On 12/3/21 13:08, Liviu Dudau wrote:
On Fri, Dec 03, 2021 at 10:28:15AM +0000, Steven Price wrote:
While the check for format_count > 64 in __drm_universal_plane_init()
shouldn't be hit (it's a WARN_ON), in its current position it will then
leak the plane->format_types array and fail to call
drm_mode_object_unregister() leaking the modeset identifier. Move it to
the start of the function to avoid allocating those resources in the
first place.
Signed-off-by: Steven Price <steven.price@xxxxxxx>
Well spotted!
Reviewed-by: Liviu Dudau <liviu.dudau@xxxxxxx>
I'm going to wait to see if anyone else has any comments before I'll merge this into
drm-misc-fixes (or should it be drm-misc-next-fixes?)
This definitely looks to fix an ugly I spotted too while looking at your
prior patch thinking it might be wrong so a +1 from me.
Best regards,
Liviu
---
drivers/gpu/drm/drm_plane.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 82afb854141b..fd0bf90fb4c2 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -249,6 +249,13 @@ static int __drm_universal_plane_init(struct drm_device *dev,
if (WARN_ON(config->num_total_plane >= 32))
return -EINVAL;
+ /*
+ * First driver to need more than 64 formats needs to fix this. Each
+ * format is encoded as a bit and the current code only supports a u64.
+ */
+ if (WARN_ON(format_count > 64))
+ return -EINVAL;
+
WARN_ON(drm_drv_uses_atomic_modeset(dev) &&
(!funcs->atomic_destroy_state ||
!funcs->atomic_duplicate_state));
@@ -270,13 +277,6 @@ static int __drm_universal_plane_init(struct drm_device *dev,
return -ENOMEM;
}
- /*
- * First driver to need more than 64 formats needs to fix this. Each
- * format is encoded as a bit and the current code only supports a u64.
- */
- if (WARN_ON(format_count > 64))
- return -EINVAL;
-
if (format_modifiers) {
const uint64_t *temp_modifiers = format_modifiers;
--
2.25.1
