linux-kernel - [PATCH v2 1/9] ACPI-video: Use kmalloc_array() in acpi_video_get

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Date:   Wed, 9 Aug 2017 17:33:41 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-acpi@...r.kernel.org, Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Zhang Rui <rui.zhang@...el.com>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH v2 1/9] ACPI-video: Use kmalloc_array() in
 acpi_video_get_levels()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Wed, 9 Aug 2017 14:52:25 +0200

A multiplication for the size determination of a memory allocation
indicated that an array data structure should be processed.
Thus use the corresponding function "kmalloc_array".

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/acpi/acpi_video.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c
index 0972ec0e2eb8..1aaf2b591ca8 100644
--- a/drivers/acpi/acpi_video.c
+++ b/drivers/acpi/acpi_video.c
@@ -832,8 +832,9 @@ int acpi_video_get_levels(struct acpi_device *device,
 	 * in order to account for buggy BIOS which don't export the first two
 	 * special levels (see below)
 	 */
-	br->levels = kmalloc((obj->package.count + ACPI_VIDEO_FIRST_LEVEL) *
-	                     sizeof(*br->levels), GFP_KERNEL);
+	br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL,
+				   sizeof(*br->levels),
+				   GFP_KERNEL);
 	if (!br->levels) {
 		result = -ENOMEM;
 		goto out_free;
-- 
2.13.4