diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index ddb1c43..53bf996 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -2157,14 +2157,18 @@
 
         if (!PyArg_ParseTuple(args, "ss|HH:getsockaddrarg",
                                 &type, &name, &sa->salg_feat, &sa->salg_mask))
+        {
             return 0;
-        /* sockaddr_alg has fixed-sized char arrays for type and name */
-        if (strlen(type) > sizeof(sa->salg_type)) {
+        }
+        /* sockaddr_alg has fixed-sized char arrays for type, and name
+         * both must be NULL terminated.
+         */
+        if (strlen(type) >= sizeof(sa->salg_type)) {
             PyErr_SetString(PyExc_ValueError, "AF_ALG type too long.");
             return 0;
         }
         strncpy((char *)sa->salg_type, type, sizeof(sa->salg_type));
-        if (strlen(name) > sizeof(sa->salg_name)) {
+        if (strlen(name) >= sizeof(sa->salg_name)) {
             PyErr_SetString(PyExc_ValueError, "AF_ALG name too long.");
             return 0;
         }