bound host copy to its length in php_fopen_do_pasv#22203
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php_fopen_do_pasv at ftp_fopen_wrapper.c:364 copies the host with a fixed ip_size from hoststart, which points into the 512-byte tmp_line holding the server's untrusted 227 reply, so a long message before the address tuple drives the read past the end of the buffer. Copy only the NUL-terminated host length instead, capped to ip_size-1.