[PATCH] malloc/malloc.c: Mitigate null-byte overflow attacks

[DJ Delorie]

Florian Weimer <fweimer@redhat.com> writes:
> I think it would make sense to have different error messages in both 
> cases, to make crash reports more meaningful.  And __glibc_unlikely 
> should be used.

Done.

> DJ, could you commit this in Moritz' name with a proper changelog
> entry?

Also done.

Thanks!