[glib-networking: 88/129] Only initialize data_index once

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 0fab80ec648ef38e11856384c0b3f6ed802150fa
Author: Anders Skoglund <public andsk se>
Date:   Tue Dec 19 11:12:57 2017 +0100

    Only initialize data_index once
    
    Add a check so that g_tls_client_connection_openssl_initable_init only
    initialize the global data_index variable on the first call. If it is
    initialized multiple times it can cause an error in retrieve_certificate
    where it uses the index to retrieve stored data.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=791730

 tls/openssl/gtlsclientconnection-openssl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/tls/openssl/gtlsclientconnection-openssl.c b/tls/openssl/gtlsclientconnection-openssl.c
index 89c6f24..428cdf4 100644
--- a/tls/openssl/gtlsclientconnection-openssl.c
+++ b/tls/openssl/gtlsclientconnection-openssl.c
@@ -339,7 +339,7 @@ g_tls_client_connection_openssl_client_connection_interface_init (GTlsClientConn
   iface->copy_session_state = g_tls_client_connection_openssl_copy_session_state;
 }
 
-static int data_index;
+static int data_index = -1;
 
 static int
 retrieve_certificate (SSL       *ssl,
@@ -494,7 +494,9 @@ g_tls_client_connection_openssl_initable_init (GInitable       *initable,
       return FALSE;
     }
 
-  data_index = SSL_get_ex_new_index (0, (void *)"gtlsclientconnection", NULL, NULL, NULL);
+  if (data_index == -1) {
+      data_index = SSL_get_ex_new_index (0, (void *)"gtlsclientconnection", NULL, NULL, NULL);
+  }
   SSL_set_ex_data (priv->ssl, data_index, client);
 
 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME