From a78e7207564258db6e373e86294a85f9d646d35a Mon Sep 17 00:00:00 2001 From: Jinjie Ruan Date: Wed, 30 Oct 2024 09:20:19 +0800 Subject: [PATCH] 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: 740fcdc2c20e ("cpufreq: CPPC: Register EM based on efficiency class information") Signed-off-by: Jinjie Ruan Signed-off-by: Viresh Kumar --- drivers/cpufreq/cppc_cpufreq.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c index fd3e328a2d578..309cca11b2396 100644 --- a/drivers/cpufreq/cppc_cpufreq.c +++ b/drivers/cpufreq/cppc_cpufreq.c @@ -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); -- 2.39.5