Fix parsing of static ndp entries

diff --git a/src/ndp.c b/src/ndp.c
index 6d18bb5bae5e9e135dce833c6e8770c3268fc88b..e006c85261af4180147fb6b79b1d37a95f7a8e99 100644 (file)
--- a/src/ndp.c
+++ b/src/ndp.c
@@ -167,6 +167,7 @@ int setup_ndp_interface(struct interface *iface, bool enable)
                        memcpy(entry, iface->static_ndp, iface->static_ndp_len);
 
                        for (entry = strtok_r(entry, " ", &saveptr); entry; entry = strtok_r(NULL, " ", &saveptr)) {
+                               char *sep;
                                struct ndp_neighbor *n = malloc(sizeof(*n));
                                if (!n) {
                                        syslog(LOG_ERR, "Malloc failed for static NDP-prefix %s", entry);
@@ -176,12 +177,20 @@ int setup_ndp_interface(struct interface *iface, bool enable)
                                n->iface = iface;
                                n->timeout = 0;
 
-                               char ipbuf[INET6_ADDRSTRLEN];
-                               if (sscanf(entry, "%45s/%hhu", ipbuf, &n->len) < 2
-                                               || n->len > 128 || inet_pton(AF_INET6, ipbuf, &n->addr) != 1) {
+                               sep = strchr(entry, '/');
+                               if (!sep) {
+                                       free(n);
                                        syslog(LOG_ERR, "Invalid static NDP-prefix %s", entry);
                                        return -1;
                                }
+                               
+                               *sep = 0;
+                               n->len = atoi(sep + 1);
+                               if (inet_pton(AF_INET6, entry, &n->addr) != 1 || n->len > 128) {
+                                       free(n);
+                                       syslog(LOG_ERR, "Invalid static NDP-prefix %s/%s", entry, sep + 1);
+                                       return -1;
+                               }
 
                                list_add(&n->head, &neighbors);
                        }