linux-kernel - [PATCH] drivers/media/usb: fix memory leak in zr364xx

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Message-Id: <20210301203829.345527-1-paskripkin@gmail.com>
Date:   Mon,  1 Mar 2021 23:38:26 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     royale@...ezo.com, mchehab@...nel.org
Cc:     linux-usb@...r.kernel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Pavel Skripkin <paskripkin@...il.com>,
        syzbot+efe9aefc31ae1e6f7675@...kaller.appspotmail.com
Subject: [PATCH] drivers/media/usb: fix memory leak in zr364xx_probe

syzbot reported memory leak in zr364xx_probe()[1].
The problem was in invalid error handling order.
All error conditions rigth after v4l2_ctrl_handler_init()
must call v4l2_ctrl_handler_free().

Reported-by: syzbot+efe9aefc31ae1e6f7675@...kaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
---
 drivers/media/usb/zr364xx/zr364xx.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/media/usb/zr364xx/zr364xx.c b/drivers/media/usb/zr364xx/zr364xx.c
index d29b861367ea..1ef611e08323 100644
--- a/drivers/media/usb/zr364xx/zr364xx.c
+++ b/drivers/media/usb/zr364xx/zr364xx.c
@@ -1430,7 +1430,7 @@ static int zr364xx_probe(struct usb_interface *intf,
 	if (hdl->error) {
 		err = hdl->error;
 		dev_err(&udev->dev, "couldn't register control\n");
-		goto unregister;
+		goto free_hdlr_and_unreg_dev;
 	}
 	/* save the init method used by this camera */
 	cam->method = id->driver_info;
@@ -1503,7 +1503,7 @@ static int zr364xx_probe(struct usb_interface *intf,
 	if (!cam->read_endpoint) {
 		err = -ENOMEM;
 		dev_err(&intf->dev, "Could not find bulk-in endpoint\n");
-		goto unregister;
+		goto free_hdlr_and_unreg_dev;
 	}
 
 	/* v4l */
@@ -1515,7 +1515,7 @@ static int zr364xx_probe(struct usb_interface *intf,
 	/* load zr364xx board specific */
 	err = zr364xx_board_init(cam);
 	if (err)
-		goto unregister;
+		goto free_hdlr_and_unreg_dev;
 	err = v4l2_ctrl_handler_setup(hdl);
 	if (err)
 		goto board_uninit;
@@ -1533,7 +1533,7 @@ static int zr364xx_probe(struct usb_interface *intf,
 	err = video_register_device(&cam->vdev, VFL_TYPE_VIDEO, -1);
 	if (err) {
 		dev_err(&udev->dev, "video_register_device failed\n");
-		goto free_handler;
+		goto board_uninit;
 	}
 	cam->v4l2_dev.release = zr364xx_release;
 
@@ -1541,11 +1541,10 @@ static int zr364xx_probe(struct usb_interface *intf,
 		 video_device_node_name(&cam->vdev));
 	return 0;
 
-free_handler:
-	v4l2_ctrl_handler_free(hdl);
 board_uninit:
 	zr364xx_board_uninit(cam);
-unregister:
+free_hdlr_and_unreg_dev:
+	v4l2_ctrl_handler_free(hdl);
 	v4l2_device_unregister(&cam->v4l2_dev);
 free_cam:
 	kfree(cam);
-- 
2.25.1