linux-kernel - Re: [PATCH] Fix handling of parse errors in sysctl

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Date:	Wed, 5 Jan 2011 12:24:24 -0500 (EST)
From:	CAI Qian <caiqian@...hat.com>
To:	Eric B Munson <emunson@...bm.net>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org, mel@....ul.ie,
	stable@...nel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] Fix handling of parse errors in sysctl

Just a minor issue.

----- Original Message -----
> This patch is a candidate for stable.
> 
> ==== CUT HERE ====
> 
> When parsing changes to the huge page pool sizes made from userspace
> via the sysctl interface, bogus input values are being covered up
Those are for sysfs code path. sysctl path should be handled by Michal's
patch touched hugetlb_sysctl_handler_common and hugetlb_overcommit_handler.
> by nr_hugepages_store_common and nr_overcommit_hugepages_store
> returning 0 when strict_strtoul returns an error. This patch changes
> the return value for these functions to -EINVAL when strict_strtoul
> returns an error.
> 
> Reported-by: CAI Qian <caiqian@...hat.com>
> 
> Signed-off-by: Eric B Munson <emunson@...bm.net>
> ---
> mm/hugetlb.c | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 8585524..5cb71a9 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1440,7 +1440,7 @@ static ssize_t nr_hugepages_store_common(bool
> obey_mempolicy,
> 
> err = strict_strtoul(buf, 10, &count);
> if (err)
> - return 0;
> + return -EINVAL;
> 
> h = kobj_to_hstate(kobj, &nid);
> if (nid == NUMA_NO_NODE) {
> @@ -1519,7 +1519,7 @@ static ssize_t
> nr_overcommit_hugepages_store(struct kobject *kobj,
> 
> err = strict_strtoul(buf, 10, &input);
> if (err)
> - return 0;
> + return -EINVAL;
> 
> spin_lock(&hugetlb_lock);
> h->nr_overcommit_huge_pages = input;
> --
> 1.7.1
> 
> --
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