From: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
To: "Gustavo A. R. Silva" <garsilva-L1vi/lXTdts+Va1GwOuvDg@public.gmane.org>
Cc: tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH] char: tmp: fix potential null pointer dereference
Date: Wed, 31 May 2017 15:11:29 +0300 [thread overview]
Message-ID: <20170531121129.f3576lq7peott6gd@intel.com> (raw)
In-Reply-To: <20170530215123.GA7484@embeddedgus>
On Tue, May 30, 2017 at 04:51:23PM -0500, Gustavo A. R. Silva wrote:
> NULL check at line 147: if (chip) {, implies chip might be NULL.
> Function dev_get_drvdata() dereference pointer chip.
> Move pointer priv assignment inside the IF block that checks
> pointer chip.
>
> Addresses-Coverity-ID: 1397646
> Signed-off-by: Gustavo A. R. Silva <garsilva-L1vi/lXTdts+Va1GwOuvDg@public.gmane.org>
It cannot be.
/Jarkko
> ---
> drivers/char/tpm/tpm_atmel.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/char/tpm/tpm_atmel.c b/drivers/char/tpm/tpm_atmel.c
> index 0d322ab..0826efd 100644
> --- a/drivers/char/tpm/tpm_atmel.c
> +++ b/drivers/char/tpm/tpm_atmel.c
> @@ -142,9 +142,10 @@ static struct platform_device *pdev;
> static void atml_plat_remove(void)
> {
> struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
> - struct tpm_atmel_priv *priv = dev_get_drvdata(&chip->dev);
> + struct tpm_atmel_priv *priv;
>
> if (chip) {
> + priv = dev_get_drvdata(&chip->dev);
> tpm_chip_unregister(chip);
> if (priv->have_region)
> atmel_release_region(priv->base, priv->region_size);
> --
> 2.5.0
>
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next prev parent reply other threads:[~2017-05-31 12:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-30 21:51 [PATCH] char: tmp: fix potential null pointer dereference Gustavo A. R. Silva
2017-05-31 12:11 ` Jarkko Sakkinen [this message]
[not found] ` <20170531121129.f3576lq7peott6gd-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-06-12 22:25 ` Gustavo A. R. Silva
2017-06-13 18:03 ` Jarkko Sakkinen
2017-06-13 19:55 ` [PATCH] char: tpm: remove unnecessary NULL check Gustavo A. R. Silva
2017-06-14 9:46 ` Jarkko Sakkinen
2017-06-19 0:35 ` Jarkko Sakkinen
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