On Sun, Sep 13, 2020 at 08:02:35PM +0530, Souptick Joarder wrote:
> It is possible that a buggy caller of unpin_user_pages()
> (specially in error handling path) may end up calling it with
> npages < 0 which is unnecessary.
> @@ -328,6 +328,9 @@ void unpin_user_pages(struct page **pages, unsigned long npages)
> {
> unsigned long index;
>
> + if (WARN_ON_ONCE(npages < 0))
> + return;
But npages is unsigned long. So it can't be less than zero.
