From: Yan, Zheng <zyan@redhat.com>
Date: Mon, 25 May 2015 03:35:01 +0000 (+0800)
Subject: mds: fix use-after-free in SessionMap::remove_session
X-Git-Tag: v9.0.2~120^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=refs%2Fpull%2F4755%2Fhead;p=ceph.git

mds: fix use-after-free in SessionMap::remove_session

Fixes: #11752
Signed-off-by: Yan, Zheng <zyan@redhat.com>
---

diff --git a/src/mds/SessionMap.cc b/src/mds/SessionMap.cc
index cd45b35f1888..faaeb2669d65 100644
--- a/src/mds/SessionMap.cc
+++ b/src/mds/SessionMap.cc
@@ -584,11 +584,11 @@ void SessionMap::remove_session(Session *s)
   s->trim_completed_requests(0);
   s->item_session_list.remove_myself();
   session_map.erase(s->info.inst.name);
-  s->put();
   if (dirty_sessions.count(s->info.inst.name)) {
     dirty_sessions.erase(s->info.inst.name);
   }
   null_sessions.insert(s->info.inst.name);
+  s->put();
 }
 
 void SessionMap::touch_session(Session *session)