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| author | Jinjie Ruan <ruanjinjie@huawei.com> | 2024-10-30 09:20:19 +0800 |
|---|---|---|
| committer | Viresh Kumar <viresh.kumar@linaro.org> | 2024-10-30 08:48:36 +0530 |
| commit | a78e7207564258db6e373e86294a85f9d646d35a (patch) | |
| tree | 426cc5ab89652a59f103166b8d9daea85b1bd6d7 /drivers/cpufreq/cppc_cpufreq.c | |
| parent | 96b9764864893b472206a7a324037ee903acc815 (diff) | |
| download | lwn-a78e7207564258db6e373e86294a85f9d646d35a.tar.gz lwn-a78e7207564258db6e373e86294a85f9d646d35a.zip | |
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 <ruanjinjie@huawei.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/cpufreq/cppc_cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/cppc_cpufreq.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c index fd3e328a2d57..309cca11b239 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); |