1612 static PyObject *
1613 alsamixer_getmute(alsamixer_t *self, PyObject *args) 
1614 {
1615     snd_mixer_elem_t *elem;
1616     int i;
1617     int ival;
1618     PyObject *result;
1619     PyObject *item;
1620 
1621     if (!PyArg_ParseTuple(args,":getmute")) 
when PyArg_ParseTuple() succeeds
taking False path
1622         return NULL;
1623 
1624     if (!self->handle) 
when treating unknown struct snd_mixer_t * from alsaaudio.c:1624 as non-NULL
taking False path
1625     {
1626         PyErr_SetString(ALSAAudioError, "Mixer is closed");
1627         return NULL;
1628     }
1629 
1630     elem = alsamixer_find_elem(self->handle,self->controlname,self->controlid);
1631     if (!snd_mixer_selem_has_playback_switch(elem)) 
when considering range: -0x80000000 <= value <= -1
taking False path
1632     {
1633         PyErr_SetString(ALSAAudioError,"Mixer has no mute switch");
1634         return NULL;
1635     }    
1636 
1637     result = PyList_New(0);
when PyList_New() succeeds
1638 
1639     for (i = 0; i <= SND_MIXER_SCHN_LAST; i++) 
taking True path
1640     {
1641         if (snd_mixer_selem_has_playback_channel(elem, i)) 
when considering range: -0x80000000 <= value <= -1
taking True path
1642         {
1643             snd_mixer_selem_get_playback_switch(elem, i, &ival);
1644 
1645             item = PyLong_FromLong(!ival);
when PyLong_FromLong() fails
1646             PyList_Append(result, item);
returning -1 from PyList_Append() due to NULL item
1647             Py_DECREF(item);
dereferencing NULL (item->ob_refcnt) at alsaaudio.c:1647
found 3 similar trace(s) to this
1648         }
1649     }
1650     return result;
1651 }

1612 static PyObject *
1613 alsamixer_getmute(alsamixer_t *self, PyObject *args) 
1614 {
1615     snd_mixer_elem_t *elem;
1616     int i;
1617     int ival;
1618     PyObject *result;
1619     PyObject *item;
1620 
1621     if (!PyArg_ParseTuple(args,":getmute")) 
when PyArg_ParseTuple() succeeds
taking False path
1622         return NULL;
1623 
1624     if (!self->handle) 
when treating unknown struct snd_mixer_t * from alsaaudio.c:1624 as non-NULL
taking False path
1625     {
1626         PyErr_SetString(ALSAAudioError, "Mixer is closed");
1627         return NULL;
1628     }
1629 
1630     elem = alsamixer_find_elem(self->handle,self->controlname,self->controlid);
1631     if (!snd_mixer_selem_has_playback_switch(elem)) 
when considering range: -0x80000000 <= value <= -1
taking False path
1632     {
1633         PyErr_SetString(ALSAAudioError,"Mixer has no mute switch");
1634         return NULL;
1635     }    
1636 
1637     result = PyList_New(0);
when PyList_New() fails
1638 
1639     for (i = 0; i <= SND_MIXER_SCHN_LAST; i++) 
taking True path
1640     {
1641         if (snd_mixer_selem_has_playback_channel(elem, i)) 
when considering range: -0x80000000 <= value <= -1
taking True path
1642         {
1643             snd_mixer_selem_get_playback_switch(elem, i, &ival);
1644 
1645             item = PyLong_FromLong(!ival);
when PyLong_FromLong() succeeds
1646             PyList_Append(result, item);
calling PyList_Append with NULL as argument 1 (result) at alsaaudio.c:1646
PyList_Append() invokes Py_TYPE() on the pointer via the PyList_Check() macro, thus accessing (NULL)->ob_type
found 7 similar trace(s) to this
1647             Py_DECREF(item);
1648         }
1649     }
1650     return result;
1651 }