linux-kernel - [PATCH] perf script: fix double free on command

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Date:	Tue,  1 Mar 2016 23:46:20 +0000
From:	Colin King <colin.king@...onical.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Javi Merino <javi.merino@....com>,
	He Kuang <hekuang@...wei.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] perf script: fix double free on command_line

From: Colin Ian King <colin.king@...onical.com>

command_line is free'd twice if db_export__branch_types fails. To
avoid this, defer the free'ing of command_line to after this call
so that the error return path will just free command_line once.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 tools/perf/util/scripting-engines/trace-event-python.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index d72fafc..e982863 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -1091,8 +1091,6 @@ static int python_start_script(const char *script, int argc, const char **argv)
 		goto error;
 	}
 
-	free(command_line);
-
 	set_table_handlers(tables);
 
 	if (tables->db_export_mode) {
@@ -1101,6 +1099,8 @@ static int python_start_script(const char *script, int argc, const char **argv)
 			goto error;
 	}
 
+	free(command_line);
+
 	return err;
 error:
 	Py_Finalize();
-- 
2.7.0