linux-kernel - [PATCH] vmwgfx: Use kcalloc instead of kzalloc to allocate array

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Date:	Tue, 29 Nov 2011 22:08:00 +0100
From:	Thomas Meyer <thomas@...3r.de>
To:	airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] vmwgfx: Use kcalloc instead of kzalloc to allocate array

The advantage of kcalloc is, that will prevent integer overflows which could
result from the multiplication of number of elements and size and it is also
a bit nicer to read.

The semantic patch that makes this change is available
in https://lkml.org/lkml/2011/11/25/107

Signed-off-by: Thomas Meyer <thomas@...3r.de>
---

diff -u -p a/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c 2011-11-13 11:07:24.343455126 +0100
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c 2011-11-28 19:50:07.413502824 +0100
@@ -140,7 +140,7 @@ int vmw_present_ioctl(struct drm_device
 		goto out_clips;
 	}
 
-	clips = kzalloc(num_clips * sizeof(*clips), GFP_KERNEL);
+	clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL);
 	if (clips == NULL) {
 		DRM_ERROR("Failed to allocate clip rect list.\n");
 		ret = -ENOMEM;
@@ -232,7 +232,7 @@ int vmw_present_readback_ioctl(struct dr
 		goto out_clips;
 	}
 
-	clips = kzalloc(num_clips * sizeof(*clips), GFP_KERNEL);
+	clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL);
 	if (clips == NULL) {
 		DRM_ERROR("Failed to allocate clip rect list.\n");
 		ret = -ENOMEM;
--
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