Issue #18203: Replace malloc() with PyMem_RawMalloc() at Python initialization

* Replace malloc() with PyMem_RawMalloc()
* Replace PyMem_Malloc() with PyMem_RawMalloc() where the GIL is not held.
* _Py_char2wchar() now returns a buffer allocated by PyMem_RawMalloc(), instead
  of PyMem_Malloc()

1 files changed, 18 insertions, 21 deletions

diff --git a/PC/getpathp.c b/PC/getpathp.c
index 308eb87ed6..deb40e76f3 100644
--- a/PC/getpathp.c
+++ b/PC/getpathp.c
@@ -245,9 +245,9 @@ getpythonregpath(HKEY keyBase, int skipcore)
     /* Tried to use sysget("winver") but here is too early :-( */
     versionLen = strlen(PyWin_DLLVersionString);
     /* Space for all the chars, plus one \0 */
-    keyBuf = keyBufPtr = malloc(sizeof(keyPrefix) +
-                                sizeof(WCHAR)*(versionLen-1) +
-                                sizeof(keySuffix));
+    keyBuf = keyBufPtr = PyMem_RawMalloc(sizeof(keyPrefix) +
+                                         sizeof(WCHAR)*(versionLen-1) +
+                                         sizeof(keySuffix));
     if (keyBuf==NULL) goto done;
 
     memcpy(keyBufPtr, keyPrefix, sizeof(keyPrefix)-sizeof(WCHAR));
@@ -271,7 +271,7 @@ getpythonregpath(HKEY keyBase, int skipcore)
     /* Allocate a temp array of char buffers, so we only need to loop
        reading the registry once
     */
-    ppPaths = malloc( sizeof(WCHAR *) * numKeys );
+    ppPaths = PyMem_RawMalloc( sizeof(WCHAR *) * numKeys );
     if (ppPaths==NULL) goto done;
     memset(ppPaths, 0, sizeof(WCHAR *) * numKeys);
     /* Loop over all subkeys, allocating a temp sub-buffer. */
@@ -293,7 +293,7 @@ getpythonregpath(HKEY keyBase, int skipcore)
         /* Find the value of the buffer size, malloc, then read it */
         RegQueryValueExW(subKey, NULL, 0, NULL, NULL, &reqdSize);
         if (reqdSize) {
-            ppPaths[index] = malloc(reqdSize);
+            ppPaths[index] = PyMem_RawMalloc(reqdSize);
             if (ppPaths[index]) {
                 RegQueryValueExW(subKey, NULL, 0, NULL,
                                 (LPBYTE)ppPaths[index],
@@ -308,7 +308,7 @@ getpythonregpath(HKEY keyBase, int skipcore)
     if (dataSize == 0) goto done;
 
     /* original datasize from RegQueryInfo doesn't include the \0 */
-    dataBuf = malloc((dataSize+1) * sizeof(WCHAR));
+    dataBuf = PyMem_RawMalloc((dataSize+1) * sizeof(WCHAR));
     if (dataBuf) {
         WCHAR *szCur = dataBuf;
         DWORD reqdSize = dataSize;
@@ -346,14 +346,13 @@ getpythonregpath(HKEY keyBase, int skipcore)
 done:
     /* Loop freeing my temp buffers */
     if (ppPaths) {
-        for(index=0;index<numKeys;index++)
-            if (ppPaths[index]) free(ppPaths[index]);
-        free(ppPaths);
+        for(index=0; index<numKeys; index++)
+            PyMem_RawFree(ppPaths[index]);
+        PyMem_RawFree(ppPaths);
     }
     if (newKey)
         RegCloseKey(newKey);
-    if (keyBuf)
-        free(keyBuf);
+    PyMem_RawFree(keyBuf);
     return retval;
 }
 #endif /* Py_ENABLE_SHARED */
@@ -616,7 +615,7 @@ calculate_path(void)
     if (envpath != NULL)
         bufsz += wcslen(envpath) + 1;
 
-    module_search_path = buf = malloc(bufsz*sizeof(wchar_t));
+    module_search_path = buf = PyMem_RawMalloc(bufsz*sizeof(wchar_t));
     if (buf == NULL) {
         /* We can't exit, so print a warning and limp along */
         fprintf(stderr, "Can't malloc dynamic PYTHONPATH.\n");
@@ -629,10 +628,8 @@ calculate_path(void)
             module_search_path = PYTHONPATH;
         }
 #ifdef MS_WINDOWS
-        if (machinepath)
-            free(machinepath);
-        if (userpath)
-            free(userpath);
+        PyMem_RawFree(machinepath);
+        PyMem_RawFree(userpath);
 #endif /* MS_WINDOWS */
         return;
     }
@@ -652,13 +649,13 @@ calculate_path(void)
         wcscpy(buf, userpath);
         buf = wcschr(buf, L'\0');
         *buf++ = DELIM;
-        free(userpath);
+        PyMem_RawFree(userpath);
     }
     if (machinepath) {
         wcscpy(buf, machinepath);
         buf = wcschr(buf, L'\0');
         *buf++ = DELIM;
-        free(machinepath);
+        PyMem_RawFree(machinepath);
     }
     if (pythonhome == NULL) {
         if (!skipdefault) {
@@ -745,7 +742,7 @@ void
 Py_SetPath(const wchar_t *path)
 {
     if (module_search_path != NULL) {
-        free(module_search_path);
+        PyMem_RawFree(module_search_path);
         module_search_path = NULL;
     }
     if (path != NULL) {
@@ -753,10 +750,10 @@ Py_SetPath(const wchar_t *path)
         wchar_t *prog = Py_GetProgramName();
         wcsncpy(progpath, prog, MAXPATHLEN);
         prefix[0] = L'\0';
-        module_search_path = malloc((wcslen(path) + 1) * sizeof(wchar_t));
+        module_search_path = PyMem_RawMalloc((wcslen(path) + 1) * sizeof(wchar_t));
         if (module_search_path != NULL)
             wcscpy(module_search_path, path);
-	}
+    }
 }
 
 wchar_t *