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[3/5] ceph: fix null pointer dereference in ceph_init_dentry for nfs reexport

Message ID 1292872531-18396-4-git-send-email-sage@newdream.net (mailing list archive)
State New, archived
Headers show

Commit Message

Sage Weil Dec. 20, 2010, 7:15 p.m. UTC 
None
diff mbox

Patch

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 158c700..d902948 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -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;