Commit c7785c3a authored by Jinjie Ruan's avatar Jinjie Ruan Committed by Yuntao Liu
Browse files

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

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=e07570a8f2cfc51260c6266cb8e1bd4777a610d6



--------------------------------

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>
Signed-off-by: default avatarYuntao Liu <liuyuntao12@huawei.com>
parent b54f81e4

drivers/cpufreq/cppc_cpufreq.c

+3 −0
Original line number Diff line number Diff line
@@ -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);