Segfault in php_memc_zval_from_payload

[poison]

If for some reason the memcache server has a payload length bigger than 128 bytes, with a flag LONG (1) or DOUBLE (2), we're accessing invalid memory and corrupting the stack (of 128 bytes). While it's unlikely, using append en prepend makes it easy to reproduce.

[mkoppanen]

This has been merged