linux-kernel - Re: [PATCH] crypto: tegra - Remove an incorrect iommu_fwspec_free() call in tegra_se

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Fri, 31 May 2024 13:23:18 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Akhil R <akhilrajeev@...dia.com>
Cc: Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	"David S. Miller" <davem@...emloft.net>,
	Thierry Reding <thierry.reding@...il.com>,
	Jon Hunter <jonathanh@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH] crypto: tegra - Remove an incorrect iommu_fwspec_free()
 call in tegra_se_remove()

On Wed, May 29, 2024 at 06:53:42AM +0000, Akhil R wrote:
> > The only iommu function call in this driver is a
> > tegra_dev_iommu_get_stream_id() which does not allocate anything and does
> > not take any reference.
> > 
> > More-over, what is freed is "se->dev" which has been devm_kzalloc()'ed in the
> > probe.
> 
> I did not completely understand what is being tried to convey here.
> If I understand it right, iommu_fwspec_free() does not do anything
> with the "devm_kzalloc"ed variable. 
> 
> It would probably be a good idea to remove this line from the commit message.

I think he means that as the memory was allocated via devm, it will
be automatically freed by the kernel and the driver does not need
to (and should not) free the memory by hand.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt