diff --git a/library/ecp.c b/library/ecp.c
index 402d5dedb..80adc55c8 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -2051,7 +2051,7 @@ static int ecp_mul_comb_core( const mbedtls_ecp_group *grp, mbedtls_ecp_point *R
 
         int have_rng = 1;
 #if defined(MBEDTLS_ECP_NO_INTERNAL_RNG)
-        if( f_rng == 0 )
+        if( f_rng == NULL )
             have_rng = 0;
 #endif
         if( have_rng )
@@ -2190,7 +2190,7 @@ final_norm:
      */
     int have_rng = 1;
 #if defined(MBEDTLS_ECP_NO_INTERNAL_RNG)
-    if( f_rng == 0 )
+    if( f_rng == NULL )
         have_rng = 0;
 #endif
     if( have_rng )
diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index 5df2758da..3475aa42f 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -1089,11 +1089,6 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
      * RFC 5077 section 3.4: "When presenting a ticket, the client MAY
      * generate and include a Session ID in the TLS ClientHello."
      */
-    renegotiating = 0;
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-    if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
-        renegotiating = 1;
-#endif
     if( !renegotiating )
     {
         if( ssl->session_negotiate->ticket != NULL &&
@@ -1209,11 +1204,6 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
     /*
      * Add TLS_EMPTY_RENEGOTIATION_INFO_SCSV
      */
-    renegotiating = 0;
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-    if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
-        renegotiating = 1;
-#endif
     if( !renegotiating )
     {
         MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding EMPTY_RENEGOTIATION_INFO_SCSV" ) );
@@ -2065,6 +2055,30 @@ static int ssl_parse_hello_verify_request( mbedtls_ssl_context *ssl )
 }
 #endif /* MBEDTLS_SSL_PROTO_DTLS */
 
+static int is_compression_bad( mbedtls_ssl_context *ssl, unsigned char comp )
+{
+    int bad_comp = 0;
+
+    /* Suppress warnings in some configurations */
+    (void) ssl;
+#if defined(MBEDTLS_ZLIB_SUPPORT)
+    /* See comments in ssl_write_client_hello() */
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+    if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+        comp != MBEDTLS_SSL_COMPRESS_NULL )
+        bad_comp = 1;
+#endif
+
+    if( comp != MBEDTLS_SSL_COMPRESS_NULL &&
+        comp != MBEDTLS_SSL_COMPRESS_DEFLATE )
+        bad_comp = 1;
+#else /* MBEDTLS_ZLIB_SUPPORT */
+    if( comp != MBEDTLS_SSL_COMPRESS_NULL )
+        bad_comp = 1;
+#endif/* MBEDTLS_ZLIB_SUPPORT */
+    return bad_comp;
+}
+
 MBEDTLS_CHECK_RETURN_CRITICAL
 static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
 {
@@ -2073,9 +2087,6 @@ static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
     size_t ext_len;
     unsigned char *buf, *ext;
     unsigned char comp;
-#if defined(MBEDTLS_ZLIB_SUPPORT)
-    int accept_comp;
-#endif
 #if defined(MBEDTLS_SSL_RENEGOTIATION)
     int renegotiation_info_seen = 0;
 #endif
@@ -2244,23 +2255,7 @@ static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
      */
     comp = buf[37 + n];
 
-    int bad_comp = 0;
-#if defined(MBEDTLS_ZLIB_SUPPORT)
-    /* See comments in ssl_write_client_hello() */
-    accept_comp = 1;
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
-        accept_comp = 0;
-#endif
-
-    if( comp != MBEDTLS_SSL_COMPRESS_NULL &&
-        ( comp != MBEDTLS_SSL_COMPRESS_DEFLATE || accept_comp == 0 ) )
-        bad_comp = 1;
-#else /* MBEDTLS_ZLIB_SUPPORT */
-    if( comp != MBEDTLS_SSL_COMPRESS_NULL )
-        bad_comp = 1;
-#endif/* MBEDTLS_ZLIB_SUPPORT */
-    if( bad_comp )
+    if( is_compression_bad( ssl, comp ) )
     {
         MBEDTLS_SSL_DEBUG_MSG( 1,
             ( "server hello, bad compression: %d", comp ) );
@@ -2693,7 +2688,7 @@ static int ssl_check_server_ecdh_params( const mbedtls_ssl_context *ssl )
     grp_id = ssl->handshake->ecdh_ctx.grp.id;
 #else
     grp_id = ssl->handshake->ecdh_ctx.grp_id;
-#endif
+#endif /* MBEDTLS_ECDH_LEGACY_CONTEXT */
 
     curve_info = mbedtls_ecp_curve_info_from_grp_id( grp_id );
     if( curve_info == NULL )
@@ -2704,17 +2699,14 @@ static int ssl_check_server_ecdh_params( const mbedtls_ssl_context *ssl )
 
     MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDH curve: %s", curve_info->name ) );
 
-    int bad_params = 0;
 #if defined(MBEDTLS_ECP_C)
     if( mbedtls_ssl_check_curve( ssl, grp_id ) != 0 )
-        bad_params = 1;
+        return( -1 );
 #else
     if( ssl->handshake->ecdh_ctx.grp.nbits < 163 ||
         ssl->handshake->ecdh_ctx.grp.nbits > 521 )
-        bad_params = 1;
-#endif
-    if( bad_params )
         return( -1 );
+#endif /* MBEDTLS_ECP_C */
 
     MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
                             MBEDTLS_DEBUG_ECDH_QP );
@@ -3462,25 +3454,23 @@ start_processing:
 #if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
         if( ssl->handshake->ecrs_enabled )
             rs_ctx = &ssl->handshake->ecrs_ctx.pk;
-#endif
+#endif /* MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED */
 
         if( ( ret = mbedtls_pk_verify_restartable( peer_pk,
                         md_alg, hash, hashlen, p, sig_len, rs_ctx ) ) != 0 )
         {
-            int send_alert_msg = 1;
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-            send_alert_msg = ( ret != MBEDTLS_ERR_ECP_IN_PROGRESS );
-#endif
-            if( send_alert_msg )
-                mbedtls_ssl_send_alert_message(
-                    ssl,
-                    MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                    MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR );
-            MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret );
 #if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
             if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
-                ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS;
-#endif
+            {
+                MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret );
+                return( MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS );
+            }
+#endif /* MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED */
+            mbedtls_ssl_send_alert_message(
+                ssl,
+                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+                MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR );
+            MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret );
             return( ret );
         }
 
diff --git a/library/ssl_ticket.c b/library/ssl_ticket.c
index e6abe850d..8a57789f1 100644
--- a/library/ssl_ticket.c
+++ b/library/ssl_ticket.c
@@ -148,16 +148,22 @@ int mbedtls_ssl_ticket_setup( mbedtls_ssl_ticket_context *ctx,
 
     int do_mbedtls_cipher_setup = 1;
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
-    do_mbedtls_cipher_setup = 0;
-
     ret = mbedtls_cipher_setup_psa( &ctx->keys[0].ctx,
                                     cipher_info, TICKET_AUTH_TAG_BYTES );
-    if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
-        return( ret );
-    /* We don't yet expect to support all ciphers through PSA,
-     * so allow fallback to ordinary mbedtls_cipher_setup(). */
-    if( ret == MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
-        do_mbedtls_cipher_setup = 1;
+
+    switch( ret )
+    {
+        case 0:
+            do_mbedtls_cipher_setup = 0;
+            break;
+        case MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE:
+            /* We don't yet expect to support all ciphers through PSA,
+             * so allow fallback to ordinary mbedtls_cipher_setup(). */
+            do_mbedtls_cipher_setup = 1;
+            break;
+        default:
+            return( ret );
+    }
 #endif /* MBEDTLS_USE_PSA_CRYPTO */
     if( do_mbedtls_cipher_setup )
         if( ( ret = mbedtls_cipher_setup( &ctx->keys[0].ctx, cipher_info ) )