USB: cdc-wdm: fix memory leak
cleanup() is not called if the last close() comes after disconnect(). That leads to a memory leak. Rectified by checking for an earlier disconnect() in release() Signed-off-by: Oliver Neukum <oneukum@suse.de> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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