diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 734bc8f..bed4286 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -3350,6 +3350,9 @@
     if( ssl->hostname_len + 1 == 0 )
         return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
 
+    if( ssl->hostname_len > SSL_MAX_HOST_NAME_LEN )
+        return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+
     ssl->hostname = (unsigned char *) malloc( ssl->hostname_len + 1 );
 
     if( ssl->hostname == NULL )