linux-kernel - [PATCH 1/4] GPU-DRM-QXL: Use kmalloc_array() in qxl_device

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Date:   Thu, 22 Sep 2016 08:20:11 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     dri-devel@...ts.freedesktop.org,
        Bhaktipriya Shridhar <bhaktipriya96@...il.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Noralf Trønnes <noralf@...nnes.org>,
        Tejun Heo <tj@...nel.org>, Thierry Reding <treding@...dia.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH 1/4] GPU-DRM-QXL: Use kmalloc_array() in qxl_device_init()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Wed, 21 Sep 2016 22:26:08 +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.

* Add a bit of exception handling for a detected null pointer.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/gpu/drm/qxl/qxl_kms.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_kms.c b/drivers/gpu/drm/qxl/qxl_kms.c
index e642242..76852f1 100644
--- a/drivers/gpu/drm/qxl/qxl_kms.c
+++ b/drivers/gpu/drm/qxl/qxl_kms.c
@@ -216,10 +216,11 @@ static int qxl_device_init(struct qxl_device *qdev,
 	qdev->slot_id_bits = qdev->rom->slot_id_bits;
 	qdev->va_slot_mask =
 		(~(uint64_t)0) >> (qdev->slot_id_bits + qdev->slot_gen_bits);
-
-	qdev->mem_slots =
-		kmalloc(qdev->n_mem_slots * sizeof(struct qxl_memslot),
-			GFP_KERNEL);
+	qdev->mem_slots = kmalloc_array(qdev->n_mem_slots,
+					sizeof(*qdev->mem_slots),
+					GFP_KERNEL);
+	if (!qdev->mem_slots)
+		return -ENOMEM;
 
 	idr_init(&qdev->release_idr);
 	spin_lock_init(&qdev->release_idr_lock);
-- 
2.10.0