[Bug dynamic-link/34565] New: __cpuid_count is called with sub-leaf == 1 without checking if supported

https://sourceware.org/bugzilla/show_bug.cgi?id=34565

            Bug ID: 34565
           Summary: __cpuid_count is called with sub-leaf == 1 without
                    checking if supported
           Product: glibc
           Version: 2.45
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---
            Target: x86

sysdeps/x86/cpu-features.c has

  if (cpu_features->basic.max_cpuid >= 7)
    {
      __cpuid_count (7, 0,
                     cpu_features->features[CPUID_INDEX_7].cpuid.eax,
                     cpu_features->features[CPUID_INDEX_7].cpuid.ebx,
                     cpu_features->features[CPUID_INDEX_7].cpuid.ecx,
                     cpu_features->features[CPUID_INDEX_7].cpuid.edx);
      __cpuid_count (7, 1,
                     cpu_features->features[CPUID_INDEX_7_ECX_1].cpuid.eax,
                     cpu_features->features[CPUID_INDEX_7_ECX_1].cpuid.ebx,
                     cpu_features->features[CPUID_INDEX_7_ECX_1].cpuid.ecx,
                     cpu_features->features[CPUID_INDEX_7_ECX_1].cpuid.edx);
    }

Before calling __cpuid_count (0xd, 1, ...), we should first check if
sub-leaf 1 is supported

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