From 50670b6ee9bc4ae8f9ce3112b437987adf273245 Mon Sep 17 00:00:00 2001 From: Haishuang Yan Date: Wed, 20 Dec 2017 10:07:00 +0800 Subject: [PATCH] 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 Signed-off-by: Haishuang Yan Signed-off-by: David S. Miller --- 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 5c36b6745dbc..90c912307814 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -313,8 +313,10 @@ 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; -- 2.45.2