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ceph: fix null pointer dereference in ceph_init_dentry for nfs reexport

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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: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil
2010-12-17 09:53:41 -08:00
parent ab226e21ad
commit 92cf765237
1 changed files with 2 additions and 1 deletions
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fs/ceph/dir.c
+2 -1
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@@ -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;