linux-kernel - Re: [RFC 1/2] staging: ion: shrink page-pool by page unit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAOFgiypyxykRPpYn7dAXnnDHhCR-MwRnNT46BdwS28TKobnxuw@mail.gmail.com>
Date:	Fri, 24 Oct 2014 02:06:17 +0530
From:	Devendra Naga <devendranaga4@...il.com>
To:	Gioh Kim <gioh.kim@....com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	John Stultz <john.stultz@...aro.org>,
	Rebecca Schultz Zavin <rebecca@...roid.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	gunho.lee@....com
Subject: Re: [RFC 1/2] staging: ion: shrink page-pool by page unit

Hello,

On Thu, Oct 23, 2014 at 6:22 PM, Gioh Kim <gioh.kim@....com> wrote:
> This patch shrink page-pool by page unit.
>
> Signed-off-by: Gioh Kim <gioh.kim@....com>
> ---
>  drivers/staging/android/ion/ion_page_pool.c   |    5 +++--
>  drivers/staging/android/ion/ion_system_heap.c |    7 +++++--
>  2 files changed, 8 insertions(+), 4 deletions(-)

>

--- cut --

> diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
> index da2a63c..36e73c3 100644
> --- a/drivers/staging/android/ion/ion_system_heap.c
> +++ b/drivers/staging/android/ion/ion_system_heap.c
> @@ -211,7 +211,7 @@ static int ion_system_heap_shrink(struct ion_heap *heap, gfp_t gfp_mask,
>                                         int nr_to_scan)
>  {
>         struct ion_system_heap *sys_heap;
> -       int nr_total = 0;
> +       int nr_total = 0, nr_freed;
>         int i;
>
>         sys_heap = container_of(heap, struct ion_system_heap, heap);
> @@ -219,7 +219,10 @@ static int ion_system_heap_shrink(struct ion_heap *heap, gfp_t gfp_mask,
>         for (i = 0; i < num_orders; i++) {
>                 struct ion_page_pool *pool = sys_heap->pools[i];
>
> -               nr_total += ion_page_pool_shrink(pool, gfp_mask, nr_to_scan);
> +               nr_freed += ion_page_pool_shrink(pool, gfp_mask, nr_to_scan);

nr_freed is not initialised to zero. This might result in updating of
a garbage value stored initially after nr_freed is created.

> +               nr_total += nr_freed;
> +               /* nr_to_scan can be negative */
> +               nr_to_scan -= nr_freed;
>         }
>
>         return nr_total;
> --
> 1.7.9.5
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/