linux-kernel - [PATCH 4/5] fsl_hypervisor: Use kcalloc() in ioctl

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Date:   Sat, 20 May 2017 21:14:45 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     Arnd Bergmann <arnd@...db.de>, Jan Kara <jack@...e.cz>,
        Jesper Nilsson <jesper.nilsson@...s.com>,
        Kumar Gala <galak@...nel.crashing.org>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Michal Hocko <mhocko@...e.com>,
        Timur Tabi <timur@...escale.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 4/5] fsl_hypervisor: Use kcalloc() in ioctl_memcpy()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sat, 20 May 2017 20:15:57 +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 "kcalloc".

  This issue was detected by using the Coccinelle software.

* Replace the specification of a data type 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/virt/fsl_hypervisor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/virt/fsl_hypervisor.c b/drivers/virt/fsl_hypervisor.c
index 9e881dc29c6b..4031632b8c9d 100644
--- a/drivers/virt/fsl_hypervisor.c
+++ b/drivers/virt/fsl_hypervisor.c
@@ -223,5 +223,5 @@ static long ioctl_memcpy(struct fsl_hv_ioctl_memcpy __user *p)
 	 * 'pages' is an array of struct page pointers that's initialized by
 	 * get_user_pages().
 	 */
-	pages = kzalloc(num_pages * sizeof(struct page *), GFP_KERNEL);
+	pages = kcalloc(num_pages, sizeof(*pages), GFP_KERNEL);
 	if (!pages) {
-- 
2.13.0