File libxl.prepare-environment-for-domcreate_stream_done.patch of Package xen.12877

From: Olaf Hering <olaf@aepfle.de>
Date: Thu, 7 Mar 2019 11:51:51 +0100
Subject: libxl: prepare environment for domcreate_stream_done
References: bsc#1126325

The function domcreate_bootloader_done may branch early to
domcreate_stream_done, in case some error occoured. Here srs->dcs will be
NULL, which leads to a crash.

It is unclear what the purpose of that backpointer is. Perhaps it can be
removed, and domcreate_stream_done could use CONTAINER_OF.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
---
 tools/libxl/libxl_create.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: xen-4.10.3-testing/tools/libxl/libxl_create.c
===================================================================
--- xen-4.10.3-testing.orig/tools/libxl/libxl_create.c
+++ xen-4.10.3-testing/tools/libxl/libxl_create.c
@@ -1106,6 +1106,10 @@ static void domcreate_bootloader_done(li
         return;
     }
 
+    /* Prepare environment for domcreate_stream_done */
+    if (!dcs->srs.dcs)
+        dcs->srs.dcs = dcs;
+
     /* Restore */
     callbacks->restore_results = libxl__srm_callout_callback_restore_results;
 
@@ -1130,7 +1134,6 @@ static void domcreate_bootloader_done(li
         goto out;
 
     dcs->srs.ao = ao;
-    dcs->srs.dcs = dcs;
     dcs->srs.fd = restore_fd;
     dcs->srs.legacy = (dcs->restore_params.stream_version == 1);
     dcs->srs.back_channel = false;