[Bug 2702] New: ssh compiled with --with-ldns segfaults during known_hosts parsing

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2702

            Bug ID: 2702
           Summary: ssh compiled with --with-ldns segfaults during
                    known_hosts parsing
           Product: Portable OpenSSH
           Version: 7.5p1
          Hardware: amd64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: aranea at aixah.de

Created attachment 2968
  --> https://bugzilla.mindrot.org/attachment.cgi?id=2968&action=edit
Backtrace of ssh 7.5p1 segfaulting

When OpenSSH-7.5p1 is compiled with "./configure --with-ldns", ssh
<somehost> segfaults if the host's key is already recorded in
known_hosts.

The current head of the master branch is affected too. Builds with
--without-ldns don't exhibit the problem, and neither does
OpenSSH-7.4p1 (according to git bisect, the commit 523db854 "prefer to
use ldns-config to find libldns" introduced the bug).

My ssh_config is empty, and I've tested this against a variety of
sshd's (including github.com). I'll attach a backtrace; if you need a
coredump or information about my build environment, please let me know.

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