WPA: Check wpa_eapol_key_mic() result on TX

Verify that nothing unexpected happened with EAPOL-Key Key MIC
calculation when transmitting EAPOL-Key frames from the Authenticator.
This should not be able to happen in practice, but if if it does, there
is no point in sending out the frame without the correct Key MIC value.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

src/ap/wpa_auth.c

@@ -1571,9 +1571,12 @@ void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
 			return;
 		}
 
-		wpa_eapol_key_mic(sm->PTK.kck, sm->PTK.kck_len,
-				  sm->wpa_key_mgmt, version,
-				  (u8 *) hdr, len, key_mic);
+		if (wpa_eapol_key_mic(sm->PTK.kck, sm->PTK.kck_len,
+				      sm->wpa_key_mgmt, version,
+				      (u8 *) hdr, len, key_mic) < 0) {
+			os_free(hdr);
+			return;
+		}
 #ifdef CONFIG_TESTING_OPTIONS
 		if (!pairwise &&
 		    wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 &&