From: Pierce Lopez <pierce.lopez@gmail.com>
Date: Sat, 16 Jul 2016 04:30:31 +0000 (-0400)
Subject: initialize null terminator of new printbuf
X-Git-Tag: json-c-0.13-20171207~146^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F239%2Fhead;p=thirdparty%2Fjson-c.git

initialize null terminator of new printbuf

It's possible (e.g. by using json_object_from_file() on an empty file)
to get json-c to try to use a printbuf that has never had anything
written to it. Before this change, it could access a string that
should be length zero, but was never initialized, and could
theoretically have an unexpected string.
---

diff --git a/printbuf.c b/printbuf.c
index fe952b45..a40b89d5 100644
--- a/printbuf.c
+++ b/printbuf.c
@@ -42,6 +42,7 @@ struct printbuf* printbuf_new(void)
     free(p);
     return NULL;
   }
+  p->buf[0]= '\0';
   return p;
 }