linux-kernel - [PATCH 1/4] Input-gameport: Use kmalloc_array() in joydump

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Date:   Sat, 24 Sep 2016 15:46:21 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-input@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH 1/4] Input-gameport: Use kmalloc_array() in joydump_connect()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sat, 24 Sep 2016 13:50:20 +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.

* 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/input/joystick/joydump.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/input/joystick/joydump.c b/drivers/input/joystick/joydump.c
index d1c6e48..e515058 100644
--- a/drivers/input/joystick/joydump.c
+++ b/drivers/input/joystick/joydump.c
@@ -79,8 +79,7 @@ static int joydump_connect(struct gameport *gameport, struct gameport_driver *dr
 	}
 
 	timeout = gameport_time(gameport, 10000); /* 10 ms */
-
-	buf = kmalloc(BUF_SIZE * sizeof(struct joydump), GFP_KERNEL);
+	buf = kmalloc_array(BUF_SIZE, sizeof(*buf), GFP_KERNEL);
 	if (!buf) {
 		printk(KERN_INFO "joydump: no memory for testing\n");
 		goto jd_end;
-- 
2.10.0