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Review request for Asterisk Developers.
Bugs: ASTERISK-22409
https://issues.asterisk.org/jira/browse/ASTERISK-22409
Repository: Asterisk
Description
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During masquerade it is possible for the AST_JITTERBUFFER_FD to be cleared (set
to -1). This change adds a check when copying channel fd's to prevent clearing
an FD with -1. This seems to resolve the bad audio quality experienced after
the masquerade. When AST_JITTERBUFFER_FD was set to -1, this prevented the
channel from polling that timer. This caused RTP packets to be received late,
and discarded.
The changes to func_jitterbuffer.c were created first. ast_free(jbframe); is
needed to prevent jbframe from leaking if it is rejected by jb_impl. This
ensures we don't start leaking packets if they are received too late or
rejected by jb_impl for any other reason.
The second change to func_jitterbuffer prevents a leak of ast_null_frame's that
were duplicated (ie with ast_frdup or ast_frisolate). I believe this leak
might actually be unrelated to the masquerade issue, and likely occurs for
every single ast_null_frame.
Diffs
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/branches/11/main/channel.c 415593
/branches/11/funcs/func_jitterbuffer.c 415593
Diff: https://reviewboard.asterisk.org/r/3603/diff/
Testing
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Verified the scenario outlined in ASTERISK-22409 no longer experiences audio
quality loss, and no longer causes leaks (tested under valgrind). I patched
asterisk to ensure that ast_frfree performed an immediate free to ensure
valgrind would report any attempted use after free.
In early testing, I used debug messages instead of the added ast_frfree's - I
verified the leaked frames reported by valgrind matched exactly to the number
of debug messages.
For the masquerade fix I tested with some debug code that showed the old and
new FD, this is how I found the valid FD being replaced by -1. See JIRA ticket
for example output.
I have not tested this issue or fix against 12+, but the relevant code is the
same as 11 - func_jitterbuffer code was moved to core but still the same code.
Thanks,
Corey Farrell
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