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From: "joerg at bec dot de" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug nscd/29605] New: Regression in NSCD backend of getaddrinfo
Date: Fri, 23 Sep 2022 11:19:58 +0000
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X-Bugzilla-Version: 2.36
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X-Bugzilla-Severity: critical
X-Bugzilla-Who: joerg at bec dot de
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29605

            Bug ID: 29605
           Summary: Regression in NSCD backend of getaddrinfo
           Product: glibc
           Version: 2.36
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: nscd
          Assignee: unassigned at sourceware dot org
          Reporter: joerg at bec dot de
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Created attachment 14354
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D14354&action=3Ded=
it
Restore correct index.

When using getaddrinfo with running nscd and address family hints, corrupted
entries may be returned. In my case, "ssh -6 dual-stack-host" will normally=
 see
the A record first and the AAAAA record second. The returned entry from gai
contains an address family of 0, which is nonsense.

Debugging points to getaddrinfo.c line 543 (refactored in
e7e5315b7fa065a9c8bf525ca9a32f46fa4837e5). That use of count is highly
suspicious and doesn't make sense to me. The attached patch shows what I me=
an,
but I can't test it easily.

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