GraphicsMagick: denial of service

From the Red Hat advisory:

"As this function stands, it invisibly does the wrong thing for any request over 4GB. On big-endian architectures it very possibly will do the wrong thing even for requests less than that. So the reason why the hard-wired 4GB limit prevents a core dump is that it masks the ABI mismatch here."

So basically we have memory allocations problems that can probably lead to a denial of service.