linux-kernel - [032/114] drm/radeon/kms: add missing copy from user

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Message-Id: <20100824224504.066419792@clark.site>
Date:	Tue, 24 Aug 2010 15:44:37 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"Dr. David Alan Gilbert" <linux@...blig.org>,
	Dave Airlie <airlied@...hat.com>
Subject: [032/114] drm/radeon/kms: add missing copy from user

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Dr. David Alan Gilbert <linux@...blig.org>

commit d8ab35575098b2d6dc10b2535aeb40545933ae56 upstream.

This hasn't mattered up until the ioctl started using the value, and it fell
apart.

fixes fd.o 29340, Ubuntu LP 606081

[airlied: cleaned up whitespace and don't need an error before pushing]

Signed-off-by: Dr. David Alan Gilbert <linux@...blig.org>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/radeon/radeon_kms.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -106,7 +106,9 @@ int radeon_info_ioctl(struct drm_device
 
 	info = data;
 	value_ptr = (uint32_t *)((unsigned long)info->value);
-	value = *value_ptr;
+	if (DRM_COPY_FROM_USER(&value, value_ptr, sizeof(value)))
+		return -EFAULT;
+
 	switch (info->request) {
 	case RADEON_INFO_DEVICE_ID:
 		value = dev->pci_device;


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