From: Sage Weil <sage@newdream.net>
Date: Wed, 3 Mar 2010 17:47:37 +0000 (-0800)
Subject: mds: fix null pointer deref in resolve on mostly-empty mds
X-Git-Tag: v0.20~357
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=0ee0a8d4654dbb14f67cb63be9d41eb7182961dd;p=ceph.git

mds: fix null pointer deref in resolve on mostly-empty mds

We may not have any dirfrags during resolve if the mds crashed
while stopping.
---

diff --git a/src/mds/MDCache.cc b/src/mds/MDCache.cc
index 129ffb76abee..6571dbdf37e4 100644
--- a/src/mds/MDCache.cc
+++ b/src/mds/MDCache.cc
@@ -2033,7 +2033,8 @@ void MDCache::resolve_start()
     // it owns, so that anything beyond its bounds get left as
     // unknown.
     CDir *rootdir = root->get_dirfrag(frag_t());
-    adjust_subtree_auth(rootdir, CDIR_AUTH_UNKNOWN);
+    if (rootdir)
+      adjust_subtree_auth(rootdir, CDIR_AUTH_UNKNOWN);
   }
 
   set<int> who;