From: Jinjie Ruan <ruanjinjie@huawei.com> stable inclusion from stable-v6.6.64 commit e07570a8f2cfc51260c6266cb8e1bd4777a610d6 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEAEU CVE: CVE-2024-53231 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- 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 <ruanjinjie@huawei.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Yuntao Liu <liuyuntao12@huawei.com> --- 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 387fc2f984ce..dda81616b968 100644 --- a/drivers/cpufreq/cppc_cpufreq.c +++ b/drivers/cpufreq/cppc_cpufreq.c @@ -431,6 +431,9 @@ 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); -- 2.34.1