linux-kernel - Re: [PATCHv3 2/3] kernel: add support for live patching

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Date:	Fri, 21 Nov 2014 15:44:35 +0100 (CET)
From:	Miroslav Benes <mbenes@...e.cz>
To:	Jiri Kosina <jkosina@...e.cz>
cc:	Seth Jennings <sjenning@...hat.com>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Steven Rostedt <rostedt@...dmis.org>,
	Petr Mladek <pmladek@...e.cz>,
	Christoph Hellwig <hch@...radead.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	live-patching@...r.kernel.org, x86@...nel.org, kpatch@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 2/3] kernel: add support for live patching

On Fri, 21 Nov 2014, Jiri Kosina wrote:

[...]

> [ ... snip ... ]
> > +static int klp_init_patch(struct klp_patch *patch)
> > +{
> > +	int ret;
> > +
> > +	mutex_lock(&klp_mutex);
> > +
> > +	/* init */
> > +	patch->state = LPC_DISABLED;
> > +
> > +	/* sysfs */
> > +	ret = kobject_init_and_add(&patch->kobj, &klp_ktype_patch,
> > +				   klp_root_kobj, patch->mod->name);
> > +	if (ret)
> > +		return ret;
> 
> klp_mutex is leaked locked here.
> 
> > +
> > +	/* create objects */
> > +	ret = klp_init_objects(patch);
> > +	if (ret) {
> > +		kobject_put(&patch->kobj);
> > +		return ret;
> 
> And here as well.
> 
> All in all, this is looking very good to me. I think we are really close 
> to having a code that all the parties would agree with. Thanks everybody,

The leaking is my fault. I missed that somehow during rebasing.

Seth, could you please fix it in v4? 

Thanks
--
Miroslav Benes
SUSE Labs
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