[Mesa-dev] [PATCH] virgl: fix caps ioctl size check.

[Dave Airlie]

From: Dave Airlie <airlied at redhat.com>

The size check seems backwards, if userspace gives us a size
larger it is probably asking for a newer version of the caps,
so we just fill in the caps version we have at the smaller
size, and it can work it out from there.

Userspace will probably still need a fallback as old
kernel are out there.

Cc: <stable at vger.kernel.org>
Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 5720a0d4ac0a..5d5f79508100 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -497,7 +497,7 @@ static int virtio_gpu_get_caps_ioctl(struct drm_device *dev,
 	}
 
 	size = vgdev->capsets[found_valid].max_size;
-	if (args->size > size) {
+	if (size > args->size) {
 		spin_unlock(&vgdev->display_info_lock);
 		return -EINVAL;
 	}
-- 
2.14.3