misc/152042: wrong bufsize of __hdtoa
>Number: 152042
>Category: misc
>Synopsis: wrong bufsize of __hdtoa
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Nov 08 09:40:06 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: Yui NARUSE
>Release: 8.1-RELEASE
>Organization:
>Environment:
FreeBSD windy.airemix.net 8.1-RELEASE FreeBSD 8.1-RELEASE #1: Sat Jul 24 11:27:04 JST 2010 naruse@windy.airemix.net:/usr/obj/usr/src/sys/GENERIC amd64
>Description:
When ndigits is given for __hdtoa, the bufsize for rv_alloc is too small.
It must add 1 for NUL termination.
>How-To-Repeat:
>Fix:
/usr/src/lib/libc/gdtoa % diff -u _hdtoa.c _hdtoa.c.orig
--- _hdtoa.c 2010-11-08 18:31:46.000000000 +0900
+++ _hdtoa.c.orig 2010-11-08 18:31:44.000000000 +0900
@@ -109,7 +109,7 @@
* enough space for all the digits.
*/
bufsize = (ndigits > 0) ? ndigits : SIGFIGS;
- s0 = rv_alloc(bufsize);
+ s0 = rv_alloc(bufsize+1);
/* Round to the desired number of digits. */
if (SIGFIGS > ndigits && ndigits > 0) {
>Release-Note:
>Audit-Trail:
>Unformatted:
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