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hugetlb: fix handling of parse errors in sysfs

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When parsing changes to the huge page pool sizes made from userspace via
the sysfs interface, bogus input values are being covered up by
nr_hugepages_store_common and nr_overcommit_hugepages_store returning 0
when strict_strtoul returns an error.  This can cause an infinite loop in
the nr_hugepages_store code.  This patch changes the return value for
these functions to -EINVAL when strict_strtoul returns an error.

Signed-off-by: Eric B Munson <emunson@mgebm.net>
Reported-by: CAI Qian <caiqian@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Eric B Munson <emunson@mgebm.net>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric B Munson 2011-01-13 15:47:28 -08:00 committed by Linus Torvalds
parent adbe8726dc
commit 73ae31e598
1 changed files with 2 additions and 4 deletions
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6
mm/hugetlb.c
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@ -1375,10 +1375,8 @@ static ssize_t nr_hugepages_store_common(bool obey_mempolicy,
NODEMASK_ALLOC(nodemask_t, nodes_allowed, GFP_KERNEL | __GFP_NORETRY);
err = strict_strtoul(buf, 10, &count);
if (err) {
err = 0; /* This seems wrong */
if (err)
goto out;
}
h = kobj_to_hstate(kobj, &nid);
if (h->order >= MAX_ORDER) {
@ -1469,7 +1467,7 @@ static ssize_t nr_overcommit_hugepages_store(struct kobject *kobj,
err = strict_strtoul(buf, 10, &input);
if (err)
return 0;
return err;
spin_lock(&hugetlb_lock);
h->nr_overcommit_huge_pages = input;