* util.c (ruby_strtod): check there is at least 1 digit after

  "0x" before ".". [ruby-dev:42183] #3790

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29187 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 2 deletions

diff --git a/util.c b/util.c
index 9d10498a66..40b4573660 100644
--- a/util.c
+++ b/util.c
@@ -2123,10 +2123,11 @@ break2:
 	    s0 = ++s;
 	    adj = 0;
 
-	    while (*++s && (s1 = strchr(hexdigit, *s))) {
+	    if (!*++s || !(s1 = strchr(hexdigit, *s))) goto ret0;
+	    do {
 		adj *= 16;
 		adj += (s1 - hexdigit) & 15;
-	    }
+	    } while (*++s && (s1 = strchr(hexdigit, *s)));
 
 	    if (*s == '.') {
 		aadj = 1.;