linux-kernel - Re: [PATCH] memstick: Fix memory leak in memstick

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Date:	Mon, 7 Oct 2013 09:48:48 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	Alex Dubov <oakad@...oo.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kay Sievers <kay.sievers@...y.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH] memstick: Fix memory leak in memstick_check() error
 path

On Mon, Oct 07, 2013 at 01:02:43AM +0100, Larry Finger wrote:
> On 10/04/2013 03:54 AM, Catalin Marinas wrote:
> > On 3 October 2013 22:13, Larry Finger <Larry.Finger@...inger.net> wrote:
> >> diff --git a/drivers/memstick/core/memstick.c b/drivers/memstick/core/memstick.c
> >> index ffcb10a..0c73a45 100644
> >> --- a/drivers/memstick/core/memstick.c
> >> +++ b/drivers/memstick/core/memstick.c
> >> @@ -415,6 +415,7 @@ static struct memstick_dev *memstick_alloc_card(struct memstick_host *host)
> >>          return card;
> >>   err_out:
> >>          host->card = old_card;
> >> +       kfree(card->dev.kobj.name);
> >
> > It looks weird to go into dev.kobj internals here for freeing the
> > name. There is also memstick_free_card() which doesn't seem to do
> > anything about the name freeing.
> >
> > Should memstick_alloc_card() do a device_initialise(&card->dev) and in
> > memstick_free_card() (or the error path) do a put_device(&card->dev)?
> > This should take care of kobj.name as well via kobject_put().
> 
> I tried several code changes that included adding a device_initialize() call, 
> but all of them oopsed even when I followed the examples in other drivers. 
> Adding a put_device() without the device_initialize() did not oops, but it still 
> leaked the name.
> 
> We could avoid going into the dev.kobj internals if a device_free_name() routine 
> existed as a companion to dev_set_name().

device_free_name() wouldn't be a bad idea.

-- 
Catalin
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