Commit 92cf7652 authored by Sage Weil's avatar Sage Weil

ceph: fix null pointer dereference in ceph_init_dentry for nfs reexport

The fh_to_dentry etc. methods use ceph_init_dentry(), which assumes that
d_parent is defined.  It isn't for those callers, so check!
Signed-off-by: default avatarSage Weil <sage@newdream.net>
parent ab226e21
......@@ -40,7 +40,8 @@ int ceph_init_dentry(struct dentry *dentry)
if (dentry->d_fsdata)
return 0;
if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
if (dentry->d_parent == NULL || /* nfs fh_to_dentry */
ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
dentry->d_op = &ceph_dentry_ops;
else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
dentry->d_op = &ceph_snapdir_dentry_ops;
......
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