linux-kernel - Re: [v2] platform/x86: ISST: fix use-after-free in tpmi_sst_dev

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Message-ID: <d73fe99b-dea3-4792-aa1c-c3317f296003@web.de>
Date: Mon, 20 May 2024 12:56:42 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>,
 platform-driver-x86@...r.kernel.org, kernel-janitors@...r.kernel.org,
 Hans de Goede <hdegoede@...hat.com>,
 Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
 Zhang Rui <rui.zhang@...el.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Dan Carpenter <dan.carpenter@...aro.org>, Dan Carpenter <error27@...il.com>
Subject: Re: [v2] platform/x86: ISST: fix use-after-free in
 tpmi_sst_dev_remove()

>> …
>>> Fix this by reordering the kfree() post the dereference.
>>
>> Would a wording approach (like the following) be a bit nicer?
>>
>>    Move a kfree() call behind an assignment statement in the affected if branch.
>
> No, the suggested wording would make it less precise ("post the
> dereference" -> "behind an assignment") and also tries to tell pointless
> things about the location in the codei that is visible in the patch itself.

Would you eventually like another wording variant a bit more?

    Thus move a kfree() call behind a dereference of an invalid pointer.


Regards,
Markus