python: improve conversion validation

Laszlo Ersek pointed out that in trying to convert a long to an
unsigned int, we used:

long long_val = ...;
if ((unsigned int)long_val == long_val)

According to C99 integer promotion rules, the if statement is
equivalent to:

(unsigned long)(unsigned int)long_val == (unsigned long)long_val

since you get an unsigned comparison if at least one side is
unsigned, using the largest rank of the two sides; but on 32-bit
platforms, where unsigned long and unsigned int are the same size,
this comparison is always true and ends up converting negative
long_val into posigive unsigned int values, rather than rejecting
the negative value as we had originally intended (python longs
are unbounded size, and we don't want to do silent modulo
arithmetic when converting to C code).

Fix this by using direct comparisons, rather than casting.

* python/typewrappers.c (libvirt_intUnwrap, libvirt_uintUnwrap)
(libvirt_ulongUnwrap, libvirt_ulonglongUnwrap): Fix conversion
checks.

python/typewrappers.c

@@ -132,7 +132,7 @@ libvirt_intUnwrap(PyObject *obj, int *val)
     if ((long_val == -1) && PyErr_Occurred())
         return -1;
 
-    if ((int)long_val == long_val) {
+    if (long_val >= INT_MIN && long_val <= INT_MAX) {
         *val = long_val;
     } else {
         PyErr_SetString(PyExc_OverflowError,
@@ -151,7 +151,7 @@ libvirt_uintUnwrap(PyObject *obj, unsigned int *val)
     if ((long_val == -1) && PyErr_Occurred())
         return -1;
 
-    if ((unsigned int)long_val == long_val) {
+    if (long_val >= 0 && long_val <= UINT_MAX) {
         *val = long_val;
     } else {
         PyErr_SetString(PyExc_OverflowError,
@@ -183,7 +183,13 @@ libvirt_ulongUnwrap(PyObject *obj, unsigned long *val)
     if ((long_val == -1) && PyErr_Occurred())
         return -1;
 
-    *val = long_val;
+    if (long_val >= 0) {
+        *val = long_val;
+    } else {
+        PyErr_SetString(PyExc_OverflowError,
+                        "negative Python int cannot be converted to C unsigned long");
+        return -1;
+    }
     return 0;
 }
 
@@ -207,16 +213,23 @@ int
 libvirt_ulonglongUnwrap(PyObject *obj, unsigned long long *val)
 {
     unsigned long long ullong_val = -1;
+    long long llong_val;
 
     /* The PyLong_AsUnsignedLongLong doesn't check the type of
      * obj, only accept argument of PyLong_Type, so we check it instead.
      */
-    if (PyInt_Check(obj))
-        ullong_val = PyInt_AsLong(obj);
-    else if (PyLong_Check(obj))
+    if (PyInt_Check(obj)) {
+        llong_val = PyInt_AsLong(obj);
+        if (llong_val < 0)
+            PyErr_SetString(PyExc_OverflowError,
+                            "negative Python int cannot be converted to C unsigned long long");
+        else
+            ullong_val = llong_val;
+    } else if (PyLong_Check(obj)) {
         ullong_val = PyLong_AsUnsignedLongLong(obj);
-    else
+    } else {
         PyErr_SetString(PyExc_TypeError, "an integer is required");
+    }
 
     if ((ullong_val == -1) && PyErr_Occurred())
         return -1;