MFB: fix #37395 (recursive mkdir() fails to create nonexistent directories in root...

diff --git a/main/streams/plain_wrapper.c b/main/streams/plain_wrapper.c
index adfb9b4bf1a322d09aceecd3a3a98f1f7f4cb07c..710bb863decdd6f637092c66a52960112c050f71 100644 (file)
--- a/main/streams/plain_wrapper.c
+++ b/main/streams/plain_wrapper.c
@@ -1081,7 +1081,7 @@ static int php_plain_files_mkdir(php_stream_wrapper *wrapper, char *dir, int mod
                }
                else {
                        /* find a top level directory we need to create */
-                       while ( (p = strrchr(buf + offset, DEFAULT_SLASH)) || (p = strrchr(buf, DEFAULT_SLASH)) ) {
+                       while ( (p = strrchr(buf + offset, DEFAULT_SLASH)) || (offset != 1 && (p = strrchr(buf, DEFAULT_SLASH))) ) {
                                *p = '\0';
                                if (VCWD_STAT(buf, &sb) == 0) {
                                        *p = DEFAULT_SLASH;