From: Petr Machata <petrm@mellanox.com>
Date: Wed, 21 Mar 2018 23:57:32 +0000 (+0100)
Subject: perf python: Reference Py_None before returning it
X-Git-Tag: v4.17-rc1~179^2~6^2~4
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=83428f2fad48e16fddff0cb445cb4fedf5afe4ab;p=thirdparty%2Fkernel%2Flinux.git

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@mellanox.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Machata <petrm@mellanox.com>
Link: http://lkml.kernel.org/r/b1e565ecccf68064d8d54f37db5d028dda8fa522.1521675563.git.petrm@mellanox.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---

diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index b956868fd4450..863b61478edd6 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -1004,8 +1004,10 @@ 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;