[PATCH][BZ 21295] getaddrinfo: do not overwrite IPv6 IPs with IPv4 when using AF_UNSPEC

[Florian Weimer]

On 03/23/2017 02:21 PM, kmeaw@kmeaw.com wrote:
> CVE-2016-3706 patch introduces a regression which disrupts connectivity
> from IPv6-only to dual-stack hosts. This is caused by
> convert_hostent_to_gaih_addrtuple which frees the result opposed to
> appending to it (prior to the CVE patch in gaih_inet).
> 
> This change replaces free(*result) call with a loop which looks for the
> pointer to the end of the linked list (&(*result)->next), so successive
> calls append the result to the list instead of overwriting it.
> 
> Bugzilla entry #21295 describes a way to reproduce the issue.

Thanks.  I have pushed your patch along with a test case tweak to cover
this area of getaddrinfo.

Thanks,
Florian
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