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

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BugLink: https://bugs.launchpad.net/bugs/2101915

[ Upstream commit 1a1374bb8c5926674973d849feed500bc61ad535 ]

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: 740fcdc2c2 ("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: Sasha Levin <sashal@kernel.org>
CVE-2024-53230
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Jinjie Ruan
2025-03-11 08:51:19 +09:00
committed by Stefan Bader
parent 79179a800e
commit fbb88f0b3a
1 changed files with 3 additions and 0 deletions
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drivers/cpufreq/cppc_cpufreq.c
+3
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@@ -498,6 +498,9 @@ 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);