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cpufreq: scpi: Fix null-ptr-deref in scpi_cpufreq_get_rate()

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[ Upstream commit 73b24dc731731edf762f9454552cb3a5b7224949 ]

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

Fixes: 343a8d17fa ("cpufreq: scpi: remove arm_big_little dependency")
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>
This commit is contained in:
Henry Martin 2025-04-08 23:03:54 +08:00 • committed by Greg Kroah-Hartman
commit ad4796f2da
1 changed files with 10 additions and 3 deletions
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13
drivers/cpufreq/scpi-cpufreq.c
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@ -39,9 +39,16 @@ static struct scpi_ops *scpi_ops;
static unsigned int scpi_cpufreq_get_rate(unsigned int cpu)
{
struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);
struct scpi_data *priv = policy->driver_data;
unsigned long rate = clk_get_rate(priv->clk);
struct cpufreq_policy *policy;
struct scpi_data *priv;
unsigned long rate;
policy = cpufreq_cpu_get_raw(cpu);
if (unlikely(!policy))
return 0;
priv = policy->driver_data;
rate = clk_get_rate(priv->clk);
return rate / 1000;
}