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| author | Alexey Khoroshilov <khoroshilov@ispras.ru> | 2013-07-03 16:17:34 -0300 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-10-26 21:06:02 +0100 |
| commit | 9eb9bfa030d8a49d54f0e4ae671e33f406bbbeff (patch) | |
| tree | bb8ba92107101028dd554552174100b39e90c8b9 /drivers/media | |
| parent | 559a2e36f047ac7e1ab27c489322cfd1409dd842 (diff) | |
| download | kernel_samsung_smdk4412-9eb9bfa030d8a49d54f0e4ae671e33f406bbbeff.zip kernel_samsung_smdk4412-9eb9bfa030d8a49d54f0e4ae671e33f406bbbeff.tar.gz kernel_samsung_smdk4412-9eb9bfa030d8a49d54f0e4ae671e33f406bbbeff.tar.bz2 | |
hdpvr: fix iteration over uninitialized lists in hdpvr_probe()
commit 2e923a0527ac439e135b9961e58d3acd876bba10 upstream.
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: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/video/hdpvr/hdpvr-core.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/media/video/hdpvr/hdpvr-core.c b/drivers/media/video/hdpvr/hdpvr-core.c index 6eba006..060353e 100644 --- a/drivers/media/video/hdpvr/hdpvr-core.c +++ b/drivers/media/video/hdpvr/hdpvr-core.c @@ -297,6 +297,11 @@ static int hdpvr_probe(struct usb_interface *interface, 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 */ if (v4l2_device_register(&interface->dev, &dev->v4l2_dev)) { err("v4l2_device_register failed"); @@ -319,10 +324,6 @@ static int hdpvr_probe(struct usb_interface *interface, if (!dev->workqueue) 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; if (default_video_input < HDPVR_VIDEO_INPUTS) @@ -397,7 +398,7 @@ static int hdpvr_probe(struct usb_interface *interface, video_nr[atomic_inc_return(&dev_nr)]); if (retval < 0) { 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 */ |