virtio-gpu: Use memdup_user() rather than duplicating its implementation

Reuse existing functionality from memdup_user() instead of keeping
duplicate source code.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/401e68fc-5515-7a7a-be2e-503dee676b34@users.sourceforge.net

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index c046903..512e7cd 100644 (file)
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -152,15 +152,10 @@ static int virtio_gpu_execbuffer(struct drm_device *dev,
        if (ret)
                goto out_free;
 
-       buf = kmalloc(exbuf->size, GFP_KERNEL);
-       if (!buf) {
-               ret = -ENOMEM;
-               goto out_unresv;
-       }
-       if (copy_from_user(buf, (void __user *)(uintptr_t)exbuf->command,
-                          exbuf->size)) {
-               kfree(buf);
-               ret = -EFAULT;
+       buf = memdup_user((void __user *)(uintptr_t)exbuf->command,
+                         exbuf->size);
+       if (IS_ERR(buf)) {
+               ret = PTR_ERR(buf);
                goto out_unresv;
        }
        virtio_gpu_cmd_submit(vgdev, buf, exbuf->size,