linux-kernel - [PATCH 16/30] ACPI-processor: Use kmalloc_array() in acpi_processor_get_throttling

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Date:   Sat, 10 Sep 2016 11:58:04 +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 16/30] ACPI-processor: Use kmalloc_array() in
 acpi_processor_get_throttling_states()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Tue, 6 Sep 2016 19:15:02 +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_throttling.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index c72e648..0a46b7f 100644
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -533,9 +533,10 @@ static int acpi_processor_get_throttling_states(struct acpi_processor *pr)
 			  tss->package.count));
 
 	pr->throttling.state_count = tss->package.count;
-	pr->throttling.states_tss =
-	    kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count,
-		    GFP_KERNEL);
+	pr->throttling.states_tss = kmalloc_array(tss->package.count,
+						  sizeof(*pr->
+							 throttling.states_tss),
+						  GFP_KERNEL);
 	if (!pr->throttling.states_tss) {
 		result = -ENOMEM;
 		goto end;
-- 
2.10.0