[PATCH 5.5 063/367] media: v4l2-rect.h: fix v4l2_rect_map_inside() top/left adjustments

Greg Kroah-Hartman
2020-02-10T12:43:03Z

From: Helen Koike <helen.koike@collabora.com>

commit f51e50db4c20d46930b33be3f208851265694f3e upstream.

boundary->width and boundary->height are sizes relative to
boundary->left and boundary->top coordinates, but they were not being
taken into consideration to adjust r->left and r->top, leading to the
following error:

Consider the follow as initial values for boundary and r:

struct v4l2_rect boundary = {
.left = 100,
.top = 100,
.width = 800,
.height = 600,
}

struct v4l2_rect r = {
.left = 0,
.top = 0,
.width = 1920,
.height = 960,
}

calling v4l2_rect_map_inside(&r, &boundary) was modifying r to:

r = {
.left = 0,
.top = 0,
.width = 800,
.height = 600,
}

Which is wrongly outside the boundary rectangle, because:

v4l2_rect_set_max_size(r, boundary); // r->width = 800, r->height = 600
...
if (r->left + r->width > boundary->width) // true
r->left = boundary->width - r->width; // r->left = 800 - 800
if (r->top + r->height > boundary->height) // true
r->top = boundary->height - r->height; // r->height = 600 - 600

Fix this by considering top/left coordinates from boundary.

Fixes: ac49de8c49d7 ("[media] v4l2-rect.h: new header with struct v4l2_rect helper functions")
Signed-off-by: Helen Koike <helen.koike@collabora.com>
Cc: <stable@vger.kernel.org> # for v4.7 and up
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
include/media/v4l2-rect.h | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- a/include/media/v4l2-rect.h
+++ b/include/media/v4l2-rect.h
@@ -63,10 +63,10 @@ static inline void v4l2_rect_map_inside(
r->left = boundary->left;
if (r->top < boundary->top)
r->top = boundary->top;
- if (r->left + r->width > boundary->width)
- r->left = boundary->width - r->width;
- if (r->top + r->height > boundary->height)
- r->top = boundary->height - r->height;
+ if (r->left + r->width > boundary->left + boundary->width)
+ r->left = boundary->left + boundary->width - r->width;
+ if (r->top + r->height > boundary->top + boundary->height)
+ r->top = boundary->top + boundary->height - r->height;
}

/**