Re: [tpmdd-devel] [PATCH] char: tpm: Add missing error check for devm_kzalloc

[Jason Gunthorpe <jgunthorpe@obsidianresearch.com>]

On Fri, Sep 19, 2014 at 12:44:39PM +0530, Kiran Padwal wrote:
> Currently these driver are missing a check on the return value of devm_kzalloc,
> which would cause a NULL pointer dereference in a OOM situation.
> 
> This patch adds a missing check for tpm_i2c_atmel.c and tpm_i2c_nuvoton.c

Yes, my bad, thank you:

Reviewed-By: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>

> Signed-off-by: Kiran Padwal <kiran.padwal@smartplayin.com>
>  drivers/char/tpm/tpm_i2c_atmel.c   |    4 ++++
>  drivers/char/tpm/tpm_i2c_nuvoton.c |    5 +++++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/drivers/char/tpm/tpm_i2c_atmel.c b/drivers/char/tpm/tpm_i2c_atmel.c
> index 7727292..503a85a 100644
> +++ b/drivers/char/tpm/tpm_i2c_atmel.c
> @@ -168,6 +168,10 @@ static int i2c_atmel_probe(struct i2c_client *client,
>  
>  	chip->vendor.priv = devm_kzalloc(dev, sizeof(struct priv_data),
>  					 GFP_KERNEL);
> +	if (!chip->vendor.priv) {
> +		rc = -ENOMEM;
> +		goto out_err;
> +	}
>  
>  	/* Default timeouts */
>  	chip->vendor.timeout_a = msecs_to_jiffies(TPM_I2C_SHORT_TIMEOUT);
> diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c
> index 7b158ef..23c7b13 100644
> +++ b/drivers/char/tpm/tpm_i2c_nuvoton.c
> @@ -538,6 +538,11 @@ static int i2c_nuvoton_probe(struct i2c_client *client,
>  
>  	chip->vendor.priv = devm_kzalloc(dev, sizeof(struct priv_data),
>  					 GFP_KERNEL);
> +	if (!chip->vendor.priv) {
> +		rc = -ENOMEM;
> +		goto out_err;
> +	}
> +
>  	init_waitqueue_head(&chip->vendor.read_queue);
>  	init_waitqueue_head(&chip->vendor.int_queue);
>