headius	2013-08-04 06:53:54 +0900 (Sun, 04 Aug 2013)

  New Revision: 42366

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=42366

  Log:
    * ext/stringio/stringio.c (strio_substr): Trivial fix for invalid
      pointer when len = 0 and pos outside of string. Bug #8728.

  Modified files:
    trunk/ext/stringio/stringio.c

Index: ext/stringio/stringio.c
===================================================================
--- ext/stringio/stringio.c	(revision 42365)
+++ ext/stringio/stringio.c	(revision 42366)
@@ -102,6 +102,7 @@ strio_substr(struct StringIO *ptr, long https://github.com/ruby/ruby/blob/trunk/ext/stringio/stringio.c#L102
 
     if (len > rlen) len = rlen;
     if (len < 0) len = 0;
+    if (len == 0) return rb_str_new(0,0);
     return rb_enc_str_new(RSTRING_PTR(str)+pos, len, enc);
 }
 

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