[PATCH 2 of 2] parsers: check results of PyInt_FromLong (issue4771)

[Bryan O'Sullivan]

# HG changeset patch
# User Bryan O'Sullivan <bos at serpentine.com>
# Date 1449979904 28800
#      Sat Dec 12 20:11:44 2015 -0800
# Node ID 7d1b0fa50a8f1f856104aa7afd60f54b736ae170
# Parent  6c0dd7cd82797705c5be51be892afd94a4909a65
parsers: check results of PyInt_FromLong (issue4771)

diff --git a/mercurial/parsers.c b/mercurial/parsers.c
--- a/mercurial/parsers.c
+++ b/mercurial/parsers.c
@@ -1272,6 +1272,7 @@ static PyObject *compute_phases_map_sets
 	PyObject *phaseset = NULL;
 	PyObject *phasessetlist = NULL;
 	PyObject *rev = NULL;
+	PyObject *phaseval;
 	Py_ssize_t len = index_length(self) - 1;
 	Py_ssize_t numphase = 0;
 	Py_ssize_t minrevallphases = 0;
@@ -1332,10 +1333,15 @@ static PyObject *compute_phases_map_sets
 		if (phase != 0) {
 			phaseset = PyList_GET_ITEM(phasessetlist, phase);
 			rev = PyInt_FromLong(i);
+			if (rev == NULL)
+				goto release;
 			PySet_Add(phaseset, rev);
 			Py_XDECREF(rev);
 		}
-		PyList_SET_ITEM(phaseslist, i, PyInt_FromLong(phase));
+		phaseval = PyInt_FromLong(phase);
+		if (phaseval == NULL)
+			goto release;
+		PyList_SET_ITEM(phaseslist, i, phaseval);
 	}
 	ret = PyList_New(2);
 	if (ret == NULL)