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authorXin Long <lucien.xin@gmail.com>2019-11-21 13:14:50 +0300
committerDavid S. Miller <davem@davemloft.net>2019-11-21 22:47:39 +0300
commit1841b9829903c82e0445032ad4a7556fcc44a497 (patch)
tree2911c68138c4e298783e4f442eca5eccbc1f0bef /net/ipv4
parent7b6a70f7376479ee0a185b7c2e57b26243f1052d (diff)
downloadlinux-1841b9829903c82e0445032ad4a7556fcc44a497.tar.xz
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: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/ip_tunnel_core.c24
1 files changed, 16 insertions, 8 deletions
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 0a7eaadc9a8d..47f8b947eef1 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -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;