linux-kernel - Re: [PATCH] USB: fix possible memory leak in pxa27x

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Date:	Mon, 23 Jun 2008 15:38:12 -0700
From:	David Brownell <david-b@...bell.net>
To:	Marcin Slusarz <marcin.slusarz@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Daniel Marjamäki <danielm77@...ay.se>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH] USB: fix possible memory leak in pxa27x_udc

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
> 


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