From: Arnaldo Carvalho de Melo <a...@redhat.com>

[ Upstream commit d95daf5accf4a72005daa13fbb1d1bd8709f2861 ]

When perf_add_probe_events() we call cleanup_perf_probe_events() for the
pev pointer it receives, then, as part of handling this failure the main
'perf probe' goes on and calls cleanup_params() and that will again call
cleanup_perf_probe_events()for the same pointer, so just set nevents to
zero when handling the failure of perf_add_probe_events() to avoid the
double free.

Cc: Adrian Hunter <adrian.hun...@intel.com>
Cc: Jiri Olsa <jo...@kernel.org>
Cc: Masami Hiramatsu <mhira...@kernel.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Link: https://lkml.kernel.org/n/tip-x8qgma4g813z96dvtw9w2...@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 tools/perf/builtin-probe.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 9d4ac90ca87e4..66fb1d53d0f08 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -613,6 +613,16 @@ __cmd_probe(int argc, const char **argv, const char 
*prefix __maybe_unused)
 
                ret = perf_add_probe_events(params.events, params.nevents);
                if (ret < 0) {
+
+                       /*
+                        * When perf_add_probe_events() fails it calls
+                        * cleanup_perf_probe_events(pevs, npevs), i.e.
+                        * cleanup_perf_probe_events(params.events, 
params.nevents), which
+                        * will call clear_perf_probe_event(), so set nevents 
to zero
+                        * to avoid cleanup_params() to call 
clear_perf_probe_event() again
+                        * on the same pevs.
+                        */
+                       params.nevents = 0;
                        pr_err_with_code("  Error: Failed to add events.", ret);
                        return ret;
                }
-- 
2.20.1

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