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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - warn on (sometimes?) dereference of one-past-end pointer"
href="http://llvm.org/bugs/show_bug.cgi?id=15535">15535</a>
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<th>Summary</th>
<td>warn on (sometimes?) dereference of one-past-end pointer
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>nicholas@mxc.ca
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>I'd like something like -Wuninitialized/-Wsometimes-uninitialized but which
keeps track of pointers that are known to point to one-past-the-end of an
array, and warn when dereferenced.
For motivation, see the example code in <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Loop Optimizer Problems"
href="show_bug.cgi?id=15522">bug 15522</a> which clang issues no
warnings for. If the program instead asked for "long *pk = &buf[3];" clang
would issue a warning with -Warray-bounds because that's two past the end of
the array and consequently always invalid.
char buf[2];
char *p = &buf[2];
*p = '\0'; // please warn here.
Also, using the same logic from the -Wsometimes-uninitialized flag, I'd also
like this:
char buf[2];
char *p = &buf[2];
if (condition) {
*p = '\0'; // please warn in here as well.
}</pre>
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</p>
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