Description:
------------
Using php-5.3.2 as a cgi executable with Apache on Linux (though this bug looks to exist in the trunk branch as well).

We have an apache RewriteRule that turned the URL requested into another location (that unfortunately does not exist on the file system).

Here is a source change I made to find the error:
Index: sapi/cgi/cgi_main.c                                                      
=================================================================== 
diff -p -u -r1.5 cgi_main.c
--- sapi/cgi/cgi_main.c 16 Apr 2010 19:15:31 -0000  1.5
+++ sapi/cgi/cgi_main.c 28 Apr 2010 20:12:25 -0000
@@ -750,8 +750,10 @@ static void php_cgi_ini_activate_user_co
        zend_hash_clean(entry->user_config);

        if (!IS_ABSOLUTE_PATH(path, path_len)) {
+            fprintf(stderr, "MZ1 2.3, path is %s\n", path);
            real_path = tsrm_realpath(path, NULL TSRMLS_CC);
-           real_path_len = strlen(real_path);
+            fprintf(stderr, "MZ1 2.4, real_path is %s\n", real_path ? real_path : "(MZ nil)");
+           real_path_len = real_path ? strlen(real_path) : 0;
            path = real_path;
            path_len = real_path_len;
        }
========================================================
And here is the resultant error_log info from Apache:
----------------------
[Wed Apr 28 14:13:29 2010] [error] [client 192.168.6.63] MZ1 2.3, path is redirect:/per_site_html_root/mzoellerapache/euf/application/gonow/widgets/standard/navigation/NavigationTab2/logic.js/gonow/widgets/standard/navigation/NavigationTab2/
[Wed Apr 28 14:13:29 2010] [error] [client 192.168.6.63] MZ1 2.4, real_path is (MZ nil)
--------------

The process would fail on the call to strlen(real_path), as real_path was a NULL pointer. This might also be classified as Junk In, Junk Out, as we were passing a messed up path due to the Apache rewrite rule.

It looks like this error was introduced by pajoye with Revision 282336 : https://cvs.php.net/viewvc/php/php-src/branches/PHP_5_3/sapi/cgi/cgi_main.c?r1=282335&r2=282336&