linux-kernel - Re: [PATCH v2] tpm: Fix null pointer dereference on chip register error path

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Date:   Mon, 08 Jul 2019 17:44:28 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Milan Broz <gmazyland@...il.com>
Cc:     peterhuewe@....de, jgg@...pe.ca, arnd@...db.de,
        gregkh@...uxfoundation.org, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2] tpm: Fix null pointer dereference on chip register
 error path

On Mon, 2019-07-08 at 17:34 +0300, Jarkko Sakkinen wrote:
> On Thu, 2019-07-04 at 09:26 +0200, Milan Broz wrote:
> > If clk_enable is not defined and chip initialization
> > is canceled code hits null dereference.
> > 
> > Easily reproducible with vTPM init fail:
> >   swtpm chardev --tpmstate dir=nonexistent_dir --tpm2 --vtpm-proxy
> > 
> > BUG: kernel NULL pointer dereference, address: 00000000
> > ...
> > Call Trace:
> >  tpm_chip_start+0x9d/0xa0 [tpm]
> >  tpm_chip_register+0x10/0x1a0 [tpm]
> >  vtpm_proxy_work+0x11/0x30 [tpm_vtpm_proxy]
> >  process_one_work+0x214/0x5a0
> >  worker_thread+0x134/0x3e0
> >  ? process_one_work+0x5a0/0x5a0
> >  kthread+0xd4/0x100
> >  ? process_one_work+0x5a0/0x5a0
> >  ? kthread_park+0x90/0x90
> >  ret_from_fork+0x19/0x24
> > 
> > Fixes: 719b7d81f204 ("tpm: introduce tpm_chip_start() and tpm_chip_stop()")
> > Cc: stable@...r.kernel.org # v5.1+
> > Signed-off-by: Milan Broz <gmazyland@...il.com>
> 
> Looks legit.
> 
> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

Please check master and next branches from

  git://git.infradead.org/users/jjs/linux-tpmdd.git

/Jarkko