Messages in this thread | | | Date | Mon, 10 Sep 2007 18:33:07 +0200 | From | Jens Axboe <> | Subject | Re: [PATCH] Remove pointless NULL pointer check in drivers/usb/storage/shuttle_usbat.c. |
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On Fri, Sep 07 2007, Simon Holm Thøgersen wrote: > tir, 04 09 2007 kl. 23:06 +0200, skrev Jens Axboe: > > On Tue, Sep 04 2007, Simon Holm Thøgersen wrote: > > > tir, 04 09 2007 kl. 13:06 +0200, skrev Jens Axboe: > > > > On Tue, Sep 04 2007, Micah Gruber wrote: > > > > > This patch fixes a potential null dereference bug where we dereference us before a null check. This patch simply moves the dereferencing after the null check. > > > > > > > > > > Signed-off-by: Micah Gruber <micah.gruber@gmail.com> > > > > > > > > Be careful with stuff like that, if you actually look at the code, a us > > > > == NULL doesn't seem to be possible (or usbat_flash_transport() would > > > > have oopsed before). > > > > > > > If that is true, then > > > if (!us) > > > return USB_STOR_TRANSPORT_ERROR; > > > is utterly pointless. > > > > Well that was the point I was trying to make, that test and return > > should be deleted instead. > > > I guess we agree that we want the following then. > > > If us would ever be NULL, the function would have oopsed already before > the check.
Yep, looks much better.
Acked-by: Jens Axboe <jens.axboe@oracle.com>
> > Signed-off-by: Simon Holm Thøgersen <odie@cs.aau.dk> > --- > > --- a/drivers/usb/storage/shuttle_usbat.c > +++ b/drivers/usb/storage/shuttle_usbat.c > @@ -190,9 +190,6 @@ static int usbat_check_status(struct us_data *us) > unsigned char *reply = us->iobuf; > int rc; > > - if (!us) > - return USB_STOR_TRANSPORT_ERROR; > - > rc = usbat_get_status(us, reply); > if (rc != USB_STOR_XFER_GOOD) > return USB_STOR_TRANSPORT_FAILED; > >
-- Jens Axboe
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