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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