[asterisk-bugs] [JIRA] (ASTERISK-28532) Segfault at res_rtp_multicast.c:211 (function set_type)

[Asterisk Team (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-28532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=247964#comment-247964 ] 

Asterisk Team commented on ASTERISK-28532:
------------------------------------------

Thanks for creating a report! The issue has entered the triage process. That means the issue will wait in this status until a Bug Marshal has an opportunity to review the issue. Once the issue has been reviewed you will receive comments regarding the next steps towards resolution.

A good first step is for you to review the [Asterisk Issue Guidelines|https://wiki.asterisk.org/wiki/display/AST/Asterisk+Issue+Guidelines] if you haven't already. The guidelines detail what is expected from an Asterisk issue report.

Then, if you are submitting a patch, please review the [Patch Contribution Process|https://wiki.asterisk.org/wiki/display/AST/Patch+Contribution+Process].

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> Segfault at res_rtp_multicast.c:211 (function set_type)
> -------------------------------------------------------
>
>                 Key: ASTERISK-28532
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28532
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_rtp_multicast
>    Affects Versions: 13.21.0
>         Environment: Ubuntu 18.04
>            Reporter: Martin Ledderboge
>
> Asterisk will crash with a segmention fault on sending a multicast rtp stream.
> In res_rtp_multicast at line 289 (multicast_rtp_new) the void pointer data is cast to ast_multicast_rtp_options*, but in fact it should be a char*.
> Backtrace:
> Thread 3 "asterisk" received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 9502.9717]
> __strcasecmp_l_avx () at ../sysdeps/x86_64/multiarch/strcmp-sse42.S:198
> 198	../sysdeps/x86_64/multiarch/strcmp-sse42.S: No such file or directory.
> (gdb) bt
> #0  __strcasecmp_l_avx () at ../sysdeps/x86_64/multiarch/strcmp-sse42.S:198
> #1  0x00007fffb3284362 in set_type (multicast=<optimized out>, type=0x3332006369736162 <error: Cannot access memory at address 0x3332006369736162>) at res_rtp_multicast.c:211
> #2  multicast_rtp_new (instance=0x7fffe4120bc0, sched=<optimized out>, addr=<optimized out>, data=0x7fff7ee5f380) at res_rtp_multicast.c:295
> #3  0x00005555556bd7e5 in ast_rtp_instance_new (engine_name=engine_name at entry=0x7fff8bf547a0 "multicast", sched=sched at entry=0x0, sa=sa at entry=0x7fff7ee5f3d0, data=data at entry=0x7fff7ee5f380) at rtp_engine.c:468
> #4  0x00007fff8bf54572 in multicast_rtp_request (type=<optimized out>, cap=<optimized out>, assignedids=0x0, requestor=0x7fffcc0a3510, data=<optimized out>, cause=0x7fff7ee5f704) at chan_multicast_rtp.c:156
> #5  0x0000555555601823 in ast_request (type=0x7fffe417e3d8 "MulticastRTP", request_cap=request_cap at entry=0x7fffcc0188b8, assignedids=assignedids at entry=0x0, requestor=requestor at entry=0x7fffcc0a3510, addr=0x7fffe417e3f2 "basic/239.255.255.240:10001", cause=cause at entry=0x7fff7ee5f704) at channel.c:6274
> #6  0x00007fff8747fa2d in dial_exec_full (chan=0x7fffcc0a3510, data=<optimized out>, peerflags=peerflags at entry=0x7fff7ee60290, continue_exec=continue_exec at entry=0x0) at app_dial.c:2521
> Steps to reproduce, create a Lua dialplan extension with the following content:
> ~~~
> extensions = {
>     ['context'] ) {
>         ['_150'] = function(context, extension)
>             local snd = '/path/to/some/wavfile'
>             app.dial('MulticastRTP/basic/239.255.255.240:'..tostring(port)..',60,tTwA('.. snd ..')'
>         end;
>     }
> }
> ~~~



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