This was fixed upstream, in release 2.77.

Simon.


On 18/07/18 14:59, Frank Klaassen wrote:
> Public bug reported:
> 
> If one would add a CNAME-record that would point to itself like so:
> CNAME=test.example.com,test.example.com
> 
> This will result in a segfault and crash of the dnsmasq process.
> 
> Segfault on 14.04 / dnsmasq 2.68:
> dnsmasq[22762]: segfault at 7ffe1727dff8 ip 00007f7c60cde755 sp 
> 00007ffe1727dff0 error 6 in libc-2.19.so[7f7c60c5e000+1be000]
> 
> Segfault on 16.04 / dnsmasq 2.75:
> dnsmasq[21097]: segfault at 7ffc4bf90ff8 ip 00007f268bf7ebbc sp 
> 00007ffc4bf90ff0 error 6 in libc-2.23.so[7f268befd000+1c0000]
> 
> 
> Ubuntu versions affected: Ubuntu 14.04.5 LTS & Ubuntu 16.04.4 LTS
> 
> dnsmasq version (14.04) 2.68-1ubuntu0.2
> dnsmasq version (16.04): 2.75-1ubuntu0.16.04.5
> 
> ** Affects: dnsmasq (Ubuntu)
>      Importance: Undecided
>          Status: New
>

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https://bugs.launchpad.net/bugs/1782362

Title:
  dnsmasq segfaults on cnames referring to themselves

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