Commit 1841b982 authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

lwtunnel: check erspan options before allocating tun_info 



As Jakub suggested on another patch, it's better to do the check
on erspan options before allocating memory.

Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7b6a70f7

net/ipv4/ip_tunnel_core.c

+16 −8
Original line number Diff line number Diff line
@@ -321,6 +321,7 @@ static int ip_tun_parse_opts_erspan(struct nlattr *attr, 
{

	struct nlattr *tb[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1];

	int err;

	u8 ver;



	err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_ERSPAN_MAX, attr,

			       erspan_opt_policy, extack);
@@ -330,24 +331,31 @@ static int ip_tun_parse_opts_erspan(struct nlattr *attr, 
	if (!tb[LWTUNNEL_IP_OPT_ERSPAN_VER])

		return -EINVAL;



	ver = nla_get_u8(tb[LWTUNNEL_IP_OPT_ERSPAN_VER]);

	if (ver == 1) {

		if (!tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX])

			return -EINVAL;

	} else if (ver == 2) {

		if (!tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] ||

		    !tb[LWTUNNEL_IP_OPT_ERSPAN_HWID])

			return -EINVAL;

	} else {

		return -EINVAL;

	}



	if (info) {

		struct erspan_metadata *md =

			ip_tunnel_info_opts(info) + opts_len;



		attr = tb[LWTUNNEL_IP_OPT_ERSPAN_VER];

		md->version = nla_get_u8(attr);



		if (md->version == 1 && tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX]) {

		md->version = ver;

		if (ver == 1) {

			attr = tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX];

			md->u.index = nla_get_be32(attr);

		} else if (md->version == 2 && tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] &&

			   tb[LWTUNNEL_IP_OPT_ERSPAN_HWID]) {

		} else {

			attr = tb[LWTUNNEL_IP_OPT_ERSPAN_DIR];

			md->u.md2.dir = nla_get_u8(attr);

			attr = tb[LWTUNNEL_IP_OPT_ERSPAN_HWID];

			set_hwid(&md->u.md2, nla_get_u8(attr));

		} else {

			return -EINVAL;

		}



		info->key.tun_flags |= TUNNEL_ERSPAN_OPT;

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