<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [CFI] integer to pointer casts are unchecked"
   href="https://bugs.llvm.org/show_bug.cgi?id=39966">39966</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[CFI] integer to pointer casts are unchecked
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>LLVM Codegen
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>eugeni.stepanov@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>struct A {
  virtual void f();
};

void A::f() {}

int main() {
  A *a = reinterpret_cast<A*>(0x1234);
  A *b = reinterpret_cast<A*>(reinterpret_cast<void *>(0x1234));
  (void)a;
  (void)b;
}

The first cast, integer-to-A* does not generate a CFI check.
The second, through void*, does.

Built with
bin/clang++ -fsanitize=cfi -flto -fvisibility=hidden -fuse-ld=lld -S -emit-llvm</pre>
        </div>
      </p>


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