In some cases, ncpus used for perf_evsel__alloc_fd and for perf_evsel__close are not the same, this is causing memory overwrite/corruption.
Fixing issue by using same ncpus in perf_evsel__alloc_fd. This bug is more evident on arm64 platforms, which uses cpu_map(cpus) for PMU core devices. Signed-off-by: Ganapatrao Kulkarni <[email protected]> --- tools/perf/util/evsel.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index ac59710..0dc94d7 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1489,7 +1489,9 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus, nthreads = threads->nr; if (evsel->fd == NULL && - perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0) + perf_evsel__alloc_fd(evsel, + evsel->cpus ? evsel->cpus->nr : cpus->nr, + nthreads) < 0) return -ENOMEM; if (evsel->cgrp) { -- 1.8.1.4
