Fix property handling for mode object without mode object type. drm_property_change_valid_get() crashes if atomic ioctl for mode object does not specify the mode object type. This patch makes drm_property_change_valid_get() to tolerate such requests.

Signed-off-by: Jyri Sarha jsarha@ti.com ---

This used to work in v4.8, but I have no idea if this is a right fix or should we just gracefully reject ioctls to mode object properties without mode object type. In such a case we need to fix our test tool [1].

[1] https://github.com/tomba/kmsxx

drivers/gpu/drm/drm_property.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_property.c b/drivers/gpu/drm/drm_property.c index 4139afb..67261a2 100644 --- a/drivers/gpu/drm/drm_property.c +++ b/drivers/gpu/drm/drm_property.c @@ -877,7 +877,9 @@ bool drm_property_change_valid_get(struct drm_property *property, return true;

*ref = __drm_mode_object_find(property->dev, value, - property->values[0]); + property->num_values ? + property->values[0] : + DRM_MODE_OBJECT_ANY); return *ref != NULL; }