[Qemu-block] [PATCH V2 RESEND] block/replication.c: Fix crash issue after failover

[Zhang Chen]

From: Zhang Chen <address@hidden>

If we try to close replication after failover, it will crash here.
So we need check the block job on active disk before cancel the job.

Signed-off-by: Zhang Chen <address@hidden>
---
 block/replication.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/block/replication.c b/block/replication.c
index b41bc507c0..a68bc7e986 100644
--- a/block/replication.c
+++ b/block/replication.c
@@ -149,7 +149,9 @@ static void replication_close(BlockDriverState *bs)
         replication_stop(s->rs, false, NULL);
     }
     if (s->stage == BLOCK_REPLICATION_FAILOVER) {
-        job_cancel_sync(&s->commit_job->job);
+        if (s->commit_job) {
+            job_cancel_sync(&s->commit_job->job);
+        }
     }
 
     if (s->mode == REPLICATION_MODE_SECONDARY) {
-- 
2.17.GIT