]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blobdiff - net/mpls/af_mpls.c
UBUNTU: Ubuntu-4.15.0-96.97
[mirror_ubuntu-bionic-kernel.git] / net / mpls / af_mpls.c
index 8ca9915befc8caab8270281028d4eb0ee3983fbd..568233e44b6e68596000ba73fa8b25aca670eda6 100644 (file)
@@ -8,6 +8,7 @@
 #include <linux/ipv6.h>
 #include <linux/mpls.h>
 #include <linux/netconf.h>
+#include <linux/nospec.h>
 #include <linux/vmalloc.h>
 #include <linux/percpu.h>
 #include <net/ip.h>
@@ -935,24 +936,27 @@ errout:
        return err;
 }
 
-static bool mpls_label_ok(struct net *net, unsigned int index,
+static bool mpls_label_ok(struct net *net, unsigned int *index,
                          struct netlink_ext_ack *extack)
 {
+       bool is_ok = true;
+
        /* Reserved labels may not be set */
-       if (index < MPLS_LABEL_FIRST_UNRESERVED) {
+       if (*index < MPLS_LABEL_FIRST_UNRESERVED) {
                NL_SET_ERR_MSG(extack,
                               "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher");
-               return false;
+               is_ok = false;
        }
 
        /* The full 20 bit range may not be supported. */
-       if (index >= net->mpls.platform_labels) {
+       if (is_ok && *index >= net->mpls.platform_labels) {
                NL_SET_ERR_MSG(extack,
                               "Label >= configured maximum in platform_labels");
-               return false;
+               is_ok = false;
        }
 
-       return true;
+       *index = array_index_nospec(*index, net->mpls.platform_labels);
+       return is_ok;
 }
 
 static int mpls_route_add(struct mpls_route_config *cfg,
@@ -975,7 +979,7 @@ static int mpls_route_add(struct mpls_route_config *cfg,
                index = find_free_label(net);
        }
 
-       if (!mpls_label_ok(net, index, extack))
+       if (!mpls_label_ok(net, &index, extack))
                goto errout;
 
        /* Append makes no sense with mpls */
@@ -1052,7 +1056,7 @@ static int mpls_route_del(struct mpls_route_config *cfg,
 
        index = cfg->rc_label;
 
-       if (!mpls_label_ok(net, index, extack))
+       if (!mpls_label_ok(net, &index, extack))
                goto errout;
 
        mpls_route_update(net, index, NULL, &cfg->rc_nlinfo);
@@ -1810,10 +1814,13 @@ static int rtm_to_route_config(struct sk_buff *skb,
                                goto errout;
 
                        if (!mpls_label_ok(cfg->rc_nlinfo.nl_net,
-                                          cfg->rc_label, extack))
+                                          &cfg->rc_label, extack))
                                goto errout;
                        break;
                }
+               case RTA_GATEWAY:
+                       NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute");
+                       goto errout;
                case RTA_VIA:
                {
                        if (nla_get_via(nla, &cfg->rc_via_alen,
@@ -2137,7 +2144,7 @@ static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
                        goto errout;
                }
 
-               if (!mpls_label_ok(net, in_label, extack)) {
+               if (!mpls_label_ok(net, &in_label, extack)) {
                        err = -EINVAL;
                        goto errout;
                }