[Bug binutils/24829] readelf: multi interger overflow in readelf.c and dwarf.c

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24829

Alan Modra <amodra at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |amodra at gmail dot com

--- Comment #10 from Alan Modra <amodra at gmail dot com> ---
> I get the "block_start + uvalue" can overflow, but won't this trigger the 
> "data < block_start" part of the test?

Not necessarily.  The pointers may only be 32 bit, which with a 64-bit uvalue
leads to many values of uvalue > 4G that wrap to a "valid" range.  Pointer
comparisons are a pain.  It's much better in this situation to calculate the
max valid size left then compare that with uvalue.

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