[PATCH 1/1] perf probe: Use zfree() to avoid possibly accessing dangling pointers

[Arnaldo Carvalho de Melo <acme@kernel.org>]

When freeing a->b it is good practice to set a->b to NULL using
zfree(&a->b) so that when we have a bug where a reference to a freed 'a'
pointer is kept somewhere, we can more quickly cause a segfault if some
code tries to use a->b.

Convert one such case in the 'perf probe' codebase.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-probe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 019fef8da6a8e60f..003a3bcebfdfc2d1 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -325,7 +325,7 @@ static void cleanup_params(void)
 	for (i = 0; i < params->nevents; i++)
 		clear_perf_probe_event(params->events + i);
 	line_range__clear(&params->line_range);
-	free(params->target);
+	zfree(&params->target);
 	strfilter__delete(params->filter);
 	nsinfo__put(params->nsi);
 	zfree(&params);
-- 
2.44.0