Cherry-pick 1d32f0c. rdar://123161979

    Add some missing null checks for WebAuthn extension options
    rdar://123161979

    Reviewed by Brent Fulgham.

    Add some missing null checks for WebAuthn extension options.

    * Source/WebKit/UIProcess/WebAuthentication/Cocoa/WebAuthenticatorCoordinatorProxy.mm:
    (WebKit::WebAuthenticatorCoordinatorProxy::requestsForRegisteration):
    (WebKit::WebAuthenticatorCoordinatorProxy::requestsForAssertion):

    Canonical link: https://commits.webkit.org/274952@main

Canonical link: https://commits.webkit.org/272448.577@safari-7618.1.15.10-branch

Source/WebKit/UIProcess/WebAuthentication/Cocoa/WebAuthenticatorCoordinatorProxy.mm

@@ -215,7 +215,7 @@ static inline ASAuthorizationPublicKeyCredentialLargeBlobSupportRequirement toAS
             request.get().attestationPreference = toAttestationConveyancePreference(options.attestation).get();
         if (options.authenticatorSelection)
             request.get().userVerificationPreference = toASUserVerificationPreference(options.authenticatorSelection->userVerification).get();
-        if (options.extensions->largeBlob) {
+        if (options.extensions && options.extensions->largeBlob) {
             // These are satisfied by validation in AuthenticatorCoordinator.
             ASSERT(!options.extensions->largeBlob->read && !options.extensions->largeBlob->write);
             request.get().largeBlob = adoptNS([allocASAuthorizationPublicKeyCredentialLargeBlobRegistrationInputInstance() initWithSupportRequirement:toASAuthorizationPublicKeyCredentialLargeBlobSupportRequirement(options.extensions->largeBlob->support)]).get();
@@ -271,7 +271,7 @@ static inline ASAuthorizationPublicKeyCredentialLargeBlobSupportRequirement toAS
         RetainPtr request = adoptNS([[allocASAuthorizationPlatformPublicKeyCredentialProviderInstance() initWithRelyingPartyIdentifier:options.rpId] createCredentialAssertionRequestWithClientData:clientData.get()]);
         if (platformAllowedCredentials)
             request.get().allowedCredentials = platformAllowedCredentials.get();
-        if (options.extensions->largeBlob) {
+        if (options.extensions && options.extensions->largeBlob) {
             // These are satisfied by validation in AuthenticatorCoordinator.
             ASSERT(!options.extensions->largeBlob->support);
             ASSERT(!(options.extensions->largeBlob->read && options.extensions->largeBlob->write));