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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Report false positive leak of memory"
href="https://llvm.org/bugs/show_bug.cgi?id=26691">26691</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Report false positive leak of memory
</td>
</tr>
<tr>
<th>Product</th>
<td>tools
</td>
</tr>
<tr>
<th>Version</th>
<td>3.8
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>analyze
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tony@airtame.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>OSX 10.11.3
checker-278
clang version 3.8.0
A function is used to post a message in a priority queue. The thread dequeuing
the message is freeing it with "free(message);". Scan-build report no error
when the message is enqueued in the body of the function that allocated it but
report a problem if the message is enqueued by another function. An example is
illustrated below.
------
Example 1:
// No problem reported
int32_t send_message(void *data, void *message_queue)
{
Msg_t *message = calloc(1, sizeof(Msg_t));
message->type = MSG_TYPE_SEND_MESSAGE;
message->data[0] = data;
mq_enqueue_message(message_queue, PRIORITY_HIGH, (void *)message);
return OK;
}
------
Example 2:
// Potential leak of memory pointed to by 'message'
int32_t send_message(void *data, void *message_queue)
{
Msg_t *message = calloc(1, sizeof(Msg_t));
message->type = MSG_TYPE_SEND_MESSAGE;
message->data[0] = data;
return enqueue(message, message_queue);
}
int32_t enqueue(Msg_t *message, void *message_queue)
{
mq_enqueue_message(message_queue, PRIORITY_HIGH, (void *)message);
return OK;
}
------</pre>
</div>
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