Re: Bug in numeric multiplication

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>
Cc: PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Bug in numeric multiplication
Date: 2015-11-17 14:43:03
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Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> writes:
> I just noticed that div_var_fast() has almost identical code, and so
> in principle it has the same vulnerability, although it obviously only
> affects the transcendental functions.
> I don't actually have a test case that triggers it, but it's basically
> the same algorithm, so logically it needs the same additional headroom
> to avoid a possible overflow.

Hm, good point. I don't feel a compulsion to have a test case that
proves it's broken before we fix it. Do you want to send a patch?

regards, tom lane

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