Re: [PATCH 1/7] usb: misc: usbtest: allocate size of urb array according to user parameter

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On Mon, 2015-08-31 at 13:01 +0200, Michal Nazarewicz wrote:
> On Fri, Aug 28 2015, Peter Chen wrote:
> > Allocate the size of urb pointer array according to testusb's
> > parameter sglen.
> >
> > Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
> 
> Acked-by: Michal Nazarewicz <mina86@xxxxxxxxxx>
> 
> I vaguely recall that LLVM fans got mad last time I used dynamically
> sized local arrays though.  Not sure though, I may be misremembering
> things.
> 
> > ---
> >  drivers/usb/misc/usbtest.c | 5 +----
> >  1 file changed, 1 insertion(+), 4 deletions(-)
> >
> > diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
> > index 9517812..9cdb4ad 100644
> > --- a/drivers/usb/misc/usbtest.c
> > +++ b/drivers/usb/misc/usbtest.c
> > @@ -1911,10 +1911,7 @@ test_iso_queue(struct usbtest_dev *dev,
> struct usbtest_param *param,
> >       unsigned                i;
> >       unsigned long           packets = 0;
> >       int                     status = 0;
> > -     struct urb              *urbs[10];      /* FIXME no limit */
> > -
> > -     if (param->sglen > 10)
> > -             return -EDOM;
> > +     struct urb              *urbs[param->sglen];

This goes onto the stack. Do you have any limit on sglen?

	Regards
		Oliver


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