[2/5] platform/x86: dell-ddv: Return error if buffer is empty

Message ID 20230126194021.381092-3-W_Armin@gmx.de
State New
Headers
Series platform/x86: dell-ddv: Various driver updates |

Commit Message

Armin Wolf Jan. 26, 2023, 7:40 p.m. UTC
  In several cases, the DDV WMI interface can return buffers
with a length of zero. Return -ENODATA in such a case for
proper error handling. Also replace some -EIO errors with
more specialized ones.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
---
 drivers/platform/x86/dell/dell-wmi-ddv.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

--
2.30.2
  

Comments

Hans de Goede Jan. 30, 2023, 3:05 p.m. UTC | #1
Hi,

On 1/26/23 20:40, Armin Wolf wrote:
> In several cases, the DDV WMI interface can return buffers
> with a length of zero. Return -ENODATA in such a case for
> proper error handling. Also replace some -EIO errors with
> more specialized ones.
> 
> Signed-off-by: Armin Wolf <W_Armin@gmx.de>

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


> ---
>  drivers/platform/x86/dell/dell-wmi-ddv.c | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/platform/x86/dell/dell-wmi-ddv.c b/drivers/platform/x86/dell/dell-wmi-ddv.c
> index 9cb6ae42dbdc..f99c4cb686fd 100644
> --- a/drivers/platform/x86/dell/dell-wmi-ddv.c
> +++ b/drivers/platform/x86/dell/dell-wmi-ddv.c
> @@ -11,6 +11,7 @@
>  #include <linux/debugfs.h>
>  #include <linux/device.h>
>  #include <linux/dev_printk.h>
> +#include <linux/errno.h>
>  #include <linux/kernel.h>
>  #include <linux/kstrtox.h>
>  #include <linux/math.h>
> @@ -125,21 +126,27 @@ static int dell_wmi_ddv_query_buffer(struct wmi_device *wdev, enum dell_ddv_meth
>  	if (ret < 0)
>  		return ret;
> 
> -	if (obj->package.count != 2)
> -		goto err_free;
> +	if (obj->package.count != 2 ||
> +	    obj->package.elements[0].type != ACPI_TYPE_INTEGER ||
> +	    obj->package.elements[1].type != ACPI_TYPE_BUFFER) {
> +		ret = -ENOMSG;
> 
> -	if (obj->package.elements[0].type != ACPI_TYPE_INTEGER)
>  		goto err_free;
> +	}
> 
>  	buffer_size = obj->package.elements[0].integer.value;
> 
> -	if (obj->package.elements[1].type != ACPI_TYPE_BUFFER)
> +	if (!buffer_size) {
> +		ret = -ENODATA;
> +
>  		goto err_free;
> +	}
> 
>  	if (buffer_size > obj->package.elements[1].buffer.length) {
>  		dev_warn(&wdev->dev,
>  			 FW_WARN "WMI buffer size (%llu) exceeds ACPI buffer size (%d)\n",
>  			 buffer_size, obj->package.elements[1].buffer.length);
> +		ret = -EMSGSIZE;
> 
>  		goto err_free;
>  	}
> @@ -151,7 +158,7 @@ static int dell_wmi_ddv_query_buffer(struct wmi_device *wdev, enum dell_ddv_meth
>  err_free:
>  	kfree(obj);
> 
> -	return -EIO;
> +	return ret;
>  }
> 
>  static int dell_wmi_ddv_query_string(struct wmi_device *wdev, enum dell_ddv_method method,
> --
> 2.30.2
>
  

Patch

diff --git a/drivers/platform/x86/dell/dell-wmi-ddv.c b/drivers/platform/x86/dell/dell-wmi-ddv.c
index 9cb6ae42dbdc..f99c4cb686fd 100644
--- a/drivers/platform/x86/dell/dell-wmi-ddv.c
+++ b/drivers/platform/x86/dell/dell-wmi-ddv.c
@@ -11,6 +11,7 @@ 
 #include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/dev_printk.h>
+#include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/kstrtox.h>
 #include <linux/math.h>
@@ -125,21 +126,27 @@  static int dell_wmi_ddv_query_buffer(struct wmi_device *wdev, enum dell_ddv_meth
 	if (ret < 0)
 		return ret;

-	if (obj->package.count != 2)
-		goto err_free;
+	if (obj->package.count != 2 ||
+	    obj->package.elements[0].type != ACPI_TYPE_INTEGER ||
+	    obj->package.elements[1].type != ACPI_TYPE_BUFFER) {
+		ret = -ENOMSG;

-	if (obj->package.elements[0].type != ACPI_TYPE_INTEGER)
 		goto err_free;
+	}

 	buffer_size = obj->package.elements[0].integer.value;

-	if (obj->package.elements[1].type != ACPI_TYPE_BUFFER)
+	if (!buffer_size) {
+		ret = -ENODATA;
+
 		goto err_free;
+	}

 	if (buffer_size > obj->package.elements[1].buffer.length) {
 		dev_warn(&wdev->dev,
 			 FW_WARN "WMI buffer size (%llu) exceeds ACPI buffer size (%d)\n",
 			 buffer_size, obj->package.elements[1].buffer.length);
+		ret = -EMSGSIZE;

 		goto err_free;
 	}
@@ -151,7 +158,7 @@  static int dell_wmi_ddv_query_buffer(struct wmi_device *wdev, enum dell_ddv_meth
 err_free:
 	kfree(obj);

-	return -EIO;
+	return ret;
 }

 static int dell_wmi_ddv_query_string(struct wmi_device *wdev, enum dell_ddv_method method,