[PULL 7/9] migration/colo: fix use after free of local_err

["Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>]

From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

local_err is used again in secondary_vm_do_failover() after
replication_stop_all(), so we must zero it. Otherwise try to set
non-NULL local_err will crash.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20200324153630.11882-5-vsementsov@virtuozzo.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 migration/colo.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/migration/colo.c b/migration/colo.c
index 44942c4e23..a54ac84f41 100644
--- a/migration/colo.c
+++ b/migration/colo.c
@@ -93,6 +93,7 @@ static void secondary_vm_do_failover(void)
     replication_stop_all(true, &local_err);
     if (local_err) {
         error_report_err(local_err);
+        local_err = NULL;
     }
 
     /* Notify all filters of all NIC to do checkpoint */
-- 
2.25.1