linux-kernel - [PATCH 3/3] drm: property: Improve four size determinations

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Date: Tue, 26 Dec 2023 10:42:43 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: dri-devel@...ts.freedesktop.org, kernel-janitors@...r.kernel.org,
 Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>
Cc: LKML <linux-kernel@...r.kernel.org>, cocci@...ia.fr
Subject: [PATCH 3/3] drm: property: Improve four size determinations

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Tue, 26 Dec 2023 09:45:36 +0100

Replace the specification of data structures by pointer dereferences
as the parameter for the operator “sizeof” to make the corresponding size
determination a bit safer according to the Linux coding style convention.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/gpu/drm/drm_property.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_property.c b/drivers/gpu/drm/drm_property.c
index ea365f00e890..1fe54cbf1c83 100644
--- a/drivers/gpu/drm/drm_property.c
+++ b/drivers/gpu/drm/drm_property.c
@@ -107,7 +107,7 @@ struct drm_property *drm_property_create(struct drm_device *dev,
 	if (WARN_ON(strlen(name) >= DRM_PROP_NAME_LEN))
 		return NULL;

-	property = kzalloc(sizeof(struct drm_property), GFP_KERNEL);
+	property = kzalloc(sizeof(*property), GFP_KERNEL);
 	if (!property)
 		return NULL;

@@ -418,7 +418,7 @@ int drm_property_add_enum(struct drm_property *property,
 	if (WARN_ON(index >= property->num_values))
 		return -EINVAL;

-	prop_enum = kzalloc(sizeof(struct drm_property_enum), GFP_KERNEL);
+	prop_enum = kzalloc(sizeof(*prop_enum), GFP_KERNEL);
 	if (!prop_enum)
 		return -ENOMEM;

@@ -560,10 +560,10 @@ drm_property_create_blob(struct drm_device *dev, size_t length,
 	struct drm_property_blob *blob;
 	int ret;

-	if (!length || length > INT_MAX - sizeof(struct drm_property_blob))
+	if (!length || length > INT_MAX - sizeof(*blob))
 		return ERR_PTR(-EINVAL);

-	blob = kvzalloc(sizeof(struct drm_property_blob)+length, GFP_KERNEL);
+	blob = kvzalloc(sizeof(*blob) + length, GFP_KERNEL);
 	if (!blob)
 		return ERR_PTR(-ENOMEM);

--
2.43.0