From: Patrick Donnelly <pdonnell@redhat.com>
Date: Tue, 18 Apr 2017 02:33:19 +0000 (-0400)
Subject: mds: check projected parent to avoid unsafe access
X-Git-Tag: v12.0.3~38^2~27
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=26a08f31f7965afb062b027a4455620b52e7a67e;p=ceph.git

mds: check projected parent to avoid unsafe access

An anonymous inode may not have a stable parent so immediate migration would
cause a segfault when checking for strays.

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
---

diff --git a/src/mds/Migrator.cc b/src/mds/Migrator.cc
index f375c086ff09..4a508256fccf 100644
--- a/src/mds/Migrator.cc
+++ b/src/mds/Migrator.cc
@@ -781,7 +781,7 @@ void Migrator::export_dir(CDir *dir, mds_rank_t dest)
     return;
   }
 
-  if (!dir->inode->is_base() && dir->get_parent_dir()->get_inode()->is_stray() &&
+  if (!dir->inode->is_base() && dir->get_inode()->get_projected_parent_dir()->get_inode()->is_stray() &&
       dir->get_parent_dir()->get_parent_dir()->ino() != MDS_INO_MDSDIR(dest)) {
     dout(7) << "i won't export anything in stray" << dendl;
     return;