Fix argument checking errors in _speedups.c.

Always check PyObject_IsTrue() for error.
Also fix integer overflow in the int_as_string_bitcount argument.

Fixes #167.

1 files changed, 69 insertions, 34 deletions

diff --git a/simplejson/_speedups.c b/simplejson/_speedups.c
index 212616a..291f56e 100644
--- a/simplejson/_speedups.c
+++ b/simplejson/_speedups.c
@@ -1440,10 +1440,12 @@ _parse_object_str(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_
     PyObject *key = NULL;
     PyObject *val = NULL;
     char *encoding = JSON_ASCII_AS_STRING(s->encoding);
-    int strict = PyObject_IsTrue(s->strict);
     int has_pairs_hook = (s->pairs_hook != Py_None);
     int did_parse = 0;
     Py_ssize_t next_idx;
+    int strict = PyObject_IsTrue(s->strict);
+    if (strict < 0)
+        return NULL;
     if (has_pairs_hook) {
         pairs = PyList_New(0);
         if (pairs == NULL)
@@ -1601,11 +1603,13 @@ _parse_object_unicode(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ss
     PyObject *item;
     PyObject *key = NULL;
     PyObject *val = NULL;
-    int strict = PyObject_IsTrue(s->strict);
     int has_pairs_hook = (s->pairs_hook != Py_None);
     int did_parse = 0;
     Py_ssize_t next_idx;
+    int strict = PyObject_IsTrue(s->strict);
 
+    if (strict < 0)
+        return NULL;
     if (has_pairs_hook) {
         pairs = PyList_New(0);
         if (pairs == NULL)
@@ -2167,6 +2171,7 @@ scan_once_str(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *n
     Py_ssize_t length = PyString_GET_SIZE(pystr);
     PyObject *rval = NULL;
     int fallthrough = 0;
+    int strict;
     if (idx < 0 || idx >= length) {
         raise_errmsg(ERR_EXPECTING_VALUE, pystr, idx);
         return NULL;
@@ -2174,9 +2179,12 @@ scan_once_str(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *n
     switch (str[idx]) {
         case '"':
             /* string */
+            strict = PyObject_IsTrue(s->strict)
+            if (strict < 0)
+                return NULL;
             rval = scanstring_str(pystr, idx + 1,
                 JSON_ASCII_AS_STRING(s->encoding),
-                PyObject_IsTrue(s->strict),
+                strict,
                 next_idx_ptr);
             break;
         case '{':
@@ -2275,6 +2283,7 @@ scan_once_unicode(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_
     Py_ssize_t length = PyUnicode_GetLength(pystr);
     PyObject *rval = NULL;
     int fallthrough = 0;
+    int strict;
     if (idx < 0 || idx >= length) {
         raise_errmsg(ERR_EXPECTING_VALUE, pystr, idx);
         return NULL;
@@ -2282,8 +2291,11 @@ scan_once_unicode(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_
     switch (PyUnicode_READ(kind, str, idx)) {
         case '"':
             /* string */
+            strict = PyObject_IsTrue(s->strict);
+            if (strict < 0)
+                return NULL;
             rval = scanstring_unicode(pystr, idx + 1,
-                PyObject_IsTrue(s->strict),
+                strict,
                 next_idx_ptr);
             break;
         case '{':
@@ -2577,6 +2589,7 @@ encoder_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
     PyObject *use_decimal, *namedtuple_as_object, *tuple_as_array, *iterable_as_array;
     PyObject *int_as_string_bitcount, *item_sort_key, *encoding, *for_json;
     PyObject *ignore_nan, *Decimal;
+    int is_true;
 
     if (!PyArg_ParseTupleAndKeywords(args, kwds, "OOOOOOOOOOOOOOOOOOOO:make_encoder", kwlist,
         &markers, &defaultfn, &encoder, &indent, &key_separator, &item_separator,
@@ -2608,29 +2621,44 @@ encoder_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
     Py_INCREF(skipkeys);
     s->skipkeys_bool = skipkeys;
     s->skipkeys = PyObject_IsTrue(skipkeys);
+    if (s->skipkeys < 0)
+        goto bail;
     Py_INCREF(key_memo);
     s->key_memo = key_memo;
     s->fast_encode = (PyCFunction_Check(s->encoder) && PyCFunction_GetFunction(s->encoder) == (PyCFunction)py_encode_basestring_ascii);
-    s->allow_or_ignore_nan = (
-        (PyObject_IsTrue(ignore_nan) ? JSON_IGNORE_NAN : 0) |
-        (PyObject_IsTrue(allow_nan) ? JSON_ALLOW_NAN : 0));
+    is_true = PyObject_IsTrue(ignore_nan);
+    if (is_true < 0)
+        goto bail;
+    s->allow_or_ignore_nan = is_true ? JSON_IGNORE_NAN : 0;
+    is_true = PyObject_IsTrue(allow_nan);
+    if (is_true < 0)
+        goto bail;
+    s->allow_or_ignore_nan |= is_true ? JSON_ALLOW_NAN : 0;
     s->use_decimal = PyObject_IsTrue(use_decimal);
+    if (s->use_decimal < 0)
+        goto bail;
     s->namedtuple_as_object = PyObject_IsTrue(namedtuple_as_object);
+    if (s->namedtuple_as_object < 0)
+        goto bail;
     s->tuple_as_array = PyObject_IsTrue(tuple_as_array);
+    if (s->tuple_as_array < 0)
+        goto bail;
     s->iterable_as_array = PyObject_IsTrue(iterable_as_array);
+    if (s->iterable_as_array < 0)
+        goto bail;
     if (PyInt_Check(int_as_string_bitcount) || PyLong_Check(int_as_string_bitcount)) {
-        static const unsigned int long_long_bitsize = SIZEOF_LONG_LONG * 8;
-        int int_as_string_bitcount_val = (int)PyLong_AsLong(int_as_string_bitcount);
-        if (int_as_string_bitcount_val > 0 && int_as_string_bitcount_val < (int)long_long_bitsize) {
-            s->max_long_size = PyLong_FromUnsignedLongLong(1ULL << int_as_string_bitcount_val);
-            s->min_long_size = PyLong_FromLongLong(-1LL << int_as_string_bitcount_val);
+        static const unsigned long long_long_bitsize = SIZEOF_LONG_LONG * 8;
+        long int_as_string_bitcount_val = PyLong_AsLong(int_as_string_bitcount);
+        if (int_as_string_bitcount_val > 0 && int_as_string_bitcount_val < (long)long_long_bitsize) {
+            s->max_long_size = PyLong_FromUnsignedLongLong(1ULL << (int)int_as_string_bitcount_val);
+            s->min_long_size = PyLong_FromLongLong(-1LL << (int)int_as_string_bitcount_val);
             if (s->min_long_size == NULL || s->max_long_size == NULL) {
                 goto bail;
             }
         }
         else {
             PyErr_Format(PyExc_TypeError,
-                         "int_as_string_bitcount (%d) must be greater than 0 and less than the number of bits of a `long long` type (%u bits)",
+                         "int_as_string_bitcount (%ld) must be greater than 0 and less than the number of bits of a `long long` type (%lu bits)",
                          int_as_string_bitcount_val, long_long_bitsize);
             goto bail;
         }
@@ -2651,29 +2679,34 @@ encoder_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
             goto bail;
         }
     }
-    else if (PyObject_IsTrue(sort_keys)) {
-        static PyObject *itemgetter0 = NULL;
-        if (!itemgetter0) {
-            PyObject *operator = PyImport_ImportModule("operator");
-            if (!operator)
-                goto bail;
-            itemgetter0 = PyObject_CallMethod(operator, "itemgetter", "i", 0);
-            Py_DECREF(operator);
-        }
-        item_sort_key = itemgetter0;
-        if (!item_sort_key)
-            goto bail;
-    }
-    if (item_sort_key == Py_None) {
-        Py_INCREF(Py_None);
-        s->item_sort_kw = Py_None;
-    }
     else {
-        s->item_sort_kw = PyDict_New();
-        if (s->item_sort_kw == NULL)
-            goto bail;
-        if (PyDict_SetItemString(s->item_sort_kw, "key", item_sort_key))
+        is_true = PyObject_IsTrue(sort_keys);
+        if (is_true < 0)
             goto bail;
+        if (is_true) {
+            static PyObject *itemgetter0 = NULL;
+            if (!itemgetter0) {
+                PyObject *operator = PyImport_ImportModule("operator");
+                if (!operator)
+                    goto bail;
+                itemgetter0 = PyObject_CallMethod(operator, "itemgetter", "i", 0);
+                Py_DECREF(operator);
+            }
+            item_sort_key = itemgetter0;
+            if (!item_sort_key)
+                goto bail;
+        }
+        if (item_sort_key == Py_None) {
+            Py_INCREF(Py_None);
+            s->item_sort_kw = Py_None;
+        }
+        else {
+            s->item_sort_kw = PyDict_New();
+            if (s->item_sort_kw == NULL)
+                goto bail;
+            if (PyDict_SetItemString(s->item_sort_kw, "key", item_sort_key))
+                goto bail;
+        }
     }
     Py_INCREF(sort_keys);
     s->sort_keys = sort_keys;
@@ -2682,6 +2715,8 @@ encoder_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
     Py_INCREF(Decimal);
     s->Decimal = Decimal;
     s->for_json = PyObject_IsTrue(for_json);
+    if (s->for_json < 0)
+        goto bail;
 
     return (PyObject *)s;