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cpufreq: apple-soc: Fix null-ptr-deref in apple_soc_cpufreq_get_rate()

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[ Upstream commit 9992649f6786921873a9b89dafa5e04d8c5fef2b ]

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

Fixes: 6286bbb405 ("cpufreq: apple-soc: Add new driver to control Apple SoC CPU P-states")
Signed-off-by: Henry Martin <bsdhenrymartin@gmail.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
2025-04-09 20:48:13 +08:00
committed by Greg Kroah-Hartman
parent 92d55d7051
commit 1053dcf8a5
1 changed files with 8 additions and 2 deletions
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10
drivers/cpufreq/apple-soc-cpufreq.c
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@@ -103,11 +103,17 @@ static const struct of_device_id apple_soc_cpufreq_of_match[] = {
static unsigned int apple_soc_cpufreq_get_rate(unsigned int cpu)
{
struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);
struct apple_cpu_priv *priv = policy->driver_data;
struct cpufreq_policy *policy;
struct apple_cpu_priv *priv;
struct cpufreq_frequency_table *p;
unsigned int pstate;
policy = cpufreq_cpu_get_raw(cpu);
if (unlikely(!policy))
return 0;
priv = policy->driver_data;
if (priv->info->cur_pstate_mask) {
u64 reg = readq_relaxed(priv->reg_base + APPLE_DVFS_STATUS);