diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index f597f7e68e50..260dcaf35123 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -3295,6 +3295,9 @@ static ssize_t __fuse_copy_file_range(struct file *file_in, loff_t pos_in,
 		fc->no_copy_file_range = 1;
 		err = -EOPNOTSUPP;
 	}
+	if (!err && outarg.size > len)
+		err = -EIO;
+
 	if (err)
 		goto out;