Description:
------------
Weird stuff going on with pack().

pack("A*", $float) makes the process go in to a endless loop (if you turn off memory limit), and kills the apache-thread (and probably server too if it's a slow one), trying to allocate ~1GB memory.

It's important to check all user-inputs to the pack()-function as it might hang the server for a while.

From the PHP-doc: "Also note that PHP internally stores integer values as signed values of a machine dependent size. If you give it an unsigned integer value too large to be stored that way it is converted to a float which often yields an undesired result."

(Including php-version 5.1.1)


Reproduce code:
---------------
<?php
   echo pack( "A*", 1.0 );
?>
FATAL:  emalloc():  Unable to allocate 1072693249 bytes


<?php
   echo strlen( pack( "A*", (int) "heh" ));
   // Returns 3 all though we cast an integer to it?
?>

Expected result:
----------------
A fatal error on emalloc() that's unable to allocate an machine dependent amount of memory.