Maintained by: NLnet Labs

[Unbound-users] Request more info on bug fix for 1.4.21

W.C.A. Wijngaards
Thu Oct 10 09:09:30 CEST 2013


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Hi Hannah,

On 10/10/2013 01:46 AM, Hannah Van Eenoo wrote:
> Hi there!
> 
> I was reading the changelogs for version 1.4.21 and came across
> this bug fix listed but without a Bugzilla link: “Fix queries
> leaking up for stubs and forwards, if the configured nameservers
> all fail to answer.”
> 
> I was wondering how I could get more information on how this
> problem manifested (or was found), what code change the fix
> involved and whether or not my version was susceptible in the first
> place. I’m happy to do the footwork, just need some pointing in the
> right direction.

This bug involved unbound failing to resolve at all nameservers, and
then trying to get the parental-delegation information.  This is great
to resolve troublesome names normally, but when a configuration entry
is present, this is not supposed to happen.  The issue was code in
iterator/iterator.c:can_have_last_resort() which was fixed for this
issue (commit r2882).

Best regards,
   Wouter

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