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python: return error if PyObject obj is NULL for unwrapper helper functions

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The result is indeterminate for NULL argument to python
functions as follows. It's better to return negative value in
these situations.

PyObject_IsTrue will segfault if the argument is NULL
PyFloat_AsDouble(NULL) is -1.000000
PyLong_AsUnsignedLongLong(NULL) is 0.000000
This commit is contained in:
Guannan Ren 2012-09-27 01:33:50 +08:00
parent db488c7917
commit 4c6be02a3e
1 changed files with 41 additions and 2 deletions
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43
python/typewrappers.c
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@ -124,6 +124,11 @@ libvirt_intUnwrap(PyObject *obj, int *val)
{
long long_val;
if (!obj) {
PyErr_SetString(PyExc_TypeError, "unexpected type");
return -1;
}
/* If obj is type of PyInt_Type, PyInt_AsLong converts it
* to C long type directly. If it is of PyLong_Type, PyInt_AsLong
* will call PyLong_AsLong() to deal with it automatically.
@ -151,6 +156,11 @@ libvirt_uintUnwrap(PyObject *obj, unsigned int *val)
{
long long_val;
if (!obj) {
PyErr_SetString(PyExc_TypeError, "unexpected type");
return -1;
}
long_val = PyInt_AsLong(obj);
if ((long_val == -1) && PyErr_Occurred())
return -1;
@ -170,6 +180,11 @@ libvirt_longUnwrap(PyObject *obj, long *val)
{
long long_val;
if (!obj) {
PyErr_SetString(PyExc_TypeError, "unexpected type");
return -1;
}
long_val = PyInt_AsLong(obj);
if ((long_val == -1) && PyErr_Occurred())
return -1;
@ -183,6 +198,11 @@ libvirt_ulongUnwrap(PyObject *obj, unsigned long *val)
{
long long_val;
if (!obj) {
PyErr_SetString(PyExc_TypeError, "unexpected type");
return -1;
}
long_val = PyInt_AsLong(obj);
if ((long_val == -1) && PyErr_Occurred())
return -1;
@ -202,6 +222,11 @@ libvirt_longlongUnwrap(PyObject *obj, long long *val)
{
long long llong_val;
if (!obj) {
PyErr_SetString(PyExc_TypeError, "unexpected type");
return -1;
}
/* If obj is of PyInt_Type, PyLong_AsLongLong
* will call PyInt_AsLong() to handle it automatically.
*/
@ -219,6 +244,11 @@ libvirt_ulonglongUnwrap(PyObject *obj, unsigned long long *val)
unsigned long long ullong_val = -1;
long long llong_val;
if (!obj) {
PyErr_SetString(PyExc_TypeError, "unexpected type");
return -1;
}
/* The PyLong_AsUnsignedLongLong doesn't check the type of
* obj, only accept argument of PyLong_Type, so we check it instead.
*/
@ -247,6 +277,11 @@ libvirt_doubleUnwrap(PyObject *obj, double *val)
{
double double_val;
if (!obj) {
PyErr_SetString(PyExc_TypeError, "unexpected type");
return -1;
}
double_val = PyFloat_AsDouble(obj);
if ((double_val == -1) && PyErr_Occurred())
return -1;
@ -260,8 +295,12 @@ libvirt_boolUnwrap(PyObject *obj, bool *val)
{
int ret;
ret = PyObject_IsTrue(obj);
if (ret < 0)
if (!obj) {
PyErr_SetString(PyExc_TypeError, "unexpected type");
return -1;
}
if ((ret = PyObject_IsTrue(obj)) < 0)
return ret;
*val = ret > 0;