From 0bbd60b52348a9c1938d8cce7a1d5aea996e7e1e Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Sun, 21 May 2017 22:55:28 +0900
Subject: IO#sysread should raise error when invalid pos

---
 src/io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/io.c b/src/io.c
index f15f182f2..7a1121338 100644
--- a/src/io.c
+++ b/src/io.c
@@ -623,7 +623,7 @@ mrb_io_sysread(mrb_state *mrb, mrb_value io)
 
   mrb_get_args(mrb, "i|S", &maxlen, &buf);
   if (maxlen < 0) {
-    return mrb_nil_value();
+    mrb_raise(mrb, E_ARGUMENT_ERROR, "negative expanding string size");
   }
   else if (maxlen == 0) {
     return mrb_str_new(mrb, NULL, maxlen);
-- 
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