linux-kernel - [PATCH 1/30] ACPI-processor: Use kmalloc_array() in acpi_processor_get_performance

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Date:   Sat, 10 Sep 2016 11:35:38 +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>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 1/30] ACPI-processor: Use kmalloc_array() in
 acpi_processor_get_performance_states()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Tue, 6 Sep 2016 10:20:10 +0200

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

  This issue was detected by using the Coccinelle software.

* Replace the specification of a data structure by a pointer dereference
  to make the corresponding size determination a bit safer according to
  the Linux coding style convention.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/acpi/processor_perflib.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index bb01dea..78f9025 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -346,9 +346,9 @@ static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 			  pss->package.count));
 
 	pr->performance->state_count = pss->package.count;
-	pr->performance->states =
-	    kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
-		    GFP_KERNEL);
+	pr->performance->states = kmalloc_array(pss->package.count,
+						sizeof(*pr->performance->states),
+						GFP_KERNEL);
 	if (!pr->performance->states) {
 		result = -ENOMEM;
 		goto end;
-- 
2.10.0