On Sat, Nov 17, 2012 at 06:48:55PM +0100, walter harms wrote: > > > Am 17.11.2012 16:06, schrieb Dan Carpenter: > > If param->length is zero, then this could lead to a divide by zero bug > > later in the function when we do: size %= max; > > > > Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> > > > > diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c > > index f10bd97..7667b12 100644 > > --- a/drivers/usb/misc/usbtest.c > > +++ b/drivers/usb/misc/usbtest.c > > @@ -423,6 +423,9 @@ alloc_sglist(int nents, int max, int vary) > > unsigned i; > > unsigned size = max; > > > > + if (max == 0) > > + return NULL; > > + > > maybe you should be more defensive and check from (max <= 0) > Nah... Testing for == 0 is ok. regards, dan carpenter -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
