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

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

fs/ceph/dir.c

+2 −1
Original line number Diff line number Diff line
@@ -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;