rpcrt4: Even though FC_ENUM16 is an unsigned type, the highest allowable value…

dlls/rpcrt4/ndr_marshall.c

@@ -5354,7 +5354,7 @@ static unsigned char *WINAPI NdrBaseTypeMarshall(
         break;
     case RPC_FC_ENUM16:
         /* only 16-bits on the wire, so do a sanity check */
-        if (*(UINT *)pMemory > USHRT_MAX)
+        if (*(UINT *)pMemory > SHRT_MAX)
             RpcRaiseException(RPC_X_ENUM_VALUE_OUT_OF_RANGE);
         ALIGN_POINTER(pStubMsg->Buffer, sizeof(USHORT));
         *(USHORT *)pStubMsg->Buffer = *(UINT *)pMemory;

dlls/rpcrt4/tests/ndr_marshall.c

@@ -418,8 +418,9 @@ static void test_simple_types(void)
     test_pointer_marshal(fmtstr_up_short, &s, 2, wiredata, 6, NULL, 0, "up_short");
     test_pointer_marshal(fmtstr_up_ushort, &s, 2, wiredata, 6, NULL, 0, "up_ushort");
 
-    i = s;
+    i = 0x7fff;
     *(void**)wiredata = &i;
+    *(unsigned short*)(wiredata + sizeof(void*)) = i;
     test_pointer_marshal(fmtstr_up_enum16, &i, 2, wiredata, 6, NULL, 0, "up_enum16");
 
     l = 0xcafebabe;