diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index c864cb2..234098a 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -837,13 +837,14 @@
         {
             /*
              * Note: we shall never arrive here as protection profiles
-             * is checked by ssl_set_dtls_srtp_protection_profiles function
+             * is checked by mbedtls_ssl_conf_dtls_srtp_protection_profiles function
              */
             MBEDTLS_SSL_DEBUG_MSG( 3,
                     ( "client hello, "
-                      "ignore illegal DTLS-SRTP protection profile %d",
+                      "illegal DTLS-SRTP protection profile %d",
                       ssl->conf->dtls_srtp_profile_list[protection_profiles_index]
                     ) );
+            return( MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED );
         }
     }
 
@@ -1872,11 +1873,12 @@
     }
 
     /*
-     * Length is 5 and optional mki_value : one protection profile(2 bytes)
-     *                                      + length(2 bytes) + mki_len(1 byte)
+     * Length is 5 + optional mki_value : one protection profile length (2 bytes)
+     *                                      + protection profile (2 bytes)
+     *                                      + mki_len(1 byte)
      *                                      and optional srtp_mki
      */
-    if( ( len != 5 ) && ( len != ( 5 + mki_len ) ) )
+    if( len != ( buf[4] + 5u ) )
         return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
 
     /*
@@ -2509,8 +2511,11 @@
         case MBEDTLS_TLS_EXT_ALPN:
             MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) );
 
-            if( ( ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size ) ) != 0 )
-                return( ret );
+            if ( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+            {
+                if( ( ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size ) ) != 0 )
+                    return( ret );
+            }
 
             break;
 #endif /* MBEDTLS_SSL_ALPN */
diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index 5c56a70..007d9e4 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -810,8 +810,9 @@
      * Min length is 5: at least one protection profile(2 bytes)
      *                  and length(2 bytes) + srtp_mki length(1 byte)
      * Check here that we have at least 2 bytes of protection profiles length
+     * and one of srtp_mki length
      */
-    if( len < 2 )
+    if( len < size_of_lengths )
     {
         mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
                                         MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
@@ -824,8 +825,8 @@
     profile_length = ( buf[0] << 8 ) | buf[1];
     buf += 2;
 
-    /* check the buffer size: at least profiles + profile and mki length */
-    if( profile_length + size_of_lengths > len ||
+    /* The profile length cannot be bigger than input buffer size - lengths fields */
+    if( profile_length > len - size_of_lengths ||
         profile_length % 2 != 0 ) /* profiles are 2 bytes long, so the length must be even */
     {
         mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
@@ -836,9 +837,9 @@
      * parse the extension list values are defined in
      * http://www.iana.org/assignments/srtp-protection/srtp-protection.xhtml
      */
-    for( j=0; j < profile_length; j += 2 )
+    for( j = 0; j < profile_length; j += 2 )
     {
-        uint16_t protection_profile_value = buf[j] << 8 | buf[j+1];
+        uint16_t protection_profile_value = buf[j] << 8 | buf[j + 1];
         client_protection = mbedtls_ssl_check_srtp_profile_value( protection_profile_value );
 
         if( client_protection != MBEDTLS_TLS_SRTP_UNSET )
@@ -884,10 +885,7 @@
     {
         ssl->dtls_srtp_info.mki_len = mki_length;
 
-        for( i=0; i < mki_length; i++ )
-        {
-            ssl->dtls_srtp_info.mki_value[i] = buf[i];
-        }
+        memcpy(ssl->dtls_srtp_info.mki_value, buf, mki_length);
 
         MBEDTLS_SSL_DEBUG_BUF( 3, "using mki",  ssl->dtls_srtp_info.mki_value,
                                                 ssl->dtls_srtp_info.mki_len );
@@ -2067,9 +2065,12 @@
             case MBEDTLS_TLS_EXT_USE_SRTP:
                 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found use_srtp extension" ) );
 
-                ret = ssl_parse_use_srtp_ext( ssl, ext + 4, ext_size );
-                if ( ret != 0 )
-                    return( ret );
+                if ( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+                {
+                    ret = ssl_parse_use_srtp_ext( ssl, ext + 4, ext_size );
+                    if ( ret != 0 )
+                        return( ret );
+                }
                 break;
 #endif /* MBEDTLS_SSL_DTLS_SRTP */
 
@@ -2991,8 +2992,11 @@
 #endif
 
 #if defined(MBEDTLS_SSL_DTLS_SRTP)
-    ssl_write_use_srtp_ext( ssl, p + 2 + ext_len, &olen );
-    ext_len += olen;
+    if ( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+    {
+        ssl_write_use_srtp_ext( ssl, p + 2 + ext_len, &olen );
+        ext_len += olen;
+    }
 #endif
 
     MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, total extension length: %d", ext_len ) );
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 58fcab3..a9e5523 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -4727,16 +4727,14 @@
                        list_size <= MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH;
          p++ )
     {
-        switch( *p )
+        if ( mbedtls_ssl_check_srtp_profile_value( *p ) != MBEDTLS_TLS_SRTP_UNSET )
         {
-            case MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_80:
-            case MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_32:
-            case MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_80:
-            case MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_32:
-                list_size++;
-                break;
-            default: /* unsupported value, stop parsing and set the size to an error value */
-                list_size = MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH + 1;
+            list_size++;
+        }
+        else
+        {
+            /* unsupported value, stop parsing and set the size to an error value */
+            list_size = MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH + 1;
         }
     }