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[Bug 509531] CVE-2009-2295 ocaml-camlimages: PNG reader multiple integer overflows (oCERT-2009-009)

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--- Comment #4 from Richard W.M. Jones <rjones redhat com>  2009-07-03 09:31:00 EDT ---
Created an attachment (id=350433)
 --> (https://bugzilla.redhat.com/attachment.cgi?id=350433)

This is a potential fix which checks whether the
numbers we are about to multiply together could
provoke an arithmetic overflow (or are negative,
which would be equally bogus).

It solves the test case that I was given privately.

Note that in any case the bug only manifests on 32 bit
architectures.  On 64 bit, the multiply does not
overflow, but unless you have loads of free memory
you will shortly afterwards get a (safe) Out_of_memory

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