linux-kernel - [PATCH] perf: python: Reference Py

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Date:   Thu, 22 Mar 2018 00:57:32 +0100
From:   Petr Machata <petrm@...lanox.com>
To:     linux-kernel@...r.kernel.org
CC:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Petr Machata <petrm@...lanox.com>
Subject: [PATCH] perf: python: Reference Py_None before
 returning it

Python None objects are handled just like all the other objects with
respect to their reference counting. Before returning Py_None, its
reference count thus needs to be bumped.

Signed-off-by: Petr Machata <petrm@...lanox.com>
---
 tools/perf/util/python.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index b1e999b..762d429 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -967,8 +967,10 @@ static PyObject *pyrf_evlist__read_on_cpu(struct pyrf_evlist *pevlist,
 			return PyErr_NoMemory();
 
 		evsel = perf_evlist__event2evsel(evlist, event);
-		if (!evsel)
+		if (!evsel) {
+			Py_INCREF(Py_None);
 			return Py_None;
+		}
 
 		pevent->evsel = evsel;
 
-- 
2.4.3