linux-kernel - Re: [PATCH][V2] usb: isp1760: fix null dereference if kzalloc returns null

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Message-ID: <556C6362.1010700@cogentembedded.com>
Date:	Mon, 01 Jun 2015 16:51:30 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Colin King <colin.king@...onical.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Felipe Balbi <balbi@...com>,
	Sudeep Holla <sudeep.holla@....com>, linux-usb@...r.kernel.org
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][V2] usb: isp1760: fix null dereference if kzalloc returns
 null

Hello.

On 6/1/2015 1:43 AM, Colin King wrote:

> From: Colin Ian King <colin.king@...onical.com>

> If kzalloc returns null then isp1760_ep_alloc_request performs
> a null pointer dereference on req. Check for null to avoid this.

    I told you there's no dereference and yet you're repeating it again. :-(

> Detected with smatch static analysis:

> drivers/usb/isp1760/isp1760-udc.c:816 isp1760_ep_alloc_request()
>    error: potential null dereference 'req'.  (kzalloc returns null)

> Signed-off-by: Colin Ian King <colin.king@...onical.com>

WBR, Sergei

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