linux-kernel - Re: [PATCH] livepatch: Fix leak on klp_init_patch

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Message-ID: <YbmlL0ZyfSuek9OB@alley>
Date:   Wed, 15 Dec 2021 09:19:59 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     David Vernet <void@...ifault.com>, Miroslav Benes <mbenes@...e.cz>,
        linux-doc@...r.kernel.org, live-patching@...r.kernel.org,
        linux-kernel@...r.kernel.org, jpoimboe@...hat.com,
        jikos@...nel.org, joe.lawrence@...hat.com, corbet@....net,
        yhs@...com, songliubraving@...com
Subject: Re: [PATCH] livepatch: Fix leak on klp_init_patch_early failure path

On Tue 2021-12-14 16:50:15, Greg Kroah-Hartman wrote:
> 
> kobject_init() does allocate things internally, where does it say it
> does not?  What is trying to be "fixed" here?

Could you please show where things are allocated in kobject_init()?
I do not see it in the code!

It looks to me like a cargo cult claim to me.

Documentation/core-api/kobject.rst says:

   Once you registered your kobject via kobject_add(), you must never use
   kfree() to free it directly. The only safe way is to use kobject_put().

kobject_add() makes perfect sense because it copies the name, takes
reference to the parent, etc.

kobject_init() just initializes the structure members and nothing else.

Best Regards,
Petr