// mWeakSecKeyRef is not really valid, pointing to SecKeyRef which going to die - it is somewhere between last CFRelease and entering into mutex-protected section of SecCDSAKeyDestroy. Avoid using it, pretend that no enveloping SecKeyRef exists. But make sure that this KeyImpl is disconnected from this about-to-die SecKeyRef, because we do not want KeyImpl connected to it to be really destroyed, it will be connected to newly created SecKeyRef (see below).
mWeakSecKeyRef->key = NULL;
mWeakSecKeyRef = NULL;
// mWeakSecKeyRef is not really valid, pointing to SecKeyRef which going to die - it is somewhere between last CFRelease and entering into mutex-protected section of SecCDSAKeyDestroy. Avoid using it, pretend that no enveloping SecKeyRef exists. But make sure that this KeyImpl is disconnected from this about-to-die SecKeyRef, because we do not want KeyImpl connected to it to be really destroyed, it will be connected to newly created SecKeyRef (see below).
mWeakSecKeyRef->key = NULL;
mWeakSecKeyRef = NULL;