linux-kernel - [PATCH v3 7/8] media: uvcvideo: Refactor __uvc_ctrl_add

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Date:   Tue, 03 Jan 2023 15:36:25 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Hans Verkuil <hverkuil@...all.nl>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Ricardo Ribalda <ribalda@...omium.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>
Subject: [PATCH v3 7/8] media: uvcvideo: Refactor __uvc_ctrl_add_mapping

Simplify the exit code with a common error tag freeing all the memory.

Suggested-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Ricardo Ribalda <ribalda@...omium.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:
+	kfree(map->menu_info);
+	kfree(map->name);
+	kfree(map);
+	return -ENOMEM;
 }
 
 int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,

-- 
2.39.0.314.g84b9a713c41-goog-b4-0.11.0-dev-696ae