From 1b7bac24c83d2f2fddfed49034ab88364b160cec Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 31 Mar 2017 07:34:46 +0000
Subject: debug.c: check codepage value [ci skip]

* debug.c (set_debug_option): check garbage and overflow.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58225 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 debug.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

(limited to 'debug.c')

diff --git a/debug.c b/debug.c
index e785af98f4..b289969952 100644
--- a/debug.c
+++ b/debug.c
@@ -135,11 +135,15 @@ set_debug_option(const char *str, int len, void *arg)
 # if RUBY_MSVCRT_VERSION >= 80
     SET_WHEN("rtc_error", ruby_w32_rtc_error, 1);
 # endif
-    if (NAME_MATCH_VALUE("codepage")) {
+    {
 	int ov;
 	size_t retlen;
-	ruby_w32_codepage =
-	    ruby_scan_digits(str, len, 10, &retlen, &ov);
+	unsigned long n;
+	if (NAME_MATCH_VALUE("codepage") &&
+	    (n = ruby_scan_digits(str, len, 10, &retlen, &ov),
+	     (size_t)len == retlen && !ov)) {
+	    ruby_w32_codepage = (UINT)n;
+	}
 	return;
     }
 #endif
-- 
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