linux-kernel - Re: [PATCH] fsi: Aspeed: Fix a potential double free

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Message-ID: <20220106081418.GH7674@kadam>
Date:   Thu, 6 Jan 2022 11:14:19 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Christophe JAILLET <christophe.jaillet@...adoo.fr>, jk@...abs.org,
        joel@....id.au, alistair@...ple.id.au, eajames@...ux.ibm.com,
        andrew@...id.au, linux-fsi@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] fsi: Aspeed: Fix a potential double free

On Mon, Dec 27, 2021 at 07:29:07AM +0100, Greg KH wrote:
> On Sun, Dec 26, 2021 at 05:56:02PM +0100, Christophe JAILLET wrote:
> > 'aspeed' is a devm_alloc'ed, so there is no need to free it explicitly or
> > there will be a double free().
> 
> A struct device can never be devm_alloced for obvious reasons.  Perhaps
> that is the real problem here?
> 

I don't understand how "aspeed" is a struct device.

I've been working on understanding device managed memory recently for
Smatch.  It's really complicated.  There are a bunch of rules/heuristics
that I'm slowly creating to generate new warnings but I'm a long way
from understanding it well myself.

regards,
dan carpenter