drm/radeon/kms: add missing copy from user
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@treblig.org>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index ddcd3b1..948a2f4 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -112,7 +112,9 @@
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;