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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/3603/">https://reviewboard.asterisk.org/r/3603/</a>
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<div>Review request for Asterisk Developers, Joshua Colp and Matt Jordan.</div>
<div>By Corey Farrell.</div>
<p style="color: grey;"><i>Updated June 13, 2014, 2:48 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Changes</h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Modify changes to ast_do_masquerade so AST_JITTERBUFFER_FD is never copied. Copying the FD is never effective without recreating the jitterbuffer framehook - the FD is closed when the clonechan is destroyed. Add datastore fixup to remove datastore from clonechan to prevent having a datastore pointing to memory that is already freed (the old framehook).
1) Fixed - original has JB but clonechan doesn't - JB is maintained.
2) Fixed - original and clonechan have JB - the JB from original is maintained.
3) Half-fixed - clonechan has JB but original doesn't - no JB after masquerade, but also no invalid pointers.</pre>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-22409">ASTERISK-22409</a>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
Asterisk
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">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.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">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.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> (updated)</h1>
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<li>/branches/11/main/channel.c <span style="color: grey">(416102)</span></li>
<li>/branches/11/funcs/func_jitterbuffer.c <span style="color: grey">(416102)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/3603/diff/" style="margin-left: 3em;">View Diff</a></p>
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