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eCryptfs: Handle NULL nameidata pointers

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Allow for NULL nameidata pointers in eCryptfs create, lookup, and
d_revalidate functions.

Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
This commit is contained in:
Tyler Hicks 2011-02-17 17:35:20 -06:00
parent 8787c7a3e0
commit 70b8902199
3 changed files with 29 additions and 26 deletions
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22
fs/ecryptfs/dentry.c
View file

@ -46,24 +46,28 @@ static int ecryptfs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
{
struct dentry *lower_dentry;
struct vfsmount *lower_mnt;
struct dentry *dentry_save;
struct vfsmount *vfsmount_save;
struct dentry *dentry_save = NULL;
struct vfsmount *vfsmount_save = NULL;
int rc = 1;
if (nd->flags & LOOKUP_RCU)
if (nd && nd->flags & LOOKUP_RCU)
return -ECHILD;
lower_dentry = ecryptfs_dentry_to_lower(dentry);
lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
if (!lower_dentry->d_op || !lower_dentry->d_op->d_revalidate)
goto out;
dentry_save = nd->path.dentry;
vfsmount_save = nd->path.mnt;
nd->path.dentry = lower_dentry;
nd->path.mnt = lower_mnt;
if (nd) {
dentry_save = nd->path.dentry;
vfsmount_save = nd->path.mnt;
nd->path.dentry = lower_dentry;
nd->path.mnt = lower_mnt;
}
rc = lower_dentry->d_op->d_revalidate(lower_dentry, nd);
nd->path.dentry = dentry_save;
nd->path.mnt = vfsmount_save;
if (nd) {
nd->path.dentry = dentry_save;
nd->path.mnt = vfsmount_save;
}
if (dentry->d_inode) {
struct inode *lower_inode =
ecryptfs_inode_to_lower(dentry->d_inode);