From: Maxime Bizon <mbizon@freebox.fr>
Date: Mon, 22 Oct 2012 09:19:28 +0000 (+0200)
Subject: pstore/ram: Fix undefined usage of rounddown_pow_of_two(0)
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~4^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b042e47491ba5f487601b5141a3f1d8582304170;p=pandora-kernel.git

pstore/ram: Fix undefined usage of rounddown_pow_of_two(0)

record_size / console_size / ftrace_size can be 0 (this is how you disable
the feature), but rounddown_pow_of_two(0) is undefined. As suggested by
Kees Cook, use !is_power_of_2() as a condition to call
rounddown_pow_of_two and avoid its undefined behavior on the value 0. This
issue has been present since commit 1894a253 (ramoops: Move to
fs/pstore/ram.c).

Cc: stable@vger.kernel.org
Signed-off-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: Florian Fainelli <ffainelli@freebox.fr>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
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