diff options
| author | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2019-07-23 11:21:25 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-07-25 13:28:51 +0300 |
| commit | 3c1350501c21db8e3b1a38d9e97db29694305c3b (patch) | |
| tree | 883ab470dc8d470ef7e4c71432b33baca748a46f /drivers/media/v4l2-core | |
| parent | 08aac0e32fe44b0afe67da96b01c5c0aa27c7b67 (diff) | |
| download | linux-3c1350501c21db8e3b1a38d9e97db29694305c3b.tar.xz | |
media: v4l2-dev/ioctl: require non-zero device_caps, verify sane querycap results
Now that all V4L2 drivers set device_caps in struct video_device, we can add
a check for this to ensure all future drivers fill this in.
Also verify that when the querycap ioctl is called the driver didn't mess
with the device_caps value and that capabilities is a superset of device_caps.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
[hverkuil-cisco@xs4all.nl: fix too-long line]
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'drivers/media/v4l2-core')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-dev.c | 3 | ||||
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-ioctl.c | 17 |
2 files changed, 14 insertions, 6 deletions
diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c index cbb74f748555..3af72e3bbd65 100644 --- a/drivers/media/v4l2-core/v4l2-dev.c +++ b/drivers/media/v4l2-core/v4l2-dev.c @@ -859,6 +859,9 @@ int __video_register_device(struct video_device *vdev, /* the v4l2_dev pointer MUST be present */ if (WARN_ON(!vdev->v4l2_dev)) return -EINVAL; + /* the device_caps field MUST be set */ + if (WARN_ON(!vdev->device_caps)) + return -EINVAL; /* v4l2_fh support */ spin_lock_init(&vdev->fh_lock); diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c index 38765af9ad2d..9484cc2619e4 100644 --- a/drivers/media/v4l2-core/v4l2-ioctl.c +++ b/drivers/media/v4l2-core/v4l2-ioctl.c @@ -1057,14 +1057,19 @@ static int v4l_querycap(const struct v4l2_ioctl_ops *ops, ret = ops->vidioc_querycap(file, fh, cap); - cap->capabilities |= V4L2_CAP_EXT_PIX_FORMAT; /* - * Drivers MUST fill in device_caps, so check for this and - * warn if it was forgotten. + * Drivers must not change device_caps, so check for this and + * warn if this happened. + */ + WARN_ON(cap->device_caps != vfd->device_caps); + /* + * Check that capabilities is a superset of + * vfd->device_caps | V4L2_CAP_DEVICE_CAPS */ - WARN(!(cap->capabilities & V4L2_CAP_DEVICE_CAPS) || - !cap->device_caps, "Bad caps for driver %s, %x %x", - cap->driver, cap->capabilities, cap->device_caps); + WARN_ON((cap->capabilities & + (vfd->device_caps | V4L2_CAP_DEVICE_CAPS)) != + (vfd->device_caps | V4L2_CAP_DEVICE_CAPS)); + cap->capabilities |= V4L2_CAP_EXT_PIX_FORMAT; cap->device_caps |= V4L2_CAP_EXT_PIX_FORMAT; return ret; |