Fixed bug #61645 (fopen and O_NONBLOCK)

if a mode like "rn" was passed to fopen(), then
php_stream_parse_fopen_modes() would assign O_WRONLY to
flags, because O_NONBLOCK tainted flags for the r/w/+ check

NEWS

@@ -4,6 +4,7 @@ PHP                                                                        NEWS
 
 - Core:
   . Added validation of class names in the autoload process. (Dmitry)
+  . Fixed bug #61645 (fopen and O_NONBLOCK). (Mike)
 
 - Date:
   . Fixed bug #66060 (Heap buffer over-read in DateInterval). (Remi)

main/streams/plain_wrapper.c

@@ -78,11 +78,7 @@ PHPAPI int php_stream_parse_fopen_modes(const char *mode, int *open_flags)
 			/* unknown mode */
 			return FAILURE;
 	}
-#if defined(O_NONBLOCK)
-	if (strchr(mode, 'n')) {
-		flags |= O_NONBLOCK;
-	}
-#endif
+
 	if (strchr(mode, '+')) {
 		flags |= O_RDWR;
 	} else if (flags) {
@@ -91,6 +87,12 @@ PHPAPI int php_stream_parse_fopen_modes(const char *mode, int *open_flags)
 		flags |= O_RDONLY;
 	}
 
+#if defined(O_NONBLOCK)
+	if (strchr(mode, 'n')) {
+		flags |= O_NONBLOCK;
+	}
+#endif
+
 #if defined(_O_TEXT) && defined(O_BINARY)
 	if (strchr(mode, 't')) {
 		flags |= _O_TEXT;