hugetlb: fix handling of parse errors in sysfs
authorEric B Munson <emunson@mgebm.net>
Thu, 13 Jan 2011 23:47:28 +0000 (15:47 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 14 Jan 2011 01:32:49 +0000 (17:32 -0800)
commit73ae31e5986a4c0ee84bfd13ccd9b57a98956f6f
tree03e8c6e4559d5f77ec8f0fdf79addeecbef65ed9
parentadbe8726dc2a3805630d517270db17e3af86e526
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: 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>
mm/hugetlb.c