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CoreFoundation socket leak?

When creating a listening socket using the following call:

socketRef = CFSocketCreateWithSocketSignature(NULL, &signature, kCFSocketAcceptCallBack, MCFSocketCallback, &socketContext);
if (socketRef != NULL)
{
}

But the bind fails because another process is currently using the port, the file handle seems to be leaked.

The returned socketRef is NULL, so I can't call CFSocketinvalidate to clean it up, but lsof shows:

CSPRelay 11408 mlaster 16u inet 0x039cfd1c 0t0 TCP *:* (CLOSED)
CSPRelay 11408 mlaster 17u inet 0x03887d1c 0t0 TCP *:5678 (LISTEN)

The 16u handle was from a failed attempt, and the 17u handle was from the second time I called it after freeing up port 5678.

Is this a bug in CoreFoundation, or is there something I need to do to get rid of sockets that failed to bind?
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