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| author | Jinjie Ruan <ruanjinjie@huawei.com> | 2024-10-30 16:24:49 +0800 |
|---|---|---|
| committer | Viresh Kumar <viresh.kumar@linaro.org> | 2024-10-30 14:38:40 +0530 |
| commit | 1a1374bb8c5926674973d849feed500bc61ad535 (patch) | |
| tree | f20837198f9f45365048e644a249565fc4d38aaf /drivers/cpufreq/cppc_cpufreq.c | |
| parent | a78e7207564258db6e373e86294a85f9d646d35a (diff) | |
| download | lwn-1a1374bb8c5926674973d849feed500bc61ad535.tar.gz lwn-1a1374bb8c5926674973d849feed500bc61ad535.zip | |
cpufreq: CPPC: Fix possible null-ptr-deref for cppc_get_cpu_cost()
cpufreq_cpu_get_raw() may return NULL if the cpu is not in
policy->cpus cpu mask and it will cause null pointer dereference,
so check NULL for cppc_get_cpu_cost().
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 309cca11b239..956d672c6d57 100644 --- a/drivers/cpufreq/cppc_cpufreq.c +++ b/drivers/cpufreq/cppc_cpufreq.c @@ -474,6 +474,9 @@ static int cppc_get_cpu_cost(struct device *cpu_dev, unsigned long KHz, int step; 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); |