[Libguestfs] [PATCH 1/3] launch: add internal helper for socket paths creation
Pino Toscano
ptoscano at redhat.com
Wed Feb 3 09:35:07 UTC 2016
On Tuesday 02 February 2016 19:47:12 Richard W.M. Jones wrote:
> On Tue, Feb 02, 2016 at 03:27:39PM +0100, Pino Toscano wrote:
> > diff --git a/src/launch.c b/src/launch.c
> > index f59818f..ec061e3 100644
> > --- a/src/launch.c
> > +++ b/src/launch.c
> > @@ -418,6 +418,21 @@ guestfs_int_get_cpu_model (int kvm)
> > #endif
> > }
> >
> > +/* Create the path for a socket with the selected filename in the
> > + * tmpdir.
> > + */
> > +int
> > +guestfs_int_create_socketname (guestfs_h *g, const char *filename,
> > + char (*sockpath)[UNIX_PATH_MAX])
> > +{
> > + char *path = g->tmpdir;
> > +
> > + snprintf (*sockpath, UNIX_PATH_MAX-1, "%s/%s", path, filename);
> > + (*sockpath)[UNIX_PATH_MAX-1] = '\0';
>
> What's wrong with:
>
> snprintf (*sockpath, UNIX_PATH_MAX, "%s/%s", path, filename);
If the "$path/$filename" string is longer than UNIX_PATH_MAX, then
*sockpath won't be 0-terminated. Since the line after that always
puts 0 at the end, we can just save one character.
The truncation of long paths always happens with this patch, and that
is what patch #3 addresses.
--
Pino Toscano
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