Currently, framebuffer_check() doesn't check if the pixel format is
supported, which can lead to the acceptance of invalid pixel formats
e.g. the acceptance of invalid modifiers. Therefore, add a check for
valid formats on framebuffer_check(), so that the ADDFB2 IOCTL rejects
calls with invalid formats.
Moreover, note that this check is only valid for atomic drivers,
because, for non-atomic drivers, checking drm_any_plane_has_format() is
not possible since the format list for the primary plane is fake, and
we'd therefore reject valid formats.
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Maíra Canal <mcanal@xxxxxxxxxx>
---
Documentation/gpu/todo.rst | 9 ++++-----
drivers/gpu/drm/drm_framebuffer.c | 8 ++++++++
2 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst
index 1f8a5ebe188e..3a79c26c5cc7 100644
--- a/Documentation/gpu/todo.rst
+++ b/Documentation/gpu/todo.rst
@@ -276,11 +276,10 @@ Various hold-ups:
- Need to switch to drm_fbdev_generic_setup(), otherwise a lot of the custom fb
setup code can't be deleted.
-- Many drivers wrap drm_gem_fb_create() only to check for valid formats. For
- atomic drivers we could check for valid formats by calling
- drm_plane_check_pixel_format() against all planes, and pass if any plane
- supports the format. For non-atomic that's not possible since like the format
- list for the primary plane is fake and we'd therefor reject valid formats.
+- Need to switch to drm_gem_fb_create(), as now framebuffer_check() checks for
+ valid formats for atomic drivers.
+
+- Add an addfb format validation for non-atomic drivers.
- Many drivers subclass drm_framebuffer, we'd need a embedding compatible
version of the varios drm_gem_fb_create functions. Maybe called
diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
index aff3746dedfb..0afc9e39188a 100644
--- a/drivers/gpu/drm/drm_framebuffer.c
+++ b/drivers/gpu/drm/drm_framebuffer.c
@@ -280,6 +280,14 @@ static int framebuffer_check(struct drm_device *dev,
}
}
+ /* Verify that the modifier is supported. */
+ if (r->modifier[0] && drm_drv_uses_atomic_modeset(dev) &&
+ !drm_any_plane_has_format(dev, r->pixel_format, r->modifier[0])) {
+ drm_dbg_kms(dev, "Unsupported pixel format %p4cc / modifier 0x%llx\n",
+ &r->pixel_format, r->modifier[0]);
+ return -EINVAL;
+ }
+
return 0;
}
--
2.39.0
