Fix zend_alloc memory extend (realloc with increased size) for Windows

Author: mvorisek

Zend/zend_alloc.c

@@ -415,11 +415,40 @@ stderr_last_error(char *msg)
 /* OS Allocation */
 /*****************/
 
+static void zend_mm_munmap(void *addr, size_t size)
+{
+#ifdef _WIN32
+	if (VirtualFree(addr, 0, MEM_RELEASE) == 0) {
+#if ZEND_MM_ERROR
+		stderr_last_error("VirtualFree() failed");
+#endif
+	}
+#else
+	if (munmap(addr, size) != 0) {
+#if ZEND_MM_ERROR
+		fprintf(stderr, "\nmunmap() failed: [%d] %s\n", errno, strerror(errno));
+#endif
+	}
+#endif
+}
+
 #ifndef HAVE_MREMAP
 static void *zend_mm_mmap_fixed(void *addr, size_t size)
 {
 #ifdef _WIN32
-	return VirtualAlloc(addr, size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
+	void *ptr = VirtualAlloc(addr, size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
+	if (ptr == NULL) {
+        if (GetLastError() == ERROR_INVALID_ADDRESS) {
+            zend_mm_munmap(ptr, size);
+            return NULL;
+        }
+#if ZEND_MM_ERROR
+		stderr_last_error("VirtualAlloc(addr) failed");
+#endif
+		return NULL;
+	}
+    EXPECTED(ptr == addr);
+	return ptr;
 #else
 	int flags = MAP_PRIVATE | MAP_ANON;
 #if defined(MAP_EXCL)
@@ -434,11 +463,7 @@ static void *zend_mm_mmap_fixed(void *addr, size_t size)
 #endif
 		return NULL;
 	} else if (ptr != addr) {
-		if (munmap(ptr, size) != 0) {
-#if ZEND_MM_ERROR
-			fprintf(stderr, "\nmunmap() failed: [%d] %s\n", errno, strerror(errno));
-#endif
-		}
+		zend_mm_munmap(ptr, size);
 		return NULL;
 	}
 	return ptr;
@@ -450,10 +475,9 @@ static void *zend_mm_mmap(size_t size)
 {
 #ifdef _WIN32
 	void *ptr = VirtualAlloc(NULL, size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
-
 	if (ptr == NULL) {
 #if ZEND_MM_ERROR
-		stderr_last_error("VirtualAlloc() failed");
+		stderr_last_error("VirtualAlloc(NULL) failed");
 #endif
 		return NULL;
 	}
@@ -482,23 +506,6 @@ static void *zend_mm_mmap(size_t size)
 #endif
 }
 
-static void zend_mm_munmap(void *addr, size_t size)
-{
-#ifdef _WIN32
-	if (VirtualFree(addr, 0, MEM_RELEASE) == 0) {
-#if ZEND_MM_ERROR
-		stderr_last_error("VirtualFree() failed");
-#endif
-	}
-#else
-	if (munmap(addr, size) != 0) {
-#if ZEND_MM_ERROR
-		fprintf(stderr, "\nmunmap() failed: [%d] %s\n", errno, strerror(errno));
-#endif
-	}
-#endif
-}
-
 /***********/
 /* Bitmask */
 /***********/
@@ -1846,11 +1853,7 @@ static zend_mm_heap *zend_mm_init(void)
 
 	if (UNEXPECTED(chunk == NULL)) {
 #if ZEND_MM_ERROR
-#ifdef _WIN32
-		stderr_last_error("Can't initialize heap");
-#else
-		fprintf(stderr, "\nCan't initialize heap: [%d] %s\n", errno, strerror(errno));
-#endif
+        fprintf(stderr, "\nCan't initialize heap\n");
 #endif
 		return NULL;
 	}
@@ -2978,11 +2981,7 @@ ZEND_API zend_mm_heap *zend_mm_startup_ex(const zend_mm_handlers *handlers, void
 	chunk = (zend_mm_chunk*)handlers->chunk_alloc(&tmp_storage, ZEND_MM_CHUNK_SIZE, ZEND_MM_CHUNK_SIZE);
 	if (UNEXPECTED(chunk == NULL)) {
 #if ZEND_MM_ERROR
-#ifdef _WIN32
-		stderr_last_error("Can't initialize heap");
-#else
-		fprintf(stderr, "\nCan't initialize heap: [%d] %s\n", errno, strerror(errno));
-#endif
+        fprintf(stderr, "\nCan't initialize heap\n");
 #endif
 		return NULL;
 	}
@@ -3025,11 +3024,7 @@ ZEND_API zend_mm_heap *zend_mm_startup_ex(const zend_mm_handlers *handlers, void
 	if (!storage) {
 		handlers->chunk_free(&tmp_storage, chunk, ZEND_MM_CHUNK_SIZE);
 #if ZEND_MM_ERROR
-#ifdef _WIN32
-		stderr_last_error("Can't initialize heap");
-#else
-		fprintf(stderr, "\nCan't initialize heap: [%d] %s\n", errno, strerror(errno));
-#endif
+        fprintf(stderr, "\nCan't initialize heap\n");
 #endif
 		return NULL;
 	}