tree 746795d32d38c8c0affefa22c6c1154d2ddd4e32
parent f9ff907b0af561dcde4683f7c9f71dc0f41d3be3
author Andrey Ryabinin <a.ryabinin@samsung.com> 1399446445 +0100
committer Russell King <rmk+kernel@arm.linux.org.uk> 1401057865 +0100

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

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>
Cc: stable@vger.kernel.org
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>