diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2021-06-14 12:34:09 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-06-17 10:18:37 +0200 |
| commit | 0a7790be182d32b9b332a37cb4206e24fe94b728 (patch) | |
| tree | 0af9820ab8c7f6c58afe4e4de4da2335496176ad /drivers/media/pci/saa7134 | |
| parent | b4c650f1af68251f1970aecfc3c2fceec1552da2 (diff) | |
media: subdev: disallow ioctl for saa6588/davinci
The saa6588_ioctl() function expects to get called from other kernel
functions with a 'saa6588_command' pointer, but I found nothing stops it
from getting called from user space instead, which seems rather dangerous.
The same thing happens in the davinci vpbe driver with its VENC_GET_FLD
command.
As a quick fix, add a separate .command() callback pointer for this
driver and change the two callers over to that. This change can easily
get backported to stable kernels if necessary, but since there are only
two drivers, we may want to eventually replace this with a set of more
specialized callbacks in the long run.
Fixes: c3fda7f835b0 ("V4L/DVB (10537): saa6588: convert to v4l2_subdev.")
Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media/pci/saa7134')
| -rw-r--r-- | drivers/media/pci/saa7134/saa7134-video.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/media/pci/saa7134/saa7134-video.c b/drivers/media/pci/saa7134/saa7134-video.c index 0f9d6b9edb90..374c8e1087de 100644 --- a/drivers/media/pci/saa7134/saa7134-video.c +++ b/drivers/media/pci/saa7134/saa7134-video.c @@ -1181,7 +1181,7 @@ static int video_release(struct file *file) saa_call_all(dev, tuner, standby); if (vdev->vfl_type == VFL_TYPE_RADIO) - saa_call_all(dev, core, ioctl, SAA6588_CMD_CLOSE, &cmd); + saa_call_all(dev, core, command, SAA6588_CMD_CLOSE, &cmd); mutex_unlock(&dev->lock); return 0; @@ -1200,7 +1200,7 @@ static ssize_t radio_read(struct file *file, char __user *data, cmd.result = -ENODEV; mutex_lock(&dev->lock); - saa_call_all(dev, core, ioctl, SAA6588_CMD_READ, &cmd); + saa_call_all(dev, core, command, SAA6588_CMD_READ, &cmd); mutex_unlock(&dev->lock); return cmd.result; @@ -1216,7 +1216,7 @@ static __poll_t radio_poll(struct file *file, poll_table *wait) cmd.event_list = wait; cmd.poll_mask = 0; mutex_lock(&dev->lock); - saa_call_all(dev, core, ioctl, SAA6588_CMD_POLL, &cmd); + saa_call_all(dev, core, command, SAA6588_CMD_POLL, &cmd); mutex_unlock(&dev->lock); return rc | cmd.poll_mask; |