linux-kernel - [PATCH] drm/plane: Remove const qualifier from plane->modifiers allocation type

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Message-Id: <20250426061325.work.665-kees@kernel.org>
Date: Fri, 25 Apr 2025 23:13:26 -0700
From: Kees Cook <kees@...nel.org>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc: Kees Cook <kees@...nel.org>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] drm/plane: Remove const qualifier from plane->modifiers allocation type

In preparation for making the kmalloc family of allocators type aware,
we need to make sure that the returned type from the allocation matches
the type of the variable being assigned. (Before, the allocator would
always return "void *", which can be implicitly cast to any pointer type.)

The assigned type is "uint64_t *", but the returned type, while matching,
will be const qualified. As there is no general way to remove const
qualifiers, adjust the allocation type to match the assignment.

Signed-off-by: Kees Cook <kees@...nel.org>
---
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc: Maxime Ripard <mripard@...nel.org>
Cc: Thomas Zimmermann <tzimmermann@...e.de>
Cc: David Airlie <airlied@...il.com>
Cc: Simona Vetter <simona@...ll.ch>
Cc: <dri-devel@...ts.freedesktop.org>
---
 drivers/gpu/drm/drm_plane.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index a28b22fdd7a4..a9f5c361780d 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -414,7 +414,7 @@ static int __drm_universal_plane_init(struct drm_device *dev,
 
 	plane->modifier_count = format_modifier_count;
 	plane->modifiers = kmalloc_array(format_modifier_count,
-					 sizeof(format_modifiers[0]),
+					 sizeof(*plane->modifiers),
 					 GFP_KERNEL);
 
 	if (format_modifier_count && !plane->modifiers) {
-- 
2.34.1