tree 17784192015e71464f1064af2b071c8cd7fe7f13
parent 16fbdce62d9c89b794e303f4a232e4749b77e9ac
author Sasha Levin <levinsasha928@gmail.com> 1336680104 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1336687604 -0700

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>