[libvirt] [PATCH] [PATCH] rpc: fix keep alive timer segfault

[Yi Wang]

ka maybe have been freeed in virObjectUnref, application using
virKeepAliveTimer will segfault when unlock ka. We should keep
ka's refs positive before using it.

Signed-off-by: Yi Wang <wang.yi59 at zte.com.cn>
---
 src/rpc/virkeepalive.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/src/rpc/virkeepalive.c b/src/rpc/virkeepalive.c
index c9faf88..4f666fd 100644
--- a/src/rpc/virkeepalive.c
+++ b/src/rpc/virkeepalive.c
@@ -160,17 +160,17 @@ virKeepAliveTimer(int timer ATTRIBUTE_UNUSED, void *opaque)
     bool dead;
     void *client;
 
+    virObjectRef(ka);
     virObjectLock(ka);
 
     client = ka->client;
     dead = virKeepAliveTimerInternal(ka, &msg);
 
+    virObjectUnlock(ka);
+
     if (!dead && !msg)
         goto cleanup;
 
-    virObjectRef(ka);
-    virObjectUnlock(ka);
-
     if (dead) {
         ka->deadCB(client);
     } else if (ka->sendCB(client, msg) < 0) {
@@ -178,11 +178,8 @@ virKeepAliveTimer(int timer ATTRIBUTE_UNUSED, void *opaque)
         virNetMessageFree(msg);
     }
 
-    virObjectLock(ka);
-    virObjectUnref(ka);
-
  cleanup:
-    virObjectUnlock(ka);
+    virObjectUnref(ka);
 }
 
 
-- 
1.8.3.1