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

[Greg Kroah-Hartman]

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 at gmail.com>
> ---
>  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
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