From: Anastasia Belova abelova@astralinux.ru

mainline inclusion from mainline-v6.12-rc1 commit 5493f9714e4cdaf0ee7cec15899a231400cb1a9f category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYRBF CVE: CVE-2024-50009

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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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 Signed-off-by: Bowen You youbowen2@huawei.com --- drivers/cpufreq/amd-pstate.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index f5bf884e9189..cbf3038f962c 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -586,7 +586,12 @@ 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); @@ -810,11 +815,16 @@ 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;

From: Mario Limonciello mario.limonciello@amd.com

mainline inclusion from mainline-v6.11-rc6 commit 9983a9cd4d429dc9ca01770083c4c1f366214b65 category: bugfix bugzilla: 190359

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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If a system is using preferred cores the highest perf will be inconsistent as it can change from system events.

Skip the checks for it.

Fixes: e571a5e2068e ("cpufreq: amd-pstate: Update amd-pstate preferred core ranking dynamically") Reviewed-by: Gautham R. Shenoy gautham.shenoy@amd.com Signed-off-by: Mario Limonciello mario.limonciello@amd.com Signed-off-by: Bowen You youbowen2@huawei.com --- drivers/cpufreq/amd-pstate-ut.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/cpufreq/amd-pstate-ut.c b/drivers/cpufreq/amd-pstate-ut.c index f5e0151f5008..99167e01604c 100644 --- a/drivers/cpufreq/amd-pstate-ut.c +++ b/drivers/cpufreq/amd-pstate-ut.c @@ -159,14 +159,17 @@ static void amd_pstate_ut_check_perf(u32 index) lowest_perf = AMD_CPPC_LOWEST_PERF(cap1); }

- if ((highest_perf != READ_ONCE(cpudata->highest_perf)) || - (nominal_perf != READ_ONCE(cpudata->nominal_perf)) || + if (highest_perf != READ_ONCE(cpudata->highest_perf) && !cpudata->hw_prefcore) { + pr_err("%s cpu%d highest=%d %d highest perf doesn't match\n", + __func__, cpu, highest_perf, cpudata->highest_perf); + goto skip_test; + } + if ((nominal_perf != READ_ONCE(cpudata->nominal_perf)) || (lowest_nonlinear_perf != READ_ONCE(cpudata->lowest_nonlinear_perf)) || (lowest_perf != READ_ONCE(cpudata->lowest_perf))) { amd_pstate_ut_cases[index].result = AMD_PSTATE_UT_RESULT_FAIL; - pr_err("%s cpu%d highest=%d %d nominal=%d %d lowest_nonlinear=%d %d lowest=%d %d, they should be equal!\n", - __func__, cpu, highest_perf, cpudata->highest_perf, - nominal_perf, cpudata->nominal_perf, + pr_err("%s cpu%d nominal=%d %d lowest_nonlinear=%d %d lowest=%d %d, they should be equal!\n", + __func__, cpu, nominal_perf, cpudata->nominal_perf, lowest_nonlinear_perf, cpudata->lowest_nonlinear_perf, lowest_perf, cpudata->lowest_perf); goto skip_test;