perf env: Use zfree() to reduce chances of use after free

Do defensive programming by using zfree() to initialize freed pointers
to NULL, so that eventual use after free result in a NULL pointer deref
instead of more subtle behaviour.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index 5b8cf6a421a4951df882cdd9b119c70bf1407635..ebf2e801c275f97455fcb5f5d5d943fcc823d138 100644 (file)
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -149,7 +149,7 @@ static void perf_env__purge_bpf(struct perf_env *env)
                node = rb_entry(next, struct bpf_prog_info_node, rb_node);
                next = rb_next(&node->rb_node);
                rb_erase(&node->rb_node, root);
-               free(node->info_linear);
+               zfree(&node->info_linear);
                free(node);
        }