1 files changed, 4 insertions, 0 deletions
diff --git a/ext/socket/socket.c b/ext/socket/socket.c
index a47c6d47df..09abc88c18 100644
--- a/ext/socket/socket.c
+++ b/ext/socket/socket.c
@@ -3254,6 +3254,10 @@ sock_s_getservbyport(int argc, VALUE *argv)
 
     rb_scan_args(argc, argv, "11", &port, &proto);
     portnum = NUM2LONG(port);
+    if (portnum != (uint16_t)portnum) {
+	const char *s = portnum > 0 ? "big" : "small";
+	rb_raise(rb_eRangeError, "integer %ld too %s to convert into `int16_t'", portnum, s);
+    }
     if (!NIL_P(proto)) protoname = StringValueCStr(proto);
 
     sp = getservbyport((int)htons((uint16_t)portnum), protoname);