linux-kernel - [PATCH] vmwgfx: Fix assignment in vmw_framebuffer_create

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Message-ID: <4F231C6C.80803@gmail.com>
Date:	Sat, 28 Jan 2012 08:51:40 +1100
From:	Ryan Mallon <rmallon@...il.com>
To:	airlied@...ux.ie, airlied@...hat.com, thellstrom@...are.com,
	jakob@...are.com
CC:	dri-devel@...ts.freedesktop.org,
	LKML <linux-kernel@...r.kernel.org>, joe@...ches.com,
	stable@...r.kernel.org
Subject: [PATCH] vmwgfx: Fix assignment in vmw_framebuffer_create_handle

The assignment of handle in vmw_framebuffer_create_handle doesn't actually do anything useful and is incorrectly assigning an integer value to a pointer argument. It appears that this is a typo and should be dereferencing handle rather than assigning to it directly. This fixes a bug where an undefined handle value is potentially returned to user-space.

Signed-off-by: Ryan Mallon <rmallon@...il.com>
Reviewed-by: Jakob Bornecrantz<jakob@...are.com>
Cc: stable@...r.kernel.org
---
Thomas and Jakob have said that a correct fix involves returning the correct user_handle, but also requires changes to userspace. This patch is therefore a temporary fix only. Because it corrects an undefined handle value being returned to userspace, this should also be merged for stable kernels.

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index 0af6ebd..b66ef0e 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -378,7 +378,7 @@ int vmw_framebuffer_create_handle(struct drm_framebuffer *fb,
 				  unsigned int *handle)
 {
 	if (handle)
-		handle = 0;
+		*handle = 0;
 
 	return 0;
 }



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