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    <a href="https://reviewboard.asterisk.org/r/2182/diff/2/?file=32131#file32131line104" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/main/astmm.c</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">enum func_type {</pre></td>

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    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">91</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">fence</span><span class="p">;</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">91</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">fence</span><span class="p">;</span></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;">I&#39;m probably being overly pedantic about this, but it&#39;s a bit confusing that reg-&gt;fence may or may not be the actual fence, depending on how the alignment works out.</pre>
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    <a href="https://reviewboard.asterisk.org/r/2182/diff/2/?file=32131#file32131line193" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/main/astmm.c</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">AST_MUTEX_DEFINE_STATIC_NOTRACKING(reglock);</pre></td>

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    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="n">fence</span> <span class="o">=</span> <span class="p">(</span><span class="kt">unsigned</span> <span class="kt">int</span> <span class="o">*</span><span class="p">)</span> <span class="p">(</span><span class="n">reg</span><span class="o">-&gt;</span><span class="n">data</span> <span class="o">-</span> <span class="k">sizeof</span><span class="p">(</span><span class="o">*</span><span class="n">fence</span><span class="p">));</span></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;">It&#39;s worth a comment as to why you don&#39;t just use reg-&gt;fence to access the fence.</pre>
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   <td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
   <td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void region_check_fences(struct ast_region *reg)</pre></td>

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    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="n">fence</span> <span class="o">=</span> <span class="p">(</span><span class="kt">unsigned</span> <span class="kt">int</span> <span class="o">*</span><span class="p">)</span> <span class="p">(</span><span class="n">reg</span><span class="o">-&gt;</span><span class="n">data</span> <span class="o">-</span> <span class="k">sizeof</span><span class="p">(</span><span class="o">*</span><span class="n">fence</span><span class="p">));</span></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;">It&#39;s worth a comment as to why you don&#39;t just use reg-&gt;fence to access the fence.</pre>
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<p>- David</p>


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<p>On November 7th, 2012, 2:55 p.m., rmudgett wrote:</p>






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<div>Review request for Asterisk Developers.</div>
<div>By rmudgett.</div>


<p style="color: grey;"><i>Updated Nov. 7, 2012, 2:55 p.m.</i></p>




<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;">MALLOC_DEBUG enhancements.

* Makes malloc() behave like calloc().  It will return a memory block
filled with 0x55.  A nonzero value.

* Makes free() fill the released memory block and boundary fence&#39;s with
0xdeaddead.  Any pointer use after free is going to have a pointer
pointing to 0xdeaddead.  The 0xdeaddead pointer is usually an invalid
memory address so a crash is expected.

* Puts the freed memory block into a circular array so it is not reused
immediately.

* When the circular array rotates out a memory block to the heap it checks
that the memory has not been altered from 0xdeaddead.

* Made the astmm_log message wording better.

* Made crash if the DO_CRASH menuselect option is enabled and something is
found.

* Fixed a potential alignment issue on 64 bit systems.
struct ast_region.data[] should now be aligned correctly for all platforms.

* Extracted region_check_fences() from __ast_free_region() and
handle_memory_show().

* Updated handle_memory_show() CLI usage help.
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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;">The MALLOC_DEBUG enhancements were instrumental in pointing out a memory corruption problem.
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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 <li>/branches/1.8/include/asterisk/astmm.h <span style="color: grey">(376023)</span></li>

 <li>/branches/1.8/include/asterisk/utils.h <span style="color: grey">(376023)</span></li>

 <li>/branches/1.8/main/asterisk.c <span style="color: grey">(376023)</span></li>

 <li>/branches/1.8/main/astmm.c <span style="color: grey">(376023)</span></li>

 <li>/branches/1.8/main/utils.c <span style="color: grey">(376023)</span></li>

</ul>

<p><a href="https://reviewboard.asterisk.org/r/2182/diff/" style="margin-left: 3em;">View Diff</a></p>




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