Fix some MSAN complaints under Clang (#8553)

Zend/zend_stream.c

@@ -39,7 +39,7 @@ static void zend_stream_stdio_closer(void *handle) /* {{{ */
 
 static size_t zend_stream_stdio_fsizer(void *handle) /* {{{ */
 {
-	zend_stat_t buf;
+	zend_stat_t buf = {0};
 	if (handle && zend_fstat(fileno((FILE*)handle), &buf) == 0) {
 #ifdef S_ISREG
 		if (!S_ISREG(buf.st_mode)) {

Zend/zend_virtual_cwd.c

@@ -502,7 +502,7 @@ static size_t tsrm_realpath_r(char *path, size_t start, size_t len, int *ll, tim
 	do { free(pathw); } while(0);
 
 #else
-	zend_stat_t st;
+	zend_stat_t st = {0};
 #endif
 	realpath_cache_bucket *bucket;
 	char *tmp;

ext/opcache/ZendAccelerator.c

@@ -994,7 +994,7 @@ static accel_time_t zend_get_file_handle_timestamp_win(zend_file_handle *file_ha
 
 accel_time_t zend_get_file_handle_timestamp(zend_file_handle *file_handle, size_t *size)
 {
-	zend_stat_t statbuf;
+	zend_stat_t statbuf = {0};
 #ifdef ZEND_WIN32
 	accel_time_t res;
 #endif

ext/opcache/zend_accelerator_module.c

@@ -134,7 +134,7 @@ static ZEND_INI_MH(OnUpdateFileCache)
 		if (!ZSTR_LEN(new_value)) {
 			new_value = NULL;
 		} else {
-			zend_stat_t buf;
+			zend_stat_t buf = {0};
 
 		    if (!IS_ABSOLUTE_PATH(ZSTR_VAL(new_value), ZSTR_LEN(new_value)) ||
 			    zend_stat(ZSTR_VAL(new_value), &buf) != 0 ||

ext/standard/dir.c

@@ -505,7 +505,7 @@ no_results:
 		 * able to filter directories out.
 		 */
 		if (flags & GLOB_ONLYDIR) {
-			zend_stat_t s;
+			zend_stat_t s = {0};
 
 			if (0 != VCWD_STAT(globbuf.gl_pathv[n], &s)) {
 				continue;

ext/standard/dns.c

@@ -384,7 +384,7 @@ static void _php_dns_free_res(struct __res_state *res) { /* {{{ */
 PHP_FUNCTION(dns_check_record)
 {
 	HEADER *hp;
-	querybuf answer;
+	querybuf answer = {0};
 	char *hostname;
 	size_t hostname_len;
 	zend_string *rectype = NULL;
@@ -470,7 +470,7 @@ static u_char *php_parserr(u_char *cp, u_char *end, querybuf *answer, int type_t
 	long n, i;
 	u_short s;
 	u_char *tp, *p;
-	char name[MAXHOSTNAMELEN];
+	char name[MAXHOSTNAMELEN] = {0};
 	int have_v6_break = 0, in_v6_break = 0;
 
 	ZVAL_UNDEF(subarray);
@@ -839,7 +839,7 @@ PHP_FUNCTION(dns_get_record)
 	struct __res_state *handle = &state;
 #endif
 	HEADER *hp;
-	querybuf answer;
+	querybuf answer = {0};
 	u_char *cp = NULL, *end = NULL;
 	int n, qd, an, ns = 0, ar = 0;
 	int type, first_query = 1, store_results = 1;
@@ -1069,8 +1069,8 @@ PHP_FUNCTION(dns_get_mx)
 	zval *mx_list, *weight_list = NULL;
 	int count, qdc;
 	u_short type, weight;
-	querybuf answer;
-	char buf[MAXHOSTNAMELEN];
+	querybuf answer = {0};
+	char buf[MAXHOSTNAMELEN] = {0};
 	HEADER *hp;
 	u_char *cp, *end;
 	int i;

ext/standard/filestat.c

@@ -740,8 +740,8 @@ PHP_FUNCTION(clearstatcache)
 /* {{{ php_stat */
 PHPAPI void php_stat(zend_string *filename, int type, zval *return_value)
 {
-	zend_stat_t *stat_sb;
-	php_stream_statbuf ssb;
+	zend_stat_t *stat_sb = {0};
+	php_stream_statbuf ssb = {0};
 	int flags = 0, rmask=S_IROTH, wmask=S_IWOTH, xmask=S_IXOTH; /* access rights defaults to other */
 	const char *local = NULL;
 	php_stream_wrapper *wrapper = NULL;

ext/standard/iptc.c

@@ -178,7 +178,7 @@ PHP_FUNCTION(iptcembed)
 	size_t inx;
 	zend_string *spoolbuf = NULL;
 	unsigned char *poi = NULL;
-	zend_stat_t sb;
+	zend_stat_t sb = {0};
 	bool written = 0;
 
 	ZEND_PARSE_PARAMETERS_START(2, 3)

ext/standard/link.c

@@ -94,7 +94,7 @@ PHP_FUNCTION(linkinfo)
 	char *link;
 	char *dirname;
 	size_t link_len;
-	zend_stat_t sb;
+	zend_stat_t sb = {0};
 	int ret;
 
 	ZEND_PARSE_PARAMETERS_START(1, 1)

main/php_ini.c

@@ -566,7 +566,7 @@ int php_init_config(void)
 
 		/* Check if php_ini_file_name is a file and can be opened */
 		if (php_ini_file_name && php_ini_file_name[0]) {
-			zend_stat_t statbuf;
+			zend_stat_t statbuf = {0};
 
 			if (!VCWD_STAT(php_ini_file_name, &statbuf)) {
 				if (!((statbuf.st_mode & S_IFMT) == S_IFDIR)) {
@@ -642,7 +642,7 @@ int php_init_config(void)
 	if (!sapi_module.php_ini_ignore && php_ini_scanned_path_len) {
 		struct dirent **namelist;
 		int ndir, i;
-		zend_stat_t sb;
+		zend_stat_t sb = {0};
 		char ini_file[MAXPATHLEN];
 		char *p;
 		zend_llist scanned_ini_list;