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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1441/">https://reviewboard.asterisk.org/r/1441/</a>
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<a href="https://reviewboard.asterisk.org/r/1441/diff/3/?file=20724#file20724line164" style="color: black; font-weight: bold; text-decoration: underline;">trunk/main/astmm.c</a>
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(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static inline size_t __ast_sizeof_region(void *ptr)</pre></td>
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<th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">164</font></th>
<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">ptr</span><span class="p">)</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">ptr</span><span class="p">)</span><span class="hl"> </span><span class="p"><span class="hl">{</span></span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">astmm_log</span><span class="p">(</span><span class="s">"WARNING: Freeing NULL pointer in %s of %s, line %d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="ew"> </span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">func</span><span class="p">,</span> <span class="n">file</span><span class="p">,</span> <span class="n">lineno</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <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 am NOT in favor of this change. I have been removing the unnecessary checks before calling free and ast_free because freeing a NULL pointer is allowed. Freeing a NULL pointer is not a double free.
1) Removing the checks simplifies the calling code to potentially just a list of frees.
2) There is no real benefit to the message.
3) Putting this message here requires those checks be put back in just to avoid this silly warning. There are likely hundreds of places where the check before call would need to be added.</pre>
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<a href="https://reviewboard.asterisk.org/r/1441/diff/3/?file=20730#file20730line328" style="color: black; font-weight: bold; text-decoration: underline;">trunk/main/frame.c</a>
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(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void __frame_free(struct ast_frame *fr, int cache)</pre></td>
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<th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">326</font></th>
<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">fr</span><span class="o">-></span><span class="n">data</span><span class="p">.</span><span class="n">ptr</span><span class="p">)</span><span class="ew"> </span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">fr</span><span class="o">-></span><span class="n">data</span><span class="p">.</span><span class="n">ptr</span><span class="p">)</span> <span class="p"><span class="hl">{</span></span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n"><span class="hl">ast</span>_fr<span class="hl">ee</span></span><span class="p">(</span><span class="n">fr</span><span class="o">-></span><span class="n">data</span><span class="p">.</span><span class="n">ptr</span> <span class="o">-</span> <span class="n">fr</span><span class="o">-></span><span class="n">offset</span><span class="p">);</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n"><span class="hl">tmp</span>_fr</span><span class="hl"> </span><span class="o"><span class="hl">=</span></span><span class="hl"> </span><span class="p">(</span><span class="n">fr</span><span class="o">-></span><span class="n">data</span><span class="p">.</span><span class="n">ptr</span> <span class="o">-</span> <span class="n">fr</span><span class="o">-></span><span class="n">offset</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_free</span><span class="p">(</span><span class="n">tmp_fr</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <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;">Since tmp_fr is only used here, it makes more sense to define it here in this block.
Also I think tmp is simply a lousy name. All variables are temporary. A better name would be what the calculated address represents.</pre>
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<a href="https://reviewboard.asterisk.org/r/1441/diff/3/?file=20733#file20733line3197" style="color: black; font-weight: bold; text-decoration: underline;">trunk/res/res_agi.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">int AST_OPTIONAL_API_NAME(ast_agi_register)(struct ast_module *mod, agi_command *cmd)</pre></td>
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<th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">3196</font></th>
<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n"><span class="hl">ast_free</span></span><span class="p"><span class="hl">((</span></span><span class="kt"><span class="hl">char</span></span> <span class="o">*</span><span class="p">)</span> <span class="n">e</span><span class="o">-></span><span class="n">summary</span><span class="p"><span class="hl">)</span>;</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n"><span class="hl">tmp_ch</span></span><span class="hl"> </span><span class="o"><span class="hl">=</span></span><span class="hl"> </span><span class="p"><span class="hl">(</span></span><span class="kt"><span class="hl">void</span></span> <span class="o">*</span><span class="p">)</span><span class="n">e</span><span class="o">-></span><span class="n">summary</span><span class="p">;</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_free</span><span class="p">(<span class="hl">(</span></span><span class="kt"><span class="hl">char</span></span><span class="hl"> </span><span class="o"><span class="hl">*</span></span><span class="p"><span class="hl">)</span></span><span class="hl"> </span><span class="n"><span class="hl">e</span></span><span class="o"><span class="hl">-></span></span><span class="n"><span class="hl">usage</span></span><span class="p">);</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_free</span><span class="p">(</span><span class="n"><span class="hl">tmp_ch</span></span><span class="p">);</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_free</span><span class="p">((</span><span class="kt">char</span> <span class="o">*</span><span class="p">)</span> <span class="n">e</span><span class="o">-></span><span class="n">syntax</span><span class="p">);</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">tmp_ch</span> <span class="o">=</span> <span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="p">)</span><span class="n">e</span><span class="o">-></span><span class="n">usage</span><span class="p">;</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_free</span><span class="p">(<span class="hl">(</span></span><span class="kt"><span class="hl">char</span></span><span class="hl"> </span><span class="o"><span class="hl">*</span></span><span class="p"><span class="hl">)</span></span><span class="hl"> </span><span class="n"><span class="hl">e</span></span><span class="o"><span class="hl">-></span></span><span class="n"><span class="hl">seealso</span></span><span class="p">);</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_free</span><span class="p">(</span><span class="n"><span class="hl">tmp_ch</span></span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">tmp_ch</span> <span class="o">=</span> <span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="p">)</span><span class="n">e</span><span class="o">-></span><span class="n">syntax</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_free</span><span class="p">(</span><span class="n">tmp_ch</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">tmp_ch</span> <span class="o">=</span> <span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="p">)</span><span class="n">e</span><span class="o">-></span><span class="n">seealso</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_free</span><span class="p">(</span><span class="n">tmp_ch</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;">tmp_ch should be defined in this block since it is only used in this block.</pre>
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<p>- rmudgett</p>
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<p>On September 19th, 2011, 3:23 a.m., schmidts wrote:</p>
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<div>Review request for Asterisk Developers and David Vossel.</div>
<div>By schmidts.</div>
<p style="color: grey;"><i>Updated Sept. 19, 2011, 3:23 a.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;">first of all, this is just an idea so be friendly ;)
i have thought about setting a pointer to NULL after it is freed to
avoid segfaults and double free corruptions.
the most important change is to replace the define of ast_free to a
macro which just looks like this:
#define ast_free(x) ({ free((void *)x); x = NULL; })
and also to keep it working proberly change the define of ast_free_ptr
to free instead of ast_free.
the same change happens in astmm.h for malloc debugging calls:
#define ast_free(a) ({ __ast_free((void *) a,__FILE__, __LINE__, __PRETTY_FUNCTION__); a = NULL; })
after doing this changes i have seen a lot of places where a pointer is
cast at the ast_free call to remove the const state of it.
you can see in the diff all this places where this happens but i think
just cast it into void within the macro makes more sense.
because of this small changes the diff is so big, but its the same change on every part of it, except utils.h and astmm.h
only on three places i dont know how to handle this things:
in res_agi.c i had to replace ast_free with free to make it compile, i am sure there would be another way to solve this but i need some help with this.
in config.c i have the same problem like in res_agi.c
format_cap.c is allready cleared with dvossel
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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;">it compiles with and without MALLOC_DEBUG,
it starts
and it do what it should do, the pointer is set to NULL after ast_free</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>trunk/main/frame.c <span style="color: grey">(336161)</span></li>
<li>trunk/main/features.c <span style="color: grey">(336161)</span></li>
<li>trunk/main/datastore.c <span style="color: grey">(336161)</span></li>
<li>trunk/main/event.c <span style="color: grey">(336161)</span></li>
<li>trunk/main/config.c <span style="color: grey">(336161)</span></li>
<li>trunk/apps/app_dial.c <span style="color: grey">(336161)</span></li>
<li>trunk/apps/app_voicemail.c <span style="color: grey">(336161)</span></li>
<li>trunk/channels/chan_sip.c <span style="color: grey">(336161)</span></li>
<li>trunk/include/asterisk/astmm.h <span style="color: grey">(336161)</span></li>
<li>trunk/include/asterisk/utils.h <span style="color: grey">(336161)</span></li>
<li>trunk/main/astmm.c <span style="color: grey">(336161)</span></li>
<li>trunk/main/ccss.c <span style="color: grey">(336161)</span></li>
<li>trunk/main/indications.c <span style="color: grey">(336161)</span></li>
<li>trunk/main/taskprocessor.c <span style="color: grey">(336161)</span></li>
<li>trunk/res/res_agi.c <span style="color: grey">(336161)</span></li>
</ul>
<p><a href="https://reviewboard.asterisk.org/r/1441/diff/" style="margin-left: 3em;">View Diff</a></p>
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