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

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[ Upstream commit 484d3f15cc ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
[Shivani: Modified to apply on 5.10.y]
Signed-off-by: Shivani Agarwal <shivani.agarwal@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Henry Martin
2026-01-05 01:57:01 -08:00
committed by Greg Kroah-Hartman
parent 0af745fdde
commit bd1dcfba72
1 changed files with 8 additions and 2 deletions
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drivers/cpufreq/scmi-cpufreq.c
+8 -2
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@@ -29,12 +29,18 @@ static const struct scmi_handle *handle;
static unsigned int scmi_cpufreq_get_rate(unsigned int cpu)
{
struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);
struct cpufreq_policy *policy;
struct scmi_data *priv;
const struct scmi_perf_ops *perf_ops = handle->perf_ops;
struct scmi_data *priv = policy->driver_data;
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(handle, priv->domain_id, &rate, false);
if (ret)
return 0;