mm: fix division by 0 in percpu_pagelist_fraction()
authorSasha Levin <levinsasha928@gmail.com>
Thu, 10 May 2012 20:01:44 +0000 (13:01 -0700)
committerVarun Wadekar <vwadekar@nvidia.com>
Fri, 18 May 2012 10:36:48 +0000 (15:36 +0530)
commit056de96d166e6bc352d67134f40d5af4e78b263c
treebe5864cb2f07eb02d4b8d36a41c4fde05f6b0831
parent0fb90fdbbde5743eb59472028680ad315a7ea465
mm: fix division by 0 in percpu_pagelist_fraction()

percpu_pagelist_fraction_sysctl_handler() has only considered -EINVAL as
a possible error from proc_dointvec_minmax().

If any other error is returned, it would proceed to divide by zero since
percpu_pagelist_fraction wasn't getting initialized at any point.  For
example, writing 0 bytes into the proc file would trigger the issue.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Reviewed-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/page_alloc.c