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media: v4l2: allocate v4l2_clip objects early

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The v4l2_format based ioctls can have an indirect pointer to an array
of v4l2_clip structures for overlay mode, depending on the 'type' member.
There are only five drivers that use the overlay mode and copy the
data through the __user pointer.

Change the five drivers to use memcpy() instead, and copy the data
in common code using the check_array_args() helpers. This allows
for a subsequent patch that use the same mechanism for compat
ioctl handlers.

Note that there is another pointer for a 'bitmap' that is only
used in the 'vivid' driver and nowhere else. There is no easy
way to use the same trick without adding complexity to the
common code, so this remains a __user pointer.

[hverkuil: fix: CHECK: spaces preferred around that '*' (ctx:VxV)]
[hverkuil: fix: CHECK: Alignment should match open parenthesis]

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Arnd Bergmann
2020-10-30 17:55:26 +01:00
committed by Mauro Carvalho Chehab
parent 00af58fd9a
commit 3f65c6f67e
7 changed files with 48 additions and 46 deletions
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2
include/uapi/linux/videodev2.h
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@@ -1185,7 +1185,7 @@ struct v4l2_window {
struct v4l2_rect w;
__u32 field; /* enum v4l2_field */
__u32 chromakey;
struct v4l2_clip __user *clips;
struct v4l2_clip *clips;
__u32 clipcount;
void __user *bitmap;
__u8 global_alpha;