Commit a78e7207 authored by Jinjie Ruan's avatar Jinjie Ruan Committed by Viresh Kumar
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cpufreq: CPPC: Fix possible null-ptr-deref for cpufreq_cpu_get_raw() 



cpufreq_cpu_get_raw() may return NULL if the cpu is not in
policy->cpus cpu mask and it will cause null pointer dereference.

Fixes: 740fcdc2 ("cpufreq: CPPC: Register EM based on efficiency class information")
Signed-off-by: default avatarJinjie Ruan <ruanjinjie@huawei.com>
Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
parent 96b97648

drivers/cpufreq/cppc_cpufreq.c

+3 −0
Original line number Diff line number Diff line
@@ -404,6 +404,9 @@ static int cppc_get_cpu_power(struct device *cpu_dev, 
	struct cppc_cpudata *cpu_data;



	policy = cpufreq_cpu_get_raw(cpu_dev->id);

	if (!policy)

		return 0;



	cpu_data = policy->driver_data;

	perf_caps = &cpu_data->perf_caps;

	max_cap = arch_scale_cpu_capacity(cpu_dev->id);