obexd/client: Fix crash while disconnecting

In case the transport is disconnected while disconnect command is pending
the session is freed on disconnect_complete but disconnect callback is
still valid causing the following crash:

Invalid read of size 4
   at 0x42682A: obc_session_ref (session.c:132)
   by 0x42797B: obc_session_shutdown (session.c:580)
   by 0x4139DA: incoming_data (gobex.c:1406)
   by 0x59712A5: g_main_context_dispatch (in /usr/lib64/libglib-2.0.so.0.3800.2)
   by 0x5971627: ??? (in /usr/lib64/libglib-2.0.so.0.3800.2)
   by 0x5971A39: g_main_loop_run (in /usr/lib64/libglib-2.0.so.0.3800.2)
   by 0x40D78C: main (main.c:320)
 Address 0x728d814 is 4 bytes inside a block of size 120 free'd
   at 0x4C28577: free (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
   by 0x5976F7E: g_free (in /usr/lib64/libglib-2.0.so.0.3800.2)
   by 0x4134B9: handle_response (gobex.c:1129)
   by 0x4139BD: incoming_data (gobex.c:1403)
   by 0x59712A5: g_main_context_dispatch (in /usr/lib64/libglib-2.0.so.0.3800.2)
   by 0x5971627: ??? (in /usr/lib64/libglib-2.0.so.0.3800.2)
   by 0x5971A39: g_main_loop_run (in /usr/lib64/libglib-2.0.so.0.3800.2)
   by 0x40D78C: main (main.c:320)

diff --git a/obexd/client/session.c b/obexd/client/session.c
index cb176e4..9bba6c6 100644 (file)
--- a/obexd/client/session.c
+++ b/obexd/client/session.c
@@ -225,8 +225,10 @@ static void session_free(struct obc_session *session)
        if (session->watch)
                g_dbus_remove_watch(session->conn, session->watch);
 
-       if (session->obex != NULL)
+       if (session->obex) {
+               g_obex_set_disconnect_function(session->obex, NULL, NULL);
                g_obex_unref(session->obex);
+       }
 
        if (session->id > 0 && session->transport != NULL)
                session->transport->disconnect(session->id);