linux-kernel - Re: [PATCH] mm: fix null pointer dereference in wait_iff

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Message-ID: <CA+icZUV1kOPogpd6cuwUUFy=MK8AqArVW+XgAPDLpAKyWLUShg@mail.gmail.com>
Date:	Sat, 29 Dec 2012 09:45:27 +0100
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Zlatko Calusic <zlatko.calusic@...on.hr>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Zhouping Liu <zliu@...hat.com>
Subject: Re: [PATCH] mm: fix null pointer dereference in wait_iff_congested()

Just FYI:

This patch landed upstream [1].
Thanks for all involved people.

- Sedat -

[1] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=ecccd1248d6e6986130ffcc3b0d003cb46a485c0

On Fri, Dec 28, 2012 at 3:16 AM, Zlatko Calusic <zlatko.calusic@...on.hr> wrote:
> From: Zlatko Calusic <zlatko.calusic@...on.hr>
>
> The unintended consequence of commit 4ae0a48b is that
> wait_iff_congested() can now be called with NULL struct zone*
> producing kernel oops like this:
>
> BUG: unable to handle kernel NULL pointer dereference
> IP: [<ffffffff811542d9>] wait_iff_congested+0x59/0x140
>
> This trivial patch fixes it.
>
> Reported-by: Zhouping Liu <zliu@...hat.com>
> Reported-and-tested-by: Sedat Dilek <sedat.dilek@...il.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Mel Gorman <mgorman@...e.de>
> Cc: Hugh Dickins <hughd@...gle.com>
> Signed-off-by: Zlatko Calusic <zlatko.calusic@...on.hr>
> ---
>  mm/vmscan.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 02bcfa3..e55ce55 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -2782,7 +2782,7 @@ loop_again:
>                 if (total_scanned && (sc.priority < DEF_PRIORITY - 2)) {
>                         if (has_under_min_watermark_zone)
>                                 count_vm_event(KSWAPD_SKIP_CONGESTION_WAIT);
> -                       else
> +                       else if (unbalanced_zone)
>                                 wait_iff_congested(unbalanced_zone, BLK_RW_ASYNC, HZ/10);
>                 }
>
> --
> 1.8.1.rc3
>
> --
> Zlatko
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