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cpufreq: CPPC: Fix possible null-ptr-deref for cpufreq_cpu_get_raw()

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[ Upstream commit a78e7207564258db6e373e86294a85f9d646d35a ]

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: 740fcdc2c2 ("cpufreq: CPPC: Register EM based on efficiency class information")
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jinjie Ruan
2024-10-30 09:20:19 +08:00
committed by Greg Kroah-Hartman
parent fa5b5ea257
commit a357b63fd2
1 changed files with 3 additions and 0 deletions
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3
drivers/cpufreq/cppc_cpufreq.c
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@@ -422,6 +422,9 @@ static int cppc_get_cpu_power(struct device *cpu_dev,
struct cppc_cpudata *cpu_data; struct cppc_cpudata *cpu_data;
policy = cpufreq_cpu_get_raw(cpu_dev->id); policy = cpufreq_cpu_get_raw(cpu_dev->id);
if (!policy)
return 0;
cpu_data = policy->driver_data; cpu_data = policy->driver_data;
perf_caps = &cpu_data->perf_caps; perf_caps = &cpu_data->perf_caps;
max_cap = arch_scale_cpu_capacity(cpu_dev->id); max_cap = arch_scale_cpu_capacity(cpu_dev->id);