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

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Message-ID: <CAHb8M2D5C-w3+_gWHOnJRXnjwMhtMYKNLnQwtX3wuGXZN=heng@mail.gmail.com>
Date:	Wed, 7 May 2014 13:38:58 +0900
From:	DaeSeok Youn <daeseok.youn@...il.com>
To:	Sakari Ailus <sakari.ailus@....fi>
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()

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

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