Commit 73ae31e5 authored by Eric B Munson's avatar Eric B Munson Committed by Linus Torvalds

hugetlb: fix handling of parse errors in sysfs

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: default avatarEric B Munson <>
Reported-by: default avatarCAI Qian <>
Cc: Andrea Arcangeli <>
Cc: Eric B Munson <>
Cc: Michal Hocko <>
Cc: Nishanth Aravamudan <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent adbe8726
......@@ -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;
h->nr_overcommit_huge_pages = input;
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