linux-kernel - Re: [PATCH next] tpm: Fix a possible dereference of ERR_PTR in tpm

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Message-ID: <20230329215921.2yjebtrscuo66km2@kernel.org>
Date:   Thu, 30 Mar 2023 00:59:21 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>,
        error27@...il.com, Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH next] tpm: Fix a possible dereference of ERR_PTR in
 tpm_init()

On Tue, Mar 21, 2023 at 09:01:08AM +0100, Greg Kroah-Hartman wrote:
> On Mon, Mar 20, 2023 at 11:14:15PM -0700, Harshit Mogalapalli wrote:
> > Smatch reports:
> > 	drivers/char/tpm/tpm-interface.c:470 tpm_init() error:
> > 	'tpm_class' dereferencing possible ERR_PTR()
> > 
> > If class_create() returns error pointer, we are dereferencing a possible
> > error pointer. Fix this by moving the dereference post error handling.
> > 
> > Fixes: a010eb881243 ("tpm: fix up the tpm_class shutdown_pre pointer when created")
> > Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
> > ---
> > This is based on static analysis, only compile tested.
> 
> Thanks for this, good catch, I've queued it up in my tree now as I have
> the offending change that caused this.

OK, thank you!

BR, Jarkko