[PATCH] platform/x86: intel_skl_int3472: Uninitialized variable in skl_int3472_handle_gpio_resources()

[PATCH] platform/x86: intel_skl_int3472: Uninitialized variable in skl_int3472_handle_gpio_resources()

[Dan Carpenter]

This function returns negative error codes, zero (to indicate that
everything has been completed successfully) and one (to indicate that
more resources need to be handled still).

This code prints an uninitialized error message when the function
returns one which potentially leads to an Oops.

Fixes: 5de691bffe57 ("platform/x86: Add intel_skl_int3472 driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 .../platform/x86/intel/int3472/intel_skl_int3472_discrete.c   | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/intel/int3472/intel_skl_int3472_discrete.c b/drivers/platform/x86/intel/int3472/intel_skl_int3472_discrete.c
index 17c6fe830765..9fe0a2527e1c 100644
--- a/drivers/platform/x86/intel/int3472/intel_skl_int3472_discrete.c
+++ b/drivers/platform/x86/intel/int3472/intel_skl_int3472_discrete.c
@@ -286,10 +286,10 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
 	int3472->ngpios++;
 	ACPI_FREE(obj);
 
-	if (ret)
+	if (ret < 0)
 		return dev_err_probe(int3472->dev, ret, err_msg);
 
-	return 0;
+	return ret;
 }
 
 static int skl_int3472_parse_crs(struct int3472_discrete_device *int3472)
-- 
2.30.2

Re: [PATCH] platform/x86: intel_skl_int3472: Uninitialized variable in skl_int3472_handle_gpio_resources()

[Daniel Scally]

Hi Dan, thanks for the patch

On 25/06/2021 14:01, Dan Carpenter wrote:
> This function returns negative error codes, zero (to indicate that
> everything has been completed successfully) and one (to indicate that
> more resources need to be handled still).
>
> This code prints an uninitialized error message when the function
> returns one which potentially leads to an Oops.


Ah! In the default case of the switch, took me a while to see that.
Thanks very much, good catch.


Reviewed-by: Daniel Scally <djrscally@gmail.com>

>
> Fixes: 5de691bffe57 ("platform/x86: Add intel_skl_int3472 driver")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
>  .../platform/x86/intel/int3472/intel_skl_int3472_discrete.c   | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/platform/x86/intel/int3472/intel_skl_int3472_discrete.c b/drivers/platform/x86/intel/int3472/intel_skl_int3472_discrete.c
> index 17c6fe830765..9fe0a2527e1c 100644
> --- a/drivers/platform/x86/intel/int3472/intel_skl_int3472_discrete.c
> +++ b/drivers/platform/x86/intel/int3472/intel_skl_int3472_discrete.c
> @@ -286,10 +286,10 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
>  	int3472->ngpios++;
>  	ACPI_FREE(obj);
>  
> -	if (ret)
> +	if (ret < 0)
>  		return dev_err_probe(int3472->dev, ret, err_msg);
>  
> -	return 0;
> +	return ret;
>  }
>  
>  static int skl_int3472_parse_crs(struct int3472_discrete_device *int3472)

Re: [PATCH] platform/x86: intel_skl_int3472: Uninitialized variable in skl_int3472_handle_gpio_resources()

[Hans de Goede]

Hi,

On 6/25/21 3:01 PM, Dan Carpenter wrote:
> This function returns negative error codes, zero (to indicate that
> everything has been completed successfully) and one (to indicate that
> more resources need to be handled still).
> 
> This code prints an uninitialized error message when the function
> returns one which potentially leads to an Oops.
> 
> Fixes: 5de691bffe57 ("platform/x86: Add intel_skl_int3472 driver")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Thank you for your patch, I've applied this patch to my review-hans 
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans



> ---
>  .../platform/x86/intel/int3472/intel_skl_int3472_discrete.c   | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel/int3472/intel_skl_int3472_discrete.c b/drivers/platform/x86/intel/int3472/intel_skl_int3472_discrete.c
> index 17c6fe830765..9fe0a2527e1c 100644
> --- a/drivers/platform/x86/intel/int3472/intel_skl_int3472_discrete.c
> +++ b/drivers/platform/x86/intel/int3472/intel_skl_int3472_discrete.c
> @@ -286,10 +286,10 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
>  	int3472->ngpios++;
>  	ACPI_FREE(obj);
>  
> -	if (ret)
> +	if (ret < 0)
>  		return dev_err_probe(int3472->dev, ret, err_msg);
>  
> -	return 0;
> +	return ret;
>  }
>  
>  static int skl_int3472_parse_crs(struct int3472_discrete_device *int3472)
>