linux-kernel - [PATCH] drm: amd: Use kmalloc_array to prevent overflow of dynamic size calculation

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Message-Id: <20251002022241.77823-1-bhanuseshukumar@gmail.com>
Date: Thu,  2 Oct 2025 07:52:41 +0530
From: Bhanu Seshu Kumar Valluri <bhanuseshukumar@...il.com>
To: Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Harry Wentland <harry.wentland@....com>,
	Leo Li <sunpeng.li@....com>,
	Rodrigo Siqueira <siqueira@...lia.com>,
	Tao Zhou <tao.zhou1@....com>,
	Hawking Zhang <Hawking.Zhang@....com>,
	ganglxie <ganglxie@....com>,
	Lijo Lazar <lijo.lazar@....com>,
	Candice Li <candice.li@....com>,
	Victor Skvortsov <victor.skvortsov@....com>,
	Roman Li <roman.li@....com>,
	Alvin Lee <Alvin.Lee2@....com>,
	Karthi Kandasamy <karthi.kandasamy@....com>,
	David Rosca <david.rosca@....com>,
	Marek Olšák <marek.olsak@....com>,
	Jocelyn Falempe <jfalempe@...hat.com>,
	André Almeida <andrealmeid@...lia.com>,
	Mario Limonciello <mario.limonciello@....com>
Cc: amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	khalid@...nel.org,
	linux-kernel-mentees@...ts.linuxfoundation.org,
	skhan@...uxfoundation.org,
	david.hunter.linux@...il.com,
	bhanuseshukumar@...il.com
Subject: [PATCH] drm: amd:  Use kmalloc_array to prevent overflow of dynamic size calculation

Use kmalloc_array to avoid potential overflow during dynamic size calculation
inside kmalloc.

Signed-off-by: Bhanu Seshu Kumar Valluri <bhanuseshukumar@...il.com>
---
 Note:
 Patch is verified for compilation.
 
 drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c                 | 4 ++--
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index 540817e296da..642addf70466 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -2566,7 +2566,7 @@ static int amdgpu_ras_badpages_read(struct amdgpu_device *adev,
 		goto out;
 	}
 
-	*bps = kmalloc(sizeof(struct ras_badpage) * data->count, GFP_KERNEL);
+	*bps = kmalloc_array(sizeof(struct ras_badpage), data->count, GFP_KERNEL);
 	if (!*bps) {
 		ret = -ENOMEM;
 		goto out;
@@ -2722,7 +2722,7 @@ static int amdgpu_ras_realloc_eh_data_space(struct amdgpu_device *adev,
 	unsigned int old_space = data->count + data->space_left;
 	unsigned int new_space = old_space + pages;
 	unsigned int align_space = ALIGN(new_space, 512);
-	void *bps = kmalloc(align_space * sizeof(*data->bps), GFP_KERNEL);
+	void *bps = kmalloc_array(align_space, sizeof(*data->bps), GFP_KERNEL);
 
 	if (!bps) {
 		return -ENOMEM;
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
index 3d2f8eedeef2..e027798ece03 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
@@ -146,7 +146,7 @@ static void amdgpu_dm_plane_add_modifier(uint64_t **mods, uint64_t *size, uint64
 
 	if (*cap - *size < 1) {
 		uint64_t new_cap = *cap * 2;
-		uint64_t *new_mods = kmalloc(new_cap * sizeof(uint64_t), GFP_KERNEL);
+		uint64_t *new_mods = kmalloc_array(new_cap, sizeof(uint64_t), GFP_KERNEL);
 
 		if (!new_mods) {
 			kfree(*mods);
@@ -732,7 +732,7 @@ static int amdgpu_dm_plane_get_plane_modifiers(struct amdgpu_device *adev, unsig
 	if (adev->family < AMDGPU_FAMILY_AI)
 		return 0;
 
-	*mods = kmalloc(capacity * sizeof(uint64_t), GFP_KERNEL);
+	*mods = kmalloc_array(capacity, sizeof(uint64_t), GFP_KERNEL);
 
 	if (plane_type == DRM_PLANE_TYPE_CURSOR) {
 		amdgpu_dm_plane_add_modifier(mods, &size, &capacity, DRM_FORMAT_MOD_LINEAR);
-- 
2.34.1