Re: [PATCH -next] usb: gadget: dereference before null check

[Sebin Sebastian]

On Wed, Jun 29, 2022 at 10:24:07AM +0200, Greg Kroah-Hartman wrote:
> On Wed, Jun 29, 2022 at 01:37:25PM +0530, SebinSebastian wrote:
> > Fix coverity warning dereferencing before null check. _ep and desc is
> > dereferenced on all paths until the check for null. Move the
> > initializations after the check for null.
> > Coverity issue: 1518209
> > 
> > Signed-off-by: SebinSebastian <mailmesebin00@xxxxxxxxx>
> > ---
> >  drivers/usb/gadget/udc/aspeed_udc.c | 9 +++++----
> >  1 file changed, 5 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/usb/gadget/udc/aspeed_udc.c b/drivers/usb/gadget/udc/aspeed_udc.c
> > index d75a4e070bf7..96f8193fca15 100644
> > --- a/drivers/usb/gadget/udc/aspeed_udc.c
> > +++ b/drivers/usb/gadget/udc/aspeed_udc.c
> > @@ -341,10 +341,6 @@ static void ast_udc_stop_activity(struct ast_udc_dev *udc)
> >  static int ast_udc_ep_enable(struct usb_ep *_ep,
> >  			     const struct usb_endpoint_descriptor *desc)
> >  {
> > -	u16 maxpacket = usb_endpoint_maxp(desc);
> > -	struct ast_udc_ep *ep = to_ast_ep(_ep);
> > -	struct ast_udc_dev *udc = ep->udc;
> > -	u8 epnum = usb_endpoint_num(desc);
> >  	unsigned long flags;
> >  	u32 ep_conf = 0;
> >  	u8 dir_in;
> > @@ -356,6 +352,11 @@ static int ast_udc_ep_enable(struct usb_ep *_ep,
> >  		return -EINVAL;
> >  	}
> > 
> > +	u16 maxpacket = usb_endpoint_maxp(desc);
> > +	struct ast_udc_ep *ep = to_ast_ep(_ep);
> > +	struct ast_udc_dev *udc = ep->udc;
> > +	u8 epnum = usb_endpoint_num(desc);
> > +
> >  	if (!udc->driver) {
> >  		EP_DBG(ep, "bogus device state\n");
> >  		return -ESHUTDOWN;
> > --
> > 2.34.1
> > 
> 
> Hi,
> 
> This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
> a patch that has triggered this response.  He used to manually respond
> to these common problems, but in order to save his sanity (he kept
> writing the same thing over and over, yet to different people), I was
> created.  Hopefully you will not take offence and will fix the problem
> in your patch and resubmit it so that it can be accepted into the Linux
> kernel tree.
> 
> You are receiving this message because of the following common error(s)
> as indicated below:
> 
> - Your patch breaks the build.
> 
> - Your patch contains warnings and/or errors noticed by the
>   scripts/checkpatch.pl tool.
> 
> - This looks like a new version of a previously submitted patch, but you
>   did not list below the --- line any changes from the previous version.
>   Please read the section entitled "The canonical patch format" in the
>   kernel file, Documentation/SubmittingPatches for what needs to be done
>   here to properly describe this.
> 
> If you wish to discuss this problem further, or you have questions about
> how to resolve this issue, please feel free to respond to this email and
> Greg will reply once he has dug out from the pending patches received
> from other developers.
> 
> thanks,
> 
> greg k-h's patch email bot

I am sorry to keep on bothering with this incorrect patches. I am
running the checkpatch script everytime before I sent any patches. It is
not showing any warnings or errors. Is it because of my name that my
patches are getting rejected? I can see a space missing.