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Add upper bound checks in PMU capabilities processing to harden against malformed perf.data files: - nr_pmu bounded to MAX_PMU_MAPPINGS (4096) in process_pmu_caps() - nr_pmu_caps bounded to MAX_PMU_CAPS (512) in __process_pmu_caps() Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Ian Rogers <irogers@google.com> Assisted-by: Claude Code:claude-opus-4-6 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org>