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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/4554/">https://reviewboard.asterisk.org/r/4554/</a>
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<a href="https://reviewboard.asterisk.org/r/4554/diff/1-2/?file=73272#file73272line11116" style="color: black; font-weight: bold; text-decoration: underline;">/branches/13/channels/chan_iax2.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void set_hangup_source_and_cause(int callno, unsigned char causecode)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>//peer_unref(peer);</pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">If this is the last "peer", then releasing it here would mean that peer->pokeexpire would cause a segfault.</pre>
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<a href="https://reviewboard.asterisk.org/r/4554/diff/1-2/?file=73272#file73272line11124" style="color: black; font-weight: bold; text-decoration: underline;">/branches/13/channels/chan_iax2.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void set_hangup_source_and_cause(int callno, unsigned char causecode)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>// peer = peer_unref(peer);</pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">using peer = peer_unref(peer), will cause the segfault in the lines below everytime, which should be considered a good thing. Will show use of a "released" pointer during testing.</pre>
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<a href="https://reviewboard.asterisk.org/r/4554/diff/1-2/?file=73272#file73272line11130" style="color: black; font-weight: bold; text-decoration: underline;">/branches/13/channels/chan_iax2.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void set_hangup_source_and_cause(int callno, unsigned char causecode)</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>if ((peer->lastms < 0) || (peer->historicms > peer->maxms))</pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">potential segfault because of released "peer"</pre>
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<a href="https://reviewboard.asterisk.org/r/4554/diff/1-2/?file=73272#file73272line12319" style="color: black; font-weight: bold; text-decoration: underline;">/branches/13/channels/chan_iax2.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void __iax2_poke_noanswer(const void *data)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span>if (!peer) {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span>return -1;</pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">function is being called with (peer = 0x0), which showed up after messing with the code above. Either this is a real issue, or caused by fiddling with the code.</pre>
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<p>- Diederik de Groot</p>
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<p>On March 29th, 2015, 1:44 a.m. CET, Diederik de Groot wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Diederik de Groot.</div>
<p style="color: grey;"><i>Updated March 29, 2015, 1:44 a.m.</i></p>
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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-24917">ASTERISK-24917</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;">clang's static analyzer will throw quite a number warnings / errors during compilation, some of which can be very helpfull in finding corner-case bugs.
clang compiler warning:-Wunused-value
Changes:
apps/app_agent_pool.c
multiple occasions where return value from ast_channel_ref and ast_channel_unref is not checked not used.
return value from AST_LIST_REMOVE should be checked.
Possible issues with leaked logged reference (added remark)
channels/chan_iax2.c
return values from ast_callid_ref and ast_callid_unref can/should be used to update the pointer
return value from AST_SCHED_DEL should be used to update the scheduled variable
return value from AST_LIST_REMOVE should be checked.
channels/iax2/parser.c
return value from AST_LIST_REMOVE should be checked.
include/asterisk/stringfields.h
Quick fix to send the returned value from ast_string_field_ptr_set into the void.
Work in Progress:
There are too many sources issues with "-Wunused-value" for one person to create all the fixes. If we want to actually use this warning we will need a couple of extra hands-on.
Should we suppress "-Wunused-value" ? :
I think some of the issues pointed out by clang could be very helpfull, for example the "unref/ref/AST_LIST_REMOVE" changes that where needed in chan_iax2.c and apps/app_agent_pool.c. Some others a less interesting, for example the SCHED_DEL fixes.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/13/include/asterisk/stringfields.h <span style="color: grey">(433444)</span></li>
<li>/branches/13/channels/iax2/parser.c <span style="color: grey">(433444)</span></li>
<li>/branches/13/channels/chan_iax2.c <span style="color: grey">(433444)</span></li>
<li>/branches/13/apps/app_agent_pool.c <span style="color: grey">(433444)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/4554/diff/" style="margin-left: 3em;">View Diff</a></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">File Attachments </h1>
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<li><a href="https://reviewboard.asterisk.org/media/uploaded/files/2015/03/28/83f2f382-9ef2-41cf-8e7a-c188c014c17e__make.report">ASTCFLAGS="-Wno-error=unused-value" make &| grep "[-W" -B1 -A2</a></li>
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