[Bug network/14841] New: RRSIG confuses getaddrinfo: getaddrinfo*.gaih_getanswer: got type "46"

["lekensteyn at gmail dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14841

             Bug #: 14841
           Summary: RRSIG confuses getaddrinfo:
                    getaddrinfo*.gaih_getanswer: got type "46"
           Product: glibc
           Version: 2.16
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
        AssignedTo: unassigned@sourceware.org
        ReportedBy: lekensteyn@gmail.com
    Classification: Unclassified


Created attachment 6736
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6736
getaddrinfo-bug.c

Since 13 November 2012 I see the following messages in my syslog from Firefox:

    getaddrinfo*.gaih_getanswer: got type "46"

This is printed when using Google's public DNS server 8.8.4.4. "46" is RRSIG
according to Wikipedia and my Wireshark output. The error message comes from
resolv/nss_dns/dns-host.c:1147

I have attached C source code that exposes this bug.

Steps to reproduce:
1. Use a DNS server that responds with the DNSSEC field "RRSIG" (like 8.8.4.4).
2. gcc getaddrinfo-bug.c -o getaddrinfo-bug && ./getaddrinfo-bug.
3. Look in the syslog.

I have verified that this message does not occur if I use a DNS server that
does not gives a response containing a RRSIG field.

Tested with Arch Linux glibc version 2.16.0-5 and an unpatched 2.16.0 build.

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