linux-kernel - [PATCH v2,net-next 1/2] ip_gre: fix potential memory leak in erspan

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Message-Id: <1513392519-30127-1-git-send-email-yanhaishuang@cmss.chinamobile.com>
Date:   Sat, 16 Dec 2017 10:48:38 +0800
From:   Haishuang Yan <yanhaishuang@...s.chinamobile.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Haishuang Yan <yanhaishuang@...s.chinamobile.com>,
        William Tu <u9012063@...il.com>
Subject: [PATCH v2,net-next 1/2] ip_gre: fix potential memory leak in erspan_rcv

If md is NULL, tun_dst must be freed, otherwise it will cause memory
leak.

Fixes: 1a66a836da6 ("gre: add collect_md mode to ERSPAN tunnel")
Cc: William Tu <u9012063@...il.com>
Signed-off-by: Haishuang Yan <yanhaishuang@...s.chinamobile.com>

Change since v2:
  * Rebase on latest master branch.
  * Correct wrong fix information.
---
 net/ipv4/ip_gre.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 004800b..33af55a 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -311,8 +311,10 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
 				return PACKET_REJECT;
 
 			md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
-			if (!md)
+			if (!md) {
+				dst_release((struct dst_entry *)tun_dst);
 				return PACKET_REJECT;
+			}
 
 			memcpy(md, pkt_md, sizeof(*md));
 			md->version = ver;
-- 
1.8.3.1