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Message-Id: <1382239876-12688-1-git-send-email-geyslan@gmail.com> Date: Sun, 20 Oct 2013 00:31:16 -0300 From: "Geyslan G. Bem" <geyslan@...il.com> To: kernel-br@...glegroups.com Cc: "Geyslan G. Bem" <geyslan@...il.com>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Viresh Kumar <viresh.kumar@...aro.org>, cpufreq@...r.kernel.org (open list:CPU FREQUENCY DRI...), linux-pm@...r.kernel.org (open list:CPU FREQUENCY DRI...), linux-kernel@...r.kernel.org (open list) Subject: [PATCH] cpufreq: intel_pstate: fix possible integer overflow The expression 'pstate << 8' is evaluated using 32-bit arithmetic while 'val' expects an expression of type u64. Signed-off-by: Geyslan G. Bem <geyslan@...il.com> --- drivers/cpufreq/intel_pstate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index badf620..43446b5 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -395,7 +395,7 @@ static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate) trace_cpu_frequency(pstate * 100000, cpu->cpu); cpu->pstate.current_pstate = pstate; - val = pstate << 8; + val = (u64)pstate << 8; if (limits.no_turbo) val |= (u64)1 << 32; -- 1.8.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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