diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index ab3ad2a358cc..dc49e41e1a14 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -9487,15 +9487,21 @@ int smb2_ioctl(struct ksmbd_work *work)
 				rsp);
 		break;
 	case FSCTL_SET_SPARSE:
-		if (in_buf_len < sizeof(struct file_sparse)) {
+	{
+		struct file_sparse sparse = {0};
+
+		if (in_buf_len && in_buf_len < sizeof(struct file_sparse)) {
 			ret = -EINVAL;
 			goto out;
 		}
 
-		ret = fsctl_set_sparse(work, id, (struct file_sparse *)buffer);
+		*(u8 *)&sparse = 1;
+		ret = fsctl_set_sparse(work, id, in_buf_len ?
+				       (struct file_sparse *)buffer : &sparse);
 		if (ret < 0)
 			goto out;
 		break;
+	}
 	case FSCTL_SET_ZERO_DATA:
 	{
 		struct file_zero_data_information *zero_data;