linux-kernel - Re: [PATCH][V3] usb: isp1760: check for null return from kzalloc

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Message-ID: <20150608212206.GA16448@kroah.com>
Date:	Mon, 8 Jun 2015 14:22:06 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	Colin King <colin.king@...onical.com>, Felipe Balbi <balbi@...com>,
	Sudeep Holla <sudeep.holla@....com>,
	Valentin Rothberg <Valentin.Rothberg@...6.fr>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][V3] usb: isp1760: check for null return from kzalloc

On Wed, Jun 03, 2015 at 03:43:23AM +0300, Laurent Pinchart wrote:
> Hi Colin,
> 
> Thank you for the patch.
> 
> On Tuesday 02 June 2015 19:05:13 Colin King wrote:
> > From: Colin Ian King <colin.king@...onical.com>
> > 
> > isp1760_ep_alloc_request allocates a structure with kzalloc without checking
> > for NULL and then returns a pointer to one of the structure fields. As the
> > field happens to be the first in the structure the caller can properly
> > check for NULL, but this is risky if the structure layout is changed later.
> > Add an explicit NULL check for the kzalloc return value
> > 
> > Detected with smatch static analysis:
> > 
> > drivers/usb/isp1760/isp1760-udc.c:816 isp1760_ep_alloc_request()
> >   error: potential null dereference 'req'.  (kzalloc returns null)
> > 
> > [ thanks to Laurent Pinchart for improved commit message ]
> > 
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> 
> Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> 
> Felipe, I expect you to pick this up, please let me know if there's any issue.

I'll just take it directly, thanks.

greg k-h
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