From 85390378f0a6abf3bdb10c3d504d77862a2d0ec9 Mon Sep 17 00:00:00 2001
From: Joel Stanley <joel@jms.id.au>
Date: Thu, 24 Apr 2014 16:55:35 +0930
Subject: [PATCH] powerpc/powernv: Check sysfs size before copying

The sysparam code currently uses the userspace supplied number of
bytes when memcpy()ing in to a local 64-byte buffer.

Limit the maximum number of bytes by the size of the buffer.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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