Issue #23446: Use PyMem_New instead of PyMem_Malloc to avoid possible integer

overflows.  Added few missed PyErr_NoMemory().

12 files changed, 40 insertions, 30 deletions

diff --git a/Modules/_ctypes/_ctypes.c b/Modules/_ctypes/_ctypes.c
index c2889d2..14ec4ce 100644
--- a/Modules/_ctypes/_ctypes.c
+++ b/Modules/_ctypes/_ctypes.c
@@ -4305,8 +4305,11 @@ Array_subscript(PyObject *myself, PyObject *item)
                                               slicelen);
             }
 
-            dest = (wchar_t *)PyMem_Malloc(
-                                    slicelen * sizeof(wchar_t));
+            dest = PyMem_New(wchar_t, slicelen);
+            if (dest == NULL) {
+                PyErr_NoMemory();
+                return NULL;
+            }
 
             for (cur = start, i = 0; i < slicelen;
                  cur += step, i++) {
@@ -4986,7 +4989,7 @@ Pointer_subscript(PyObject *myself, PyObject *item)
                 return PyUnicode_FromWideChar(ptr + start,
                                               len);
             }
-            dest = (wchar_t *)PyMem_Malloc(len * sizeof(wchar_t));
+            dest = PyMem_New(wchar_t, len);
             if (dest == NULL)
                 return PyErr_NoMemory();
             for (cur = start, i = 0; i < len; cur += step, i++) {
diff --git a/Modules/_ctypes/stgdict.c b/Modules/_ctypes/stgdict.c
index 728f751..879afb8 100644
--- a/Modules/_ctypes/stgdict.c
+++ b/Modules/_ctypes/stgdict.c
@@ -76,14 +76,18 @@ PyCStgDict_clone(StgDictObject *dst, StgDictObject *src)
 
     if (src->format) {
         dst->format = PyMem_Malloc(strlen(src->format) + 1);
-        if (dst->format == NULL)
+        if (dst->format == NULL) {
+            PyErr_NoMemory();
             return -1;
+        }
         strcpy(dst->format, src->format);
     }
     if (src->shape) {
         dst->shape = PyMem_Malloc(sizeof(Py_ssize_t) * src->ndim);
-        if (dst->shape == NULL)
+        if (dst->shape == NULL) {
+            PyErr_NoMemory();
             return -1;
+        }
         memcpy(dst->shape, src->shape,
                sizeof(Py_ssize_t) * src->ndim);
     }
@@ -380,7 +384,7 @@ PyCStructUnionType_update_stgdict(PyObject *type, PyObject *fields, int isStruct
         union_size = 0;
         total_align = align ? align : 1;
         stgdict->ffi_type_pointer.type = FFI_TYPE_STRUCT;
-        stgdict->ffi_type_pointer.elements = PyMem_Malloc(sizeof(ffi_type *) * (basedict->length + len + 1));
+        stgdict->ffi_type_pointer.elements = PyMem_New(ffi_type *, basedict->length + len + 1);
         if (stgdict->ffi_type_pointer.elements == NULL) {
             PyErr_NoMemory();
             return -1;
@@ -398,7 +402,7 @@ PyCStructUnionType_update_stgdict(PyObject *type, PyObject *fields, int isStruct
         union_size = 0;
         total_align = 1;
         stgdict->ffi_type_pointer.type = FFI_TYPE_STRUCT;
-        stgdict->ffi_type_pointer.elements = PyMem_Malloc(sizeof(ffi_type *) * (len + 1));
+        stgdict->ffi_type_pointer.elements = PyMem_New(ffi_type *, len + 1);
         if (stgdict->ffi_type_pointer.elements == NULL) {
             PyErr_NoMemory();
             return -1;
diff --git a/Modules/_localemodule.c b/Modules/_localemodule.c
index 400c344..b1d6add 100644
--- a/Modules/_localemodule.c
+++ b/Modules/_localemodule.c
@@ -254,7 +254,7 @@ PyLocale_strxfrm(PyObject* self, PyObject* args)
 
     /* assume no change in size, first */
     n1 = n1 + 1;
-    buf = PyMem_Malloc(n1 * sizeof(wchar_t));
+    buf = PyMem_New(wchar_t, n1);
     if (!buf) {
         PyErr_NoMemory();
         goto exit;
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index 914d5aa..9539710 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -3838,10 +3838,11 @@ static int _setup_ssl_threads(void) {
 
     if (_ssl_locks == NULL) {
         _ssl_locks_count = CRYPTO_num_locks();
-        _ssl_locks = (PyThread_type_lock *)
-            PyMem_Malloc(sizeof(PyThread_type_lock) * _ssl_locks_count);
-        if (_ssl_locks == NULL)
+        _ssl_locks = PyMem_New(PyThread_type_lock, _ssl_locks_count);
+        if (_ssl_locks == NULL) {
+            PyErr_NoMemory();
             return 0;
+        }
         memset(_ssl_locks, 0,
                sizeof(PyThread_type_lock) * _ssl_locks_count);
         for (i = 0;  i < _ssl_locks_count;  i++) {
diff --git a/Modules/_testbuffer.c b/Modules/_testbuffer.c
index 0c6ef16..176df7c 100644
--- a/Modules/_testbuffer.c
+++ b/Modules/_testbuffer.c
@@ -850,7 +850,7 @@ seq_as_ssize_array(PyObject *seq, Py_ssize_t len, int is_shape)
     Py_ssize_t *dest;
     Py_ssize_t x, i;
 
-    dest = PyMem_Malloc(len * (sizeof *dest));
+    dest = PyMem_New(Py_ssize_t, len);
     if (dest == NULL) {
         PyErr_NoMemory();
         return NULL;
diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index 625409e..cf4b0e1 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -1516,7 +1516,7 @@ unicode_aswidechar(PyObject *self, PyObject *args)
 
     if (!PyArg_ParseTuple(args, "Un", &unicode, &buflen))
         return NULL;
-    buffer = PyMem_Malloc(buflen * sizeof(wchar_t));
+    buffer = PyMem_New(wchar_t, buflen);
     if (buffer == NULL)
         return PyErr_NoMemory();
 
diff --git a/Modules/getpath.c b/Modules/getpath.c
index c057737..13e3817 100644
--- a/Modules/getpath.c
+++ b/Modules/getpath.c
@@ -735,7 +735,7 @@ calculate_path(void)
     bufsz += wcslen(zip_path) + 1;
     bufsz += wcslen(exec_prefix) + 1;
 
-    buf = (wchar_t *)PyMem_Malloc(bufsz * sizeof(wchar_t));
+    buf = PyMem_New(wchar_t, bufsz);
     if (buf == NULL) {
         Py_FatalError(
             "Not enough memory for dynamic PYTHONPATH");
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 628dec2..d45f59e 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -1638,7 +1638,7 @@ get_target_path(HANDLE hdl, wchar_t **target_path)
     if(!buf_size)
         return FALSE;
 
-    buf = (wchar_t *)PyMem_Malloc((buf_size+1)*sizeof(wchar_t));
+    buf = PyMem_New(wchar_t, buf_size+1);
     if (!buf) {
         SetLastError(ERROR_OUTOFMEMORY);
         return FALSE;
@@ -3627,7 +3627,7 @@ _listdir_windows_no_opendir(path_t *path, PyObject *list)
             len = wcslen(path->wide);
         }
         /* The +5 is so we can append "\\*.*\0" */
-        wnamebuf = PyMem_Malloc((len + 5) * sizeof(wchar_t));
+        wnamebuf = PyMem_New(wchar_t, len + 5);
         if (!wnamebuf) {
             PyErr_NoMemory();
             goto exit;
@@ -3917,7 +3917,7 @@ posix__getfullpathname(PyObject *self, PyObject *args)
                                   Py_ARRAY_LENGTH(woutbuf),
                                   woutbuf, &wtemp);
         if (result > Py_ARRAY_LENGTH(woutbuf)) {
-            woutbufp = PyMem_Malloc(result * sizeof(wchar_t));
+            woutbufp = PyMem_New(wchar_t, result);
             if (!woutbufp)
                 return PyErr_NoMemory();
             result = GetFullPathNameW(wpath, result, woutbufp, &wtemp);
@@ -3997,7 +3997,7 @@ posix__getfinalpathname(PyObject *self, PyObject *args)
     if(!buf_size)
         return win32_error_object("GetFinalPathNameByHandle", po);
 
-    target_path = (wchar_t *)PyMem_Malloc((buf_size+1)*sizeof(wchar_t));
+    target_path = PyMem_New(wchar_t, buf_size+1);
     if(!target_path)
         return PyErr_NoMemory();
 
@@ -4082,7 +4082,7 @@ posix__getvolumepathname(PyObject *self, PyObject *args)
         return NULL;
     }
 
-    mountpath = (wchar_t *)PyMem_Malloc(buflen * sizeof(wchar_t));
+    mountpath = PyMem_New(wchar_t, buflen);
     if (mountpath == NULL)
         return PyErr_NoMemory();
 
@@ -6213,9 +6213,9 @@ posix_getgrouplist(PyObject *self, PyObject *args)
 #endif
 
 #ifdef __APPLE__
-    groups = PyMem_Malloc(ngroups * sizeof(int));
+    groups = PyMem_New(int, ngroups);
 #else
-    groups = PyMem_Malloc(ngroups * sizeof(gid_t));
+    groups = PyMem_New(gid_t, ngroups);
 #endif
     if (groups == NULL)
         return PyErr_NoMemory();
@@ -6293,7 +6293,7 @@ posix_getgroups(PyObject *self, PyObject *noargs)
         /* groups will fit in existing array */
         alt_grouplist = grouplist;
     } else {
-        alt_grouplist = PyMem_Malloc(n * sizeof(gid_t));
+        alt_grouplist = PyMem_New(gid_t, n);
         if (alt_grouplist == NULL) {
             errno = EINVAL;
             return posix_error();
@@ -6319,7 +6319,7 @@ posix_getgroups(PyObject *self, PyObject *noargs)
                 /* Avoid malloc(0) */
                 alt_grouplist = grouplist;
             } else {
-                alt_grouplist = PyMem_Malloc(n * sizeof(gid_t));
+                alt_grouplist = PyMem_New(gid_t, n);
                 if (alt_grouplist == NULL) {
                     errno = EINVAL;
                     return posix_error();
diff --git a/Modules/pyexpat.c b/Modules/pyexpat.c
index 4ced53b..19be0c7 100644
--- a/Modules/pyexpat.c
+++ b/Modules/pyexpat.c
@@ -928,7 +928,7 @@ xmlparse_ExternalEntityParserCreate(xmlparseobject *self, PyObject *args)
     for (i = 0; handler_info[i].name != NULL; i++)
         /* do nothing */;
 
-    new_parser->handlers = PyMem_Malloc(sizeof(PyObject *) * i);
+    new_parser->handlers = PyMem_New(PyObject *, i);
     if (!new_parser->handlers) {
         Py_DECREF(new_parser);
         return PyErr_NoMemory();
@@ -1121,7 +1121,7 @@ newxmlparseobject(char *encoding, char *namespace_separator, PyObject *intern)
     for (i = 0; handler_info[i].name != NULL; i++)
         /* do nothing */;
 
-    self->handlers = PyMem_Malloc(sizeof(PyObject *) * i);
+    self->handlers = PyMem_New(PyObject *, i);
     if (!self->handlers) {
         Py_DECREF(self);
         return PyErr_NoMemory();
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index cb44d05..e9feba3 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -4126,9 +4126,11 @@ socket_gethostname(PyObject *self, PyObject *unused)
 
     /* MSDN says ERROR_MORE_DATA may occur because DNS allows longer
        names */
-    name = PyMem_Malloc(size * sizeof(wchar_t));
-    if (!name)
+    name = PyMem_New(wchar_t, size);
+    if (!name) {
+        PyErr_NoMemory();
         return NULL;
+    }
     if (!GetComputerNameExW(ComputerNamePhysicalDnsHostname,
                            name,
                            &size))
diff --git a/Modules/unicodedata.c b/Modules/unicodedata.c
index ec70e7a..47d2937 100644
--- a/Modules/unicodedata.c
+++ b/Modules/unicodedata.c
@@ -556,7 +556,7 @@ nfd_nfkd(PyObject *self, PyObject *input, int k)
     /* Overallocate at most 10 characters. */
     space = (isize > 10 ? 10 : isize) + isize;
     osize = space;
-    output = PyMem_Malloc(space * sizeof(Py_UCS4));
+    output = PyMem_New(Py_UCS4, space);
     if (!output) {
         PyErr_NoMemory();
         return NULL;
@@ -703,7 +703,7 @@ nfc_nfkc(PyObject *self, PyObject *input, int k)
     /* We allocate a buffer for the output.
        If we find that we made no changes, we still return
        the NFD result. */
-    output = PyMem_Malloc(len * sizeof(Py_UCS4));
+    output = PyMem_New(Py_UCS4, len);
     if (!output) {
         PyErr_NoMemory();
         Py_DECREF(result);
diff --git a/Modules/zipimport.c b/Modules/zipimport.c
index 8fe9195..f2cc245 100644
--- a/Modules/zipimport.c
+++ b/Modules/zipimport.c
@@ -233,7 +233,7 @@ make_filename(PyObject *prefix, PyObject *name)
     Py_ssize_t len;
 
     len = PyUnicode_GET_LENGTH(prefix) + PyUnicode_GET_LENGTH(name) + 1;
-    p = buf = PyMem_Malloc(sizeof(Py_UCS4) * len);
+    p = buf = PyMem_New(Py_UCS4, len);
     if (buf == NULL) {
         PyErr_NoMemory();
         return NULL;