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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: 1a66a836da ("gre: add collect_md mode to ERSPAN tunnel")
Cc: William Tu <u9012063@gmail.com>
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Haishuang Yan 2017-12-20 10:07:00 +08:00 committed by David S. Miller
parent a7343211f0
commit 50670b6ee9
1 changed files with 3 additions and 1 deletions
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4
net/ipv4/ip_gre.c
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@ -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;