[exim-dev] [Bug 2383] New: Segfault on CSA check caused by C…

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Nowe tematy: [exim-dev] [Bug 2383] Segfault on CSA check caused by CNAME in DNS
Temat: [exim-dev] [Bug 2383] New: Segfault on CSA check caused by CNAME in DNS
https://bugs.exim.org/show_bug.cgi?id=2383

            Bug ID: 2383
           Summary: Segfault on CSA check caused by CNAME in DNS
           Product: Exim
           Version: N/A
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: bug
          Priority: medium
         Component: ACLs
          Assignee: jgh146exb@???
          Reporter: michael@???
                CC: exim-dev@???


Segfaults on some connections when doing a "verify=csa" in an acl.

Syslog:
Mar 14 11:02:32 kernel: [404922.048624] exim[7892]: segfault at 55a883cd3000 ip
000055a881b84746 sp 00007ffd6e48b730 error 4 in exim-4.92[55a881b48000+102000]

Debug log:
11:02:32 7892 check verify = csa
11:02:32 7892 CSA lookup of smtp407.td3x.com
11:02:32 7892 DNS lookup of _client._smtp.smtp407.td3x.com (SRV) succeeded
11:02:32 7892 CNAME found: change to td3x.com
11:02:32 7788 child 7892 ended: status=0x8b
11:02:32 7788 signal exit, signal 11 (core dumped)
11:02:32 7788 0 SMTP accept processes now running

nslookup:
> set type=srv
> _client._smtp.smtp407.td3x.com

Server:         127.0.0.1
Address:        127.0.0.1#53
Non-authoritative answer:
_client._smtp.smtp407.td3x.com  canonical name = td3x.com.


Then "No answer" for a SRV record on td3x.com.

Turning off "verify=csa" allows the connection to proceed.

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