diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 08ac53c5f78d7402bed71fbd25f99a31d55f5082..864aab4b1bfa77ff95eb9c83d7584e6e4b6ed95f 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2715,15 +2715,10 @@ static long btrfs_ioctl_file_extent_same(struct file *file,
 	size = sizeof(tmp) +
 		tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info);
 
-	same = kmalloc(size, GFP_NOFS);
-	if (!same) {
-		ret = -EFAULT;
-		goto out;
-	}
+	same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size);
 
-	if (copy_from_user(same,
-			   (struct btrfs_ioctl_same_args __user *)argp, size)) {
-		ret = -EFAULT;
+	if (IS_ERR(same)) {
+		ret = PTR_ERR(same);
 		goto out;
 	}