From: Sasha Levin <levinsasha928@gmail.com>
Date: Thu, 10 May 2012 20:01:44 +0000 (-0700)
Subject: mm: fix division by 0 in percpu_pagelist_fraction()
X-Git-Tag: v3.4-rc7~13^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=93278814d3590eba0ee360b8d69a35c7f2203ea8;p=pandora-kernel.git

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>
---

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