Re: [PATCH] USB: fix possible memory leak in pxa27x_udc

[David Brownell <david-b@pacbell.net>]

On Sunday 22 June 2008, Marcin Slusarz wrote:

> --- a/drivers/usb/gadget/pxa27x_udc.c
> +++ b/drivers/usb/gadget/pxa27x_udc.c
> @@ -650,8 +650,11 @@ pxa_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
>  {
>  	struct pxa27x_request *req;
>  
> +	if (!_ep)
> +		return NULL;
> +

Correct enough as it goes, except that it *can't* be null by virtue
of how it's called.  See <include/linux/usb/gadget.h> for:

static inline struct usb_request *usb_ep_alloc_request(struct usb_ep *ep,
                                                       gfp_t gfp_flags)
{
        return ep->ops->alloc_request(ep, gfp_flags);
}

If it were null it couldn't get here.  A better fix would just
remove the null check here (and possibly elsewhere).

- Dave


>  	req = kzalloc(sizeof *req, gfp_flags);
> -	if (!req || !_ep)
> +	if (!req)
>  		return NULL;
>  
>  	INIT_LIST_HEAD(&req->queue);
> -- 
> 1.5.4.5
>