[PATCH][BZ #15698] Fix memory overrun in getifaddrs_internal.

[Ondřej Bílka]

On Sat, Jan 11, 2014 at 01:35:30PM -0500, Mike Frysinger wrote:
> On Tuesday 08 October 2013 12:57:38 Ondřej Bílka wrote:
> > Hi, a code at https://sourceware.org/bugzilla/show_bug.cgi?id=15698
> > contains a simple off-by-one error when preflen is divisible by 8.
> > 
> > Following code should fix this, as preflen is unsigned I added check for
> > zero len to be sure we do not cause underflow.
> > 
> > OK to commit?
> 
> test case ?
> -mike

That is difficult, after browsing code a prefixlen is read from kernel 
netlink interface. To trigger this bug we would need to create a dummy
interface which needs root.