[PATCH 4.14 021/195] media: hdpvr: Fix an error handling path in hdpvr_probe()

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arvind Yadav <arvind.yadav...@gmail.com>

commit c0f71bbb810237a38734607ca4599632f7f5d47f upstream.

Here, hdpvr_register_videodev() is responsible for setup and
register a video device. Also defining and initializing a worker.
hdpvr_register_videodev() is calling by hdpvr_probe at last.
So no need to flush any work here.
Unregister v4l2, free buffers and memory. If hdpvr_probe() will fail.

Signed-off-by: Arvind Yadav <arvind.yadav...@gmail.com>
Reported-by: Andrey Konovalov <andreyk...@google.com>
Tested-by: Andrey Konovalov <andreyk...@google.com>
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
Cc: Ben Hutchings <ben.hutchi...@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/media/usb/hdpvr/hdpvr-core.c |   26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

--- a/drivers/media/usb/hdpvr/hdpvr-core.c
+++ b/drivers/media/usb/hdpvr/hdpvr-core.c
@@ -292,7 +292,7 @@ static int hdpvr_probe(struct usb_interf
        /* register v4l2_device early so it can be used for printks */
        if (v4l2_device_register(&interface->dev, &dev->v4l2_dev)) {
                dev_err(&interface->dev, "v4l2_device_register failed\n");
-               goto error;
+               goto error_free_dev;
        }
 
        mutex_init(&dev->io_mutex);
@@ -301,7 +301,7 @@ static int hdpvr_probe(struct usb_interf
        dev->usbc_buf = kmalloc(64, GFP_KERNEL);
        if (!dev->usbc_buf) {
                v4l2_err(&dev->v4l2_dev, "Out of memory\n");
-               goto error;
+               goto error_v4l2_unregister;
        }
 
        init_waitqueue_head(&dev->wait_buffer);
@@ -339,13 +339,13 @@ static int hdpvr_probe(struct usb_interf
        }
        if (!dev->bulk_in_endpointAddr) {
                v4l2_err(&dev->v4l2_dev, "Could not find bulk-in endpoint\n");
-               goto error;
+               goto error_put_usb;
        }
 
        /* init the device */
        if (hdpvr_device_init(dev)) {
                v4l2_err(&dev->v4l2_dev, "device init failed\n");
-               goto error;
+               goto error_put_usb;
        }
 
        mutex_lock(&dev->io_mutex);
@@ -353,7 +353,7 @@ static int hdpvr_probe(struct usb_interf
                mutex_unlock(&dev->io_mutex);
                v4l2_err(&dev->v4l2_dev,
                         "allocating transfer buffers failed\n");
-               goto error;
+               goto error_put_usb;
        }
        mutex_unlock(&dev->io_mutex);
 
@@ -361,7 +361,7 @@ static int hdpvr_probe(struct usb_interf
        retval = hdpvr_register_i2c_adapter(dev);
        if (retval < 0) {
                v4l2_err(&dev->v4l2_dev, "i2c adapter register failed\n");
-               goto error;
+               goto error_free_buffers;
        }
 
        client = hdpvr_register_ir_rx_i2c(dev);
@@ -394,13 +394,17 @@ static int hdpvr_probe(struct usb_interf
 reg_fail:
 #if IS_ENABLED(CONFIG_I2C)
        i2c_del_adapter(&dev->i2c_adapter);
+error_free_buffers:
 #endif
+       hdpvr_free_buffers(dev);
+error_put_usb:
+       usb_put_dev(dev->udev);
+       kfree(dev->usbc_buf);
+error_v4l2_unregister:
+       v4l2_device_unregister(&dev->v4l2_dev);
+error_free_dev:
+       kfree(dev);
 error:
-       if (dev) {
-               flush_work(&dev->worker);
-               /* this frees allocated memory */
-               hdpvr_delete(dev);
-       }
        return retval;
 }