From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 20 Oct 2014 11:07:50 +0000 (+0400)
Subject: clockevents: Prevent shift out of bounds
X-Git-Tag: omap-for-v3.19/fixes-not-urgent-part1~33^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=10632008b9e18b76cbff0ffc69c15e948aa548e0;p=pandora-kernel.git

clockevents: Prevent shift out of bounds

Andrey reported that on a kernel with UBSan enabled he found:

     UBSan: Undefined behaviour in ../kernel/time/clockevents.c:75:34

     I guess it should be 1ULL here instead of 1U:
            (!ismax || evt->mult <= (1U << evt->shift)))

That's indeed the correct solution because shift might be 32.

Reported-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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