6.6-stable review patch. If anyone has any objections, please let me know.
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From: Anastasia Belova abelova@astralinux.ru
commit 5493f9714e4cdaf0ee7cec15899a231400cb1a9f upstream.
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 [ Raj: on 6.6, there don't have function amd_pstate_update_limits() so applied the NULL checking in amd_pstate_adjust_perf() only ] Signed-off-by: Rajani Kantha rajanikantha@engineer.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/cpufreq/amd-pstate.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
--- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -579,8 +579,13 @@ static void amd_pstate_adjust_perf(unsig unsigned long max_perf, min_perf, des_perf, cap_perf, lowest_nonlinear_perf, max_freq; struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); - struct amd_cpudata *cpudata = policy->driver_data; unsigned int target_freq; + 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);