Description

Applying a simple {s.prefixes} transformation on a variable with an empty value crashes Kamailio. It is not specific to a particular SIP message being processed.

Troubleshooting

Reproduction

request_route {
        $var(empty) = "";
        $var(result) = $(var(empty){s.prefixes});
        drop;
}

Debugging Data

(paste your debugging data here)

Log Messages

kernel: [27707776.714159] kamailio[13060]: segfault at 562232762ff0 ip 00007f82a1e76391 sp 00007ffc3bc7fcd8 error 4 in libc-2.24.so[7f82a1d4d000+195000]

SIP Traffic

Any SIP traffic will do, as long as this particular scenario is hit, for whatever reason. Could be buggy business logic.

Possible Solutions

The only thing I could think of is to place the transformation inside an if statement which checks for an empty value of the variable the {s.prefixes] transformation is being applied to.

Additional Information

I've tested this with Kamailio 5.1 and 5.4, and both have this issue.

• Kamailio Version - output of kamailio -v

version: kamailio 5.4.0 (x86_64/linux)
version: kamailio 5.1.10 (x86_64/linux)

• Operating System:

Kamailio 5.1.10 -> Debian GNU/Linux 9.13 (stretch)
Kamailio 5.4.0 -> Debian GNU/Linux 9.8 (stretch)

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