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cpufreq: scmi: Fix null-ptr-deref in scmi_cpufreq_get_rate()

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cpufreq_cpu_get_raw() can return NULL when the target CPU is not present
in the policy->cpus mask. scmi_cpufreq_get_rate() does not check for
this case, which results in a NULL pointer dereference.

Add NULL check after cpufreq_cpu_get_raw() to prevent this issue.

Fixes: 99d6bdf338 ("cpufreq: add support for CPU DVFS based on SCMI message protocol")
Signed-off-by: Henry Martin <bsdhenrymartin@gmail.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Henry Martin 2025-04-08 23:03:53 +08:00 committed by Viresh Kumar
parent 9992649f67
commit 484d3f15cc
1 changed files with 8 additions and 2 deletions
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10
drivers/cpufreq/scmi-cpufreq.c
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@ -37,11 +37,17 @@ static struct cpufreq_driver scmi_cpufreq_driver;
static unsigned int scmi_cpufreq_get_rate(unsigned int cpu)
{
struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);
struct scmi_data *priv = policy->driver_data;
struct cpufreq_policy *policy;
struct scmi_data *priv;
unsigned long rate;
int ret;
policy = cpufreq_cpu_get_raw(cpu);
if (unlikely(!policy))
return 0;
priv = policy->driver_data;
ret = perf_ops->freq_get(ph, priv->domain_id, &rate, false);
if (ret)
return 0;