Re: [PATCH v4 3/5] drm: Add dispatcher and driver identification for DRM

["Dmitry V. Levin" <ldv@altlinux.org>]

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On Fri, Sep 11, 2015 at 12:57:06PM +0200, Patrik Jakobsson wrote:
> On Tue, Sep 08, 2015 at 03:36:25AM +0300, Dmitry V. Levin wrote:
> > On Mon, Aug 24, 2015 at 02:42:48PM +0200, Patrik Jakobsson wrote:
[...]
> > > +static char *drm_get_driver_name(struct tcb *tcp)
> > > +{
> > > +	char path[PATH_MAX];
> > > +	char link[PATH_MAX];
> > > +	int ret;
> > > +
> > > +	if (getfdpath(tcp, tcp->u_arg[0], path, PATH_MAX - 1) < 0)
> > > +		return NULL;
> > > +
> > > +	snprintf(link, PATH_MAX, "/sys/class/drm/%s/device/driver",
> > > +		 basename(path));
> > 
> > if (snprintf(link, sizeof(link), ...) >= sizeof(link))
> > 	return NULL;
> > 
> 
> According to manpage snprintf never returns more than the specified size - 1.

Really?

"The functions snprintf() and vsnprintf() do not write more than size
bytes (including the terminating null byte ('\0')).  If the output was
truncated due to this limit, then the return value is the number of
characters (excluding the terminating null byte) which would have been
written to the final string if enough space had been available.  Thus,
a return value of size or more means that the output was truncated."


-- 
ldv

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