linux-kernel - Re: [PATCH v2] crypto: omap-sham: Check for return value from pm_runtime_get

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Date:	Thu, 14 May 2015 23:40:37 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Benoît Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Rob Herring <robh+dt@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	Paul Walmsley <paul@...an.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	Pavel Machek <pavel@....cz>, Nishanth Menon <nm@...com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Sebastian Reichel <sre@...nel.org>
Subject: Re: [PATCH v2] crypto: omap-sham: Check for return value from pm_runtime_get_sync

On Sunday 08 March 2015 11:01:01 Pali Rohár wrote:
> Function pm_runtime_get_sync could fail and we need to check return
> value to prevent kernel crash.
> 
> Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> ---
> v2: Check return value for all pm_runtime_get_sync() calls
> ---
>  drivers/crypto/omap-sham.c |   23 ++++++++++++++++++++---
>  1 file changed, 20 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
> index b20e374..c5df53d 100644
> --- a/drivers/crypto/omap-sham.c
> +++ b/drivers/crypto/omap-sham.c
> @@ -362,7 +362,13 @@ static void omap_sham_copy_ready_hash(struct
> ahash_request *req)
> 
>  static int omap_sham_hw_init(struct omap_sham_dev *dd)
>  {
> -	pm_runtime_get_sync(dd->dev);
> +	int err;
> +
> +	err = pm_runtime_get_sync(dd->dev);
> +	if (err < 0) {
> +		dev_err(dd->dev, "failed to get sync: %d\n", err);
> +		return err;
> +	}
> 
>  	if (!test_bit(FLAGS_INIT, &dd->flags)) {
>  		set_bit(FLAGS_INIT, &dd->flags);
> @@ -1949,7 +1955,13 @@ static int omap_sham_probe(struct
> platform_device *pdev) dd->flags |= dd->pdata->flags;
> 
>  	pm_runtime_enable(dev);
> -	pm_runtime_get_sync(dev);
> +
> +	err = pm_runtime_get_sync(dev);
> +	if (err < 0) {
> +		dev_err(dev, "failed to get sync: %d\n", err);
> +		goto err_pm;
> +	}
> +
>  	rev = omap_sham_read(dd, SHA_REG_REV(dd));
>  	pm_runtime_put_sync(&pdev->dev);
> 
> @@ -1979,6 +1991,7 @@ err_algs:
>  		for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
>  			crypto_unregister_ahash(
>  					&dd->pdata->algs_info[i].algs_list[j]);
> +err_pm:
>  	pm_runtime_disable(dev);
>  	if (dd->dma_lch)
>  		dma_release_channel(dd->dma_lch);
> @@ -2021,7 +2034,11 @@ static int omap_sham_suspend(struct device
> *dev)
> 
>  static int omap_sham_resume(struct device *dev)
>  {
> -	pm_runtime_get_sync(dev);
> +	int err = pm_runtime_get_sync(dev);
> +	if (err < 0) {
> +		dev_err(dev, "failed to get sync: %d\n", err);
> +		return err;
> +	}
>  	return 0;
>  }
>  #endif

Herbert, can you apply this patch?

-- 
Pali Rohár
pali.rohar@...il.com

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