diff mbox series

[v3,7/8] media: uvcvideo: Refactor __uvc_ctrl_add_mapping

Message ID 20220920-resend-v4l2-compliance-v3-7-598d33a15815@chromium.org
State New
Headers
Series Follow-up patches for uvc v4l2-compliance |

Commit Message

Ricardo Ribalda Jan. 3, 2023, 2:36 p.m. UTC 
  Simplify the exit code with a common error tag freeing all the memory.

Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

Comments

Laurent Pinchart Jan. 3, 2023, 8:22 p.m. UTC | #1 
Hi Ricardo,

Thank you for the patch.

On Tue, Jan 03, 2023 at 03:36:25PM +0100, Ricardo Ribalda wrote:
> Simplify the exit code with a common error tag freeing all the memory.
> 
> Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> ---
>  drivers/media/usb/uvc/uvc_ctrl.c | 26 +++++++++++++++-----------
>  1 file changed, 15 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> index aa7a668f60a7..4830120e6506 100644
> --- a/drivers/media/usb/uvc/uvc_ctrl.c
> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> @@ -2296,32 +2296,30 @@ static int __uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
>  	unsigned int i;
>  
>  	/*
> -	 * Most mappings come from static kernel data and need to be duplicated.
> +	 * Most mappings come from static kernel data, and need to be duplicated.
>  	 * Mappings that come from userspace will be unnecessarily duplicated,
>  	 * this could be optimized.
>  	 */
>  	map = kmemdup(mapping, sizeof(*mapping), GFP_KERNEL);
> -	if (map == NULL)
> +	if (!map)
>  		return -ENOMEM;
>  
> +	map->name = NULL;
> +	map->menu_info = NULL;
> +
>  	/* For UVCIOC_CTRL_MAP custom control */
>  	if (mapping->name) {
>  		map->name = kstrdup(mapping->name, GFP_KERNEL);
> -		if (!map->name) {
> -			kfree(map);
> -			return -ENOMEM;
> -		}
> +		if (!map->name)
> +			goto nomem;
>  	}
>  
>  	INIT_LIST_HEAD(&map->ev_subs);
>  
>  	size = sizeof(*mapping->menu_info) * fls(mapping->menu_mask);
>  	map->menu_info = kmemdup(mapping->menu_info, size, GFP_KERNEL);
> -	if (map->menu_info == NULL) {
> -		kfree(map->name);
> -		kfree(map);
> -		return -ENOMEM;
> -	}
> +	if (!map->menu_info)
> +		goto nomem;
>  
>  	if (map->get == NULL)
>  		map->get = uvc_get_le_value;
> @@ -2342,6 +2340,12 @@ static int __uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
>  		ctrl->info.selector);
>  
>  	return 0;
> +
> +nomem:

As it's an error label, I'd name it err_nomem. I'll fix that when
applying.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> +	kfree(map->menu_info);
> +	kfree(map->name);
> +	kfree(map);
> +	return -ENOMEM;
>  }
>  
>  int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
>
diff mbox series

Patch

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index aa7a668f60a7..4830120e6506 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -2296,32 +2296,30 @@  static int __uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
 	unsigned int i;
 
 	/*
-	 * Most mappings come from static kernel data and need to be duplicated.
+	 * Most mappings come from static kernel data, and need to be duplicated.
 	 * Mappings that come from userspace will be unnecessarily duplicated,
 	 * this could be optimized.
 	 */
 	map = kmemdup(mapping, sizeof(*mapping), GFP_KERNEL);
-	if (map == NULL)
+	if (!map)
 		return -ENOMEM;
 
+	map->name = NULL;
+	map->menu_info = NULL;
+
 	/* For UVCIOC_CTRL_MAP custom control */
 	if (mapping->name) {
 		map->name = kstrdup(mapping->name, GFP_KERNEL);
-		if (!map->name) {
-			kfree(map);
-			return -ENOMEM;
-		}
+		if (!map->name)
+			goto nomem;
 	}
 
 	INIT_LIST_HEAD(&map->ev_subs);
 
 	size = sizeof(*mapping->menu_info) * fls(mapping->menu_mask);
 	map->menu_info = kmemdup(mapping->menu_info, size, GFP_KERNEL);
-	if (map->menu_info == NULL) {
-		kfree(map->name);
-		kfree(map);
-		return -ENOMEM;
-	}
+	if (!map->menu_info)
+		goto nomem;
 
 	if (map->get == NULL)
 		map->get = uvc_get_le_value;
@@ -2342,6 +2340,12 @@  static int __uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
 		ctrl->info.selector);
 
 	return 0;
+
+nomem:
+	kfree(map->menu_info);
+	kfree(map->name);
+	kfree(map);
+	return -ENOMEM;
 }
 
 int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,