add null sanity check to wolfSSL_SESSION_get_max_early_data, CID 516264

Author: JacobBarthelmeh

src/ssl_sess.c

@@ -3534,6 +3534,10 @@ int wolfSSL_SESSION_get_master_key_length(const WOLFSSL_SESSION* ses)
 #ifdef WOLFSSL_EARLY_DATA
 unsigned int wolfSSL_SESSION_get_max_early_data(const WOLFSSL_SESSION *session)
 {
+    if (session == NULL) {
+        return BAD_FUNC_ARG;
+    }
+
     return session->maxEarlyDataSz;
 }
 #endif /* WOLFSSL_EARLY_DATA */

tests/quic.c

@@ -1675,6 +1675,9 @@ static int test_quic_early_data(int verbose) {
     QuicTestContext_free(&tclient);
     QuicTestContext_free(&tserver);
 
+    /* check for error value with null argument */
+    ExpectIntEQ(wolfSSL_SESSION_get_max_early_data(NULL), BAD_FUNC_ARG);
+
     /* QUIC requires 0 or 0xffffffff as only allowed values.
      * Since we enabled early data in the server that created the session,
      * we need to see it here. */