tun_dst) + skb_dst_set(skb, (struct dst_entry *)tun_dst); + #ifdef CONFIG_NET_IPGRE_BROADCAST if (ipv4_is_multicast(iph->daddr)) { tunnel->dev->stats.multicast++; @@ -439,9 +442,6 @@ int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, skb->dev = tunnel->dev; } - if (tun_dst) - skb_dst_set(skb, (struct dst_entry *)tun_dst); - gro_cells_receive(&tunnel->gro_cells, skb); return 0; -- 1.8.3.1