[asterisk-bugs] [JIRA] (ASTERISK-20149) Crash when faxing SIP to SIP with strictrtp set to yes

[Michal Rybarik (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-20149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=214734#comment-214734 ] 

Michal Rybarik commented on ASTERISK-20149:
-------------------------------------------

Function fsk_rx() in libspandsp is segfaulting probably because it can process only slinear frames, but currently also alaw/ulaw frames are passed to it. Alaw/ulaw frame is usually 160 bytes long, but fsk_rx() is trying to read 320bytes, so segfault may happen.

I'm attaching patch for Asterisk 11 module res_fax_spandsp, it should resolve this issue. Now alaw/ulaw frames are transcoded to slinear before they are passed to libspandsp, and other frame formats are ignored. (Other frames will probably never reach this place, but I rather check it).

If you still have problem after applying this patch, set debug level to 5, make call, and attach asterisk log then... 
                
> Crash when faxing SIP to SIP with strictrtp set to yes
> ------------------------------------------------------
>
>                 Key: ASTERISK-20149
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20149
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_fax, Resources/res_fax_spandsp
>    Affects Versions: 10.6.0, 11.5.0
>            Reporter: Alexandr Gordeev
>            Assignee: Alexandr Gordeev
>            Severity: Critical
>         Attachments: backtrace.1346914431.1467.11, backtrace_20120719.txt, backtrace_20120720.txt, backtrace_20121205.txt, backtrace_20130814_2.txt, backtrace_20130814.txt, full_20120719.txt, full_20120720.txt, t38_gw_crash_dec_20.backtrace, t38_gw_crash_dec_20.pcap.gz, traffic_20120719.dump, traffic_20120720.dump
>
>
> Crash Asterisk (2) when faxing.
> Schema :
> Other PBX - > pri - > Asterisk 10.6.0 (1) - > sip,g729,t38 - > Asterisk 10.6.0 (2) - > sip,g711,t30- > Other PBX

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