linux-kernel - Re: [PATCH] [media] s2255drv: fix memory leak s2255

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Message-ID: <20140508112106.GH8753@valkosipuli.retiisi.org.uk>
Date:	Thu, 8 May 2014 14:21:06 +0300
From:	Sakari Ailus <sakari.ailus@....fi>
To:	DaeSeok Youn <daeseok.youn@...il.com>
Cc:	m.chehab@...sung.com, linux-dev@...soray.com,
	hans.verkuil@...co.com, linux-media@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [media] s2255drv: fix memory leak s2255_probe()

On Wed, May 07, 2014 at 01:38:58PM +0900, DaeSeok Youn wrote:
> Hello,
> 
> 2014-05-05 17:38 GMT+09:00 Sakari Ailus <sakari.ailus@....fi>:
> > On Tue, Apr 15, 2014 at 07:54:43PM +0900, DaeSeok Youn wrote:
> >> Hi, Sakari
> >>
> >> 2014-04-15 18:33 GMT+09:00 Sakari Ailus <sakari.ailus@....fi>:
> >> > Hi Daeseok,
> >> >
> >> > On Tue, Apr 15, 2014 at 01:49:34PM +0900, Daeseok Youn wrote:
> >> >>
> >> >> smatch says:
> >> >>  drivers/media/usb/s2255/s2255drv.c:2246 s2255_probe() warn:
> >> >> possible memory leak of 'dev'
> >> >>
> >> >> Signed-off-by: Daeseok Youn <daeseok.youn@...il.com>
> >> >> ---
> >> >>  drivers/media/usb/s2255/s2255drv.c |    1 +
> >> >>  1 files changed, 1 insertions(+), 0 deletions(-)
> >> >>
> >> >> diff --git a/drivers/media/usb/s2255/s2255drv.c b/drivers/media/usb/s2255/s2255drv.c
> >> >> index 1d4ba2b..8aca3ef 100644
> >> >> --- a/drivers/media/usb/s2255/s2255drv.c
> >> >> +++ b/drivers/media/usb/s2255/s2255drv.c
> >> >> @@ -2243,6 +2243,7 @@ static int s2255_probe(struct usb_interface *interface,
> >> >>       dev->cmdbuf = kzalloc(S2255_CMDBUF_SIZE, GFP_KERNEL);
> >> >>       if (dev->cmdbuf == NULL) {
> >> >>               s2255_dev_err(&interface->dev, "out of memory\n");
> >> >> +             kfree(dev);
> >> >>               return -ENOMEM;
> >> >>       }
> >> >>
> >> >
> >> > The rest of the function already uses goto and labels for error handling. I
> >> > think it'd take adding one more. dev is correctly released in other error
> >> > cases.
> >> I am not sure that adding a new label for error handling when
> >> allocation for dev->cmdbuf is failed.
> >> I think it is ok to me. :-) Because I think it is not good adding a
> >> new label and use goto statement for this.
> >
> > I can ack this if you use the same pattern for error handling that's already
> > there.
> But it has a redundant kfree() call for dev->cmdbuf when it failed to
> allocate, right?

Correct.

> If it is ok, I send this again after fixing as your comment.

Please do. Thanks.

-- 
Sakari Ailus
e-mail: sakari.ailus@....fi	XMPP: sailus@...iisi.org.uk
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