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(Updated July 30, 2014, 7:19 p.m.) Review request for Asterisk Developers, Joshua Colp and Matt Jordan. Changes ------- Correct issues in chan_fixup callback. Only ast_frfree(jbframe) when it != frame. jb_helper was split due to channels already being locked during masquerade. Retested 1) with jitterbuffer enabled in confbridge.conf 2) with setvar=JITTERBUFFER(adaptive)=default in sip.conf 3) with both set. All 3 cases no loss of audio. Bugs: ASTERISK-22409 https://issues.asterisk.org/jira/browse/ASTERISK-22409 Repository: Asterisk Description ------- 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 (updated) ----- /branches/11/main/channel.c 419821 /branches/11/funcs/func_jitterbuffer.c 419821 Diff: https://reviewboard.asterisk.org/r/3603/diff/ Testing ------- 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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