linux-kernel - Re: [PATCH v13 04/12] livepatch: Consolidate klp

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Message-ID: <20181018114055.zxusn2w3lt6xx6fk@pathway.suse.cz>
Date:   Thu, 18 Oct 2018 13:40:55 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Jiri Kosina <jikos@...nel.org>, Miroslav Benes <mbenes@...e.cz>,
        Jason Baron <jbaron@...mai.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Evgenii Shatokhin <eshatokhin@...tuozzo.com>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jessica Yu <jeyu@...nel.org>
Subject: Re: [PATCH v13 04/12] livepatch: Consolidate klp_free functions

On Wed 2018-10-17 13:22:54, Josh Poimboeuf wrote:
> On Mon, Oct 15, 2018 at 02:37:05PM +0200, Petr Mladek wrote:
> > @@ -637,6 +647,7 @@ static int klp_init_patch(struct klp_patch *patch)
> >  	mutex_lock(&klp_mutex);
> >  
> >  	patch->enabled = false;
> > +	INIT_LIST_HEAD(&patch->list);
> 
> Is this a bug fix?  If so, it should go in a separate patch.  I'm
> wondering how this worked before.

It is not a bug fix. It was not needed before because
klp_register_patch() did not checked this field when failed.

But this patch started to use the generic
klp_free_patch_start()/klp_free_patch_finish() in both
klp_unregister_patch() and in klp_init_patch() error patch.
Therefore we need to have a valid value from the beginning.

Best Regards,
Petr