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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - null pointer dereference in libfuzzer?"
href="https://bugs.llvm.org/show_bug.cgi?id=33091">33091</a>
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</tr>
<tr>
<th>Summary</th>
<td>null pointer dereference in libfuzzer?
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<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>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>agostino.sarubbo@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18466" name="attach_18466" title="stacktrace1">attachment 18466</a> <a href="attachment.cgi?id=18466&action=edit" title="stacktrace1">[details]</a></span>
stacktrace1
This is the first time I tried to use libfuzzer, I'd like to understand if I
did something bad on my side.
I downloaded this:
<a href="https://github.com/google/oss-fuzz/blob/master/projects/curl/curl_fuzzer.cc">https://github.com/google/oss-fuzz/blob/master/projects/curl/curl_fuzzer.cc</a>
I compiled it with:
clang++ -g3 -fsanitize=address,undefined -fsanitize-coverage=trace-pc-guard
curl_fuzzer.cc -lcurl /usr/lib64/libFuzzer.a -o curl_libfuzzer
while I launch ./curl_libfuzzer I get (see stacktrace1):
==19775==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc
0x000000000000 bp 0x000000000000 sp 0x7ffe82b616b8 T0)
after that I tried to do the same thing with libfuzzer compiled with
asan/ubsan,
I get more info but the same result (see stacktrace2).
I have clang 4.0.0 and libfuzzer 3.9.1</pre>
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