emalloc() troubles

Hi there, I'm trying to hack mail.c to automatically pass a -f argument to qmail with a return address, so that the Return-path of the message is not always root@blah. Anyway, I seem to have been successful in this endeavor, but I have a slight problem - whenever my code gets executed, I get two errors output: /home/ari/php-4.3.0RC4/ext/standard/mail.c(235) : Freeing 0x088F6524 (51 bytes), script=/home/ari/public_html/mail.php /home/ari/php-4.3.0RC4/ext/standard/mail.c(229) : Freeing 0x088F647C (23 bytes), script=/home/ari/public_html/mail.php Line 229 and 235 are the following, respectively: qmail_from = emalloc(strlen(temp) + 3); sendmail_cmd = emalloc(strlen(sendmail_path) + strlen(qmail_from) + 2); I efree() both temp and qmail_from when they're done being used, but I can't seem to find why exactly this message is popping up. Both temp and qmail_from seem to be valid strings, and those are the only two strings I create myself that are used. Any ideas? What else could cause the Freeing error message?