[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <Y7v5zP5FDkeGpv4D@smile.fi.intel.com>
Date: Mon, 9 Jan 2023 13:26:04 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Sergey Shtylyov <s.shtylyov@....ru>
Cc: Petr Mladek <pmladek@...e.com>,
Steven Rostedt <rostedt@...dmis.org>,
Sergey Senozhatsky <senozhatsky@...omium.org>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vsprintf: fix possible NULL pointer deref in vsnprintf()
On Mon, Jan 09, 2023 at 01:23:40PM +0200, Andy Shevchenko wrote:
> On Fri, Jan 06, 2023 at 12:16:31AM +0300, Sergey Shtylyov wrote:
...
> > + /*
> > + * C99 allows @buf to be NULL when @size is 0. We treat such NULL as if
> > + * @buf pointed to 0-sized buffer, so we can both avoid a NULL pointer
> > + * dereference and still return # of characters that would be written
> > + * if @buf pointed to a valid buffer...
> > + */
> > + if (!buf)
> > + size = 0;
>
> Do we have test cases for that?
This still stays...
> And what's wrong to print "(null)" ? Have you checked if your patch makes any
> regressions to those cases?
...but this paragraph is not for the case (I mixed it with the arguments to be
NULL).
--
With Best Regards,
Andy Shevchenko
Powered by blists - more mailing lists