[patch] libstdc++/66327 don't pass null pointers to memcmp

Jörg Richter joerg.richter@pdv-fs.de
Fri May 29 19:55:00 GMT 2015


Jonathan Wakely <jwakely <at> redhat.com> writes:

> This is a rather brute force fix, but if noone has any better ideas
> I'll commit this to the trunk and 4.9 and 5 branches tomorrow. (I
> think it should go on the branches, because 4.9 is known to optimise
> away null pointer checks after invalid calls to memcmp like this).

How about comparing only the length against 0? 
The pointers must be != 0 if length > 0.

- Jörg


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