Re: [Xen-devel] [PATCH] libxl: fix printing hotplug arguments/environment

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Aug 02, 2016 at 11:27:13AM +0200, Roger Pau Monne wrote:
> On Tue, Aug 02, 2016 at 10:13:42AM +0100, Wei Liu wrote:
> > On Mon, Aug 01, 2016 at 06:20:56PM +0200, Roger Pau Monne wrote:
> > > A OS could decide to not pass arguments or any environment variables to
> > 
> > "An"
> > 
> > > hotplug scripts, and this will trigger a bug in device_hotplug logic, 
> > > since
> > > it expects both the argument and the environment arrays to exist. Allow
> > > both args or env to be NULL.
> > > 
> > > Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> > > ---
> > > Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
> > > Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> > > ---
> > >  tools/libxl/libxl_device.c | 4 ++--
> > >  1 file changed, 2 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/tools/libxl/libxl_device.c b/tools/libxl/libxl_device.c
> > > index b9a6df2..0e5f546 100644
> > > --- a/tools/libxl/libxl_device.c
> > > +++ b/tools/libxl/libxl_device.c
> > > @@ -1132,7 +1132,7 @@ static void device_hotplug(libxl__egc *egc, 
> > > libxl__ao_device *aodev)
> > >  
> > >      LOG(DEBUG, "calling hotplug script: %s %s", args[0], args[1]);
> > >      LOG(DEBUG, "extra args:");
> > > -    {
> > > +    if ( args != NULL) {
> > 
> > Minor nit, extraneous space here.
> > 
> > Shouldn't this check be moved before the "calling hotplug script..."
> > line?
> 
> This one should be removed, args cannot be NULL or else we won't call 
> anything, and thus libxl__get_hotplug_script_info should return 0.
>  

OK, please update the patch commit message and content.

I will wait for v2.

> > >          const char *arg;
> > >          unsigned int x;
> > >  
> > > @@ -1140,7 +1140,7 @@ static void device_hotplug(libxl__egc *egc, 
> > > libxl__ao_device *aodev)
> > >              LOG(DEBUG, "\t%s", arg);
> > >      }
> > >      LOG(DEBUG, "env:");
> > > -    {
> > > +    if ( env != NULL) {
> > >          const char *k, *v;
> > >          unsigned int x;
> > >  
> > > -- 
> > > 2.7.4 (Apple Git-66)
> > > 

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel