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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - null ptr deref warning after call to non returning function"
href="http://llvm.org/bugs/show_bug.cgi?id=22263">22263</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>null ptr deref warning after call to non returning function
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Static Analyzer
</td>
</tr>
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<th>Assignee</th>
<td>kremenek@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nick@mozilla.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13702" name="attach_13702" title="results of running scan build">attachment 13702</a> <a href="attachment.cgi?id=13702&action=edit" title="results of running scan build">[details]</a></span>
results of running scan build
Using checker-276, we have code that basically handles our own memory
allocations [0], something like [1]:
void * my_malloc (size_t sz) {
void * p = malloc(sz);
if (p == NULL) {
fprintf(stderr, "out of memeory");
abort();
}
}
Now, throughout our code we have instances where we get warnings about null
pointer derefs right after calling this function [2].
ex:
somevar = my_malloc(some_size);
somevar->member;
And we'll get a warning about a possible pointer dereference from the second
statement. This isn't right, because the allocation function checks if null
then aborts the process.
Please see [3] and [4] for more info. Thanks!
[0]
<a href="https://github.com/h2o/h2o/blob/35707d051e30a3a986b66eb317e2c711b221795c/include/h2o/memory.h#L243-L249">https://github.com/h2o/h2o/blob/35707d051e30a3a986b66eb317e2c711b221795c/include/h2o/memory.h#L243-L249</a>
[1]
<a href="https://github.com/h2o/h2o/blob/9cb45394b00f3ca9644ca99ca3d28f96a089835a/lib/common/memory.c#L57-L61">https://github.com/h2o/h2o/blob/9cb45394b00f3ca9644ca99ca3d28f96a089835a/lib/common/memory.c#L57-L61</a>
[2]
<a href="https://github.com/h2o/h2o/blob/9cb45394b00f3ca9644ca99ca3d28f96a089835a/lib/handler/configurator/expires.c#L63-L65">https://github.com/h2o/h2o/blob/9cb45394b00f3ca9644ca99ca3d28f96a089835a/lib/handler/configurator/expires.c#L63-L65</a>
[3] <a href="https://github.com/h2o/h2o/issues/107">https://github.com/h2o/h2o/issues/107</a>
[4] <a href="https://github.com/h2o/h2o/pull/108#issuecomment-70044354">https://github.com/h2o/h2o/pull/108#issuecomment-70044354</a></pre>
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