Commit e2f11c58 authored by Alexey Khoroshilov's avatar Alexey Khoroshilov Committed by Mauro Carvalho Chehab

[media] hdpvr: fix iteration over uninitialized lists in hdpvr_probe()

free_buff_list and rec_buff_list are initialized in the middle of hdpvr_probe(),
but if something bad happens before that, error handling code calls hdpvr_delete(),
which contains iteration over the lists (via hdpvr_free_buffers()).
The patch moves the lists initialization to the beginning and by the way fixes
goto label in error handling of registering videodev.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: default avatarAlexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
parent 4f24abb5
...@@ -303,6 +303,11 @@ static int hdpvr_probe(struct usb_interface *interface, ...@@ -303,6 +303,11 @@ static int hdpvr_probe(struct usb_interface *interface,
dev->workqueue = 0; dev->workqueue = 0;
/* init video transfer queues first of all */
/* to prevent oops in hdpvr_delete() on error paths */
INIT_LIST_HEAD(&dev->free_buff_list);
INIT_LIST_HEAD(&dev->rec_buff_list);
/* register v4l2_device early so it can be used for printks */ /* register v4l2_device early so it can be used for printks */
if (v4l2_device_register(&interface->dev, &dev->v4l2_dev)) { if (v4l2_device_register(&interface->dev, &dev->v4l2_dev)) {
dev_err(&interface->dev, "v4l2_device_register failed\n"); dev_err(&interface->dev, "v4l2_device_register failed\n");
...@@ -325,10 +330,6 @@ static int hdpvr_probe(struct usb_interface *interface, ...@@ -325,10 +330,6 @@ static int hdpvr_probe(struct usb_interface *interface,
if (!dev->workqueue) if (!dev->workqueue)
goto error; goto error;
/* init video transfer queues */
INIT_LIST_HEAD(&dev->free_buff_list);
INIT_LIST_HEAD(&dev->rec_buff_list);
dev->options = hdpvr_default_options; dev->options = hdpvr_default_options;
if (default_video_input < HDPVR_VIDEO_INPUTS) if (default_video_input < HDPVR_VIDEO_INPUTS)
...@@ -405,7 +406,7 @@ static int hdpvr_probe(struct usb_interface *interface, ...@@ -405,7 +406,7 @@ static int hdpvr_probe(struct usb_interface *interface,
video_nr[atomic_inc_return(&dev_nr)]); video_nr[atomic_inc_return(&dev_nr)]);
if (retval < 0) { if (retval < 0) {
v4l2_err(&dev->v4l2_dev, "registering videodev failed\n"); v4l2_err(&dev->v4l2_dev, "registering videodev failed\n");
goto error; goto reg_fail;
} }
/* let the user know what node this device is now attached to */ /* let the user know what node this device is now attached to */
......
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