ext/kgio/read_write.c in kgio-1.2.1 vs ext/kgio/read_write.c in kgio-1.3.0

@@ -231,10 +231,10 @@
 				if (a->len <= 0)
 					goto done;
 				a->ptr = RSTRING_PTR(a->buf) + written;
 				return -1;
 			} else if (written > 0) {
-				a->buf = rb_str_new(a->ptr + n, a->len - n);
+				a->buf = rb_str_new(a->ptr, a->len);
 			} else {
 				a->buf = mKgio_WaitWritable;
 			}
 			return 0;
 		}