Re: BUG #18943: Return value of a function 'xmlBufferCreate' isdereferenced at xpath.c:177 without checking for NUL

Michael Paquier <michael@paquier.xyz>

From: Michael Paquier <michael@paquier.xyz>

To: cca5507 <cca5507@qq.com>

Cc: Jim Jones <jim.jones@uni-muenster.de>, Tom Lane <tgl@sss.pgh.pa.us>, pgsql-bugs <pgsql-bugs@lists.postgresql.org>, maralist86 <maralist86@mail.ru>

Date: 2026-03-09T07:31:37Z

Lists: pgsql-bugs

On Sun, Mar 08, 2026 at 11:05:32PM +0800, cca5507 wrote:
> Attach a small patch.

You are right, this needs to consider the pointer variable as
volatile, as done in your patch, and not treat as volatile what is
pointed at.  This comes from 2e947217474c, as of HEAD.  I'll take care
of it later.  The same business has been fixed in xml2 as of
93001888d85c. 
--
Michael

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

xml2: Fix failure with xslt_process() under -fsanitize=undefined
- 70f7c5badcc0 14.23 landed
- 0b0041b942f7 15.18 landed
- 5f46c617e95f 16.14 landed
- 63aa4342da23 17.10 landed
- e33a4fda0027 18.4 landed
- 7d64419f8073 19 (unreleased) landed
Fix misuse of "volatile" in xml.c
- 6307b096e259 19 (unreleased) landed
xml2: Improve error handling of libxml2 calls
- 732061150b00 19 (unreleased) landed
Improve error handling of libxml2 calls in xml.c
- 2e947217474c 19 (unreleased) landed