Check and invalidate handles on free.

diff --git a/libfreerdp/core/nla.c b/libfreerdp/core/nla.c
index e3e1899..b41531a 100644 (file)
--- a/libfreerdp/core/nla.c
+++ b/libfreerdp/core/nla.c
@@ -507,8 +507,11 @@ static int nla_client_recv(rdpNla* nla)
                }
 
                nla_buffer_free(nla);
-               nla->table->FreeCredentialsHandle(&nla->credentials);
-
+               if (SecIsValidHandle(&nla->credentials))
+               {
+                       nla->table->FreeCredentialsHandle(&nla->credentials);
+                       SecInvalidateHandle(&nla->credentials);
+               }
                if (nla->status != SEC_E_OK)
                {
                        WLog_ERR(TAG, "FreeCredentialsHandle status %s [0x%08"PRIX32"]",
@@ -1853,7 +1856,11 @@ void nla_free(rdpNla* nla)
        if (nla->table)
        {
                SECURITY_STATUS status;
-               status = nla->table->FreeCredentialsHandle(&nla->credentials);
+               if (SecIsValidHandle(&nla->credentials))
+               {
+                       status = nla->table->FreeCredentialsHandle(&nla->credentials);
+                       SecInvalidateHandle(&nla->credentials);
+               }
 
                status = nla->table->DeleteSecurityContext(&nla->context);