From: Andrey Ryabinin <a.ryabinin@samsung.com>
Date: Wed, 7 May 2014 07:07:25 +0000 (+0100)
Subject: ARM: 8051/1: put_user: fix possible data corruption in put_user
X-Git-Tag: v3.2.61~112
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f85743e62e15955caa5da907f5a2b02b351722d3;p=pandora-kernel.git

ARM: 8051/1: put_user: fix possible data corruption in put_user

commit 537094b64b229bf3ad146042f83e74cf6abe59df upstream.

According to arm procedure call standart r2 register is call-cloberred.
So after the result of x expression was put into r2 any following
function call in p may overwrite r2. To fix this, the result of p
expression must be saved to the temporary variable before the
assigment x expression to __r2.

Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Reviewed-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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