On Fri, May 22, 2020 at 6:24 PM Dan Carpenter <dan.carpen...@oracle.com> wrote:
>
> On Thu, May 14, 2020 at 01:53:16AM +0530, Souptick Joarder wrote:
> > First, when memory allocation for sg_list_unaligned failed, there
> > is no point of calling put_pages() as we haven't pinned any pages.
> >
> > Second, if get_user_pages_fast() failed we should unpinned num_pinned
> > pages, no point of checking till num_pages.
> >
> > This will address both.
> >
> > Signed-off-by: Souptick Joarder <jrdr.li...@gmail.com>
>
> If gup_flags were | FOLL_LONGTERM then this patch would fix a double
> free because of the put_page() in __gup_longterm_locked().
>
> mm/gup.c
> 1786 if (check_dax_vmas(vmas_tmp, rc)) {
> 1787 for (i = 0; i < rc; i++)
> 1788 put_page(pages[i]);
> ^^^^^^^^^^^^^^^^^^^
> put_page() here and also in the caller.
>
> 1789 rc = -EOPNOTSUPP;
> 1790 goto out;
> 1791 }
>
> But since this isn't FOLL_LONGTERM the patch is a nice cleanup which
> doesn't affect run time.
>
> Reviewed-by: Dan Carpenter <dan.carpen...@oracle.com>
Hi Andrew,
Is it fine to take it through mm tree ?
