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cpufreq: amd-pstate: add check for cpufreq_cpu_get's return value

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cpufreq_cpu_get may return NULL. To avoid NULL-dereference check it
and return in case of error.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Anastasia Belova <abelova@astralinux.ru>
Reviewed-by: Perry Yuan <perry.yuan@amd.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Anastasia Belova 2024-08-26 16:38:41 +03:00 committed by Viresh Kumar
parent b14ceb82c3
commit 5493f9714e
1 changed files with 12 additions and 2 deletions
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14
drivers/cpufreq/amd-pstate.c
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@ -659,7 +659,12 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
unsigned long max_perf, min_perf, des_perf,
cap_perf, lowest_nonlinear_perf;
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
struct amd_cpudata *cpudata = policy->driver_data;
struct amd_cpudata *cpudata;
if (!policy)
return;
cpudata = policy->driver_data;
if (policy->min != cpudata->min_limit_freq || policy->max != cpudata->max_limit_freq)
amd_pstate_update_min_max_limit(policy);
@ -873,11 +878,16 @@ static void amd_pstate_init_prefcore(struct amd_cpudata *cpudata)
static void amd_pstate_update_limits(unsigned int cpu)
{
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
struct amd_cpudata *cpudata = policy->driver_data;
struct amd_cpudata *cpudata;
u32 prev_high = 0, cur_high = 0;
int ret;
bool highest_perf_changed = false;
if (!policy)
return;
cpudata = policy->driver_data;
mutex_lock(&amd_pstate_driver_lock);
if ((!amd_pstate_prefcore) || (!cpudata->hw_prefcore))
goto free_cpufreq_put;