linux-kernel - [PATCH] drm/ssd130x: Use kmalloc

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Message-ID: <20250914073841.69582-1-bold.zone2373@fastmail.com>
Date: Sun, 14 Sep 2025 00:38:22 -0700
From: James Flowers <bold.zone2373@...tmail.com>
To: javierm@...hat.com,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	skhan@...uxfoundation.com
Cc: James Flowers <bold.zone2373@...tmail.com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	linux-kernel-mentees@...ts.linux.dev
Subject: [PATCH] drm/ssd130x: Use kmalloc_array() instead of kmalloc()

Documentation/process/deprecated.rst recommends against the use of
kmalloc with dynamic size calculations due to the risk of overflow and
smaller allocation being made than the caller was expecting.
kmalloc_array avoids this issue.

Signed-off-by: James Flowers <bold.zone2373@...tmail.com>
---
Note: this has only been compile tested.

 drivers/gpu/drm/solomon/ssd130x.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c
index eec43d1a5595..8368f0ffbe1e 100644
--- a/drivers/gpu/drm/solomon/ssd130x.c
+++ b/drivers/gpu/drm/solomon/ssd130x.c
@@ -1498,7 +1498,7 @@ static int ssd130x_crtc_atomic_check(struct drm_crtc *crtc,
 	if (ret)
 		return ret;
 
-	ssd130x_state->data_array = kmalloc(ssd130x->width * pages, GFP_KERNEL);
+	ssd130x_state->data_array = kmalloc_array(ssd130x->width, pages, GFP_KERNEL);
 	if (!ssd130x_state->data_array)
 		return -ENOMEM;
 
@@ -1519,7 +1519,7 @@ static int ssd132x_crtc_atomic_check(struct drm_crtc *crtc,
 	if (ret)
 		return ret;
 
-	ssd130x_state->data_array = kmalloc(columns * ssd130x->height, GFP_KERNEL);
+	ssd130x_state->data_array = kmalloc_array(columns, ssd130x->height, GFP_KERNEL);
 	if (!ssd130x_state->data_array)
 		return -ENOMEM;
 
@@ -1546,7 +1546,7 @@ static int ssd133x_crtc_atomic_check(struct drm_crtc *crtc,
 
 	pitch = drm_format_info_min_pitch(fi, 0, ssd130x->width);
 
-	ssd130x_state->data_array = kmalloc(pitch * ssd130x->height, GFP_KERNEL);
+	ssd130x_state->data_array = kmalloc_array(pitch, ssd130x->height, GFP_KERNEL);
 	if (!ssd130x_state->data_array)
 		return -ENOMEM;
 
-- 
2.51.0