--- source3/smbd/sesssetup.c.orig	2018-01-19 16:04:53.950557502 -0700
+++ source3/smbd/sesssetup.c	2018-01-19 16:06:22.680714874 -0700
@@ -513,7 +513,8 @@
 	 * contains a string like:
 	 * 'ipv4:127.0.0.1:48163'
 	 */
-	if (strstr(addr, state->ip)  == NULL) {
+	const char *p;
+	if ((p = strstr(addr, state->ip)) == NULL || strspn(p+strlen(state->ip), "0123456789") != 0) {
 		DEBUG(10, ("%s does not match %s\n", state->ip, addr));
 		return 0;
 	}