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

[Mike Frysinger]

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
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