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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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30
fs/ecryptfs/inode.c
View file

@ -74,16 +74,20 @@ ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
unsigned int flags_save;
int rc;
dentry_save = nd->path.dentry;
vfsmount_save = nd->path.mnt;
flags_save = nd->flags;
nd->path.dentry = lower_dentry;
nd->path.mnt = lower_mnt;
nd->flags &= ~LOOKUP_OPEN;
if (nd) {
dentry_save = nd->path.dentry;
vfsmount_save = nd->path.mnt;
flags_save = nd->flags;
nd->path.dentry = lower_dentry;
nd->path.mnt = lower_mnt;
nd->flags &= ~LOOKUP_OPEN;
}
rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
nd->path.dentry = dentry_save;
nd->path.mnt = vfsmount_save;
nd->flags = flags_save;
if (nd) {
nd->path.dentry = dentry_save;
nd->path.mnt = vfsmount_save;
nd->flags = flags_save;
}
return rc;
}
@ -241,8 +245,7 @@ out:
*/
int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
struct dentry *lower_dentry,
struct inode *ecryptfs_dir_inode,
struct nameidata *ecryptfs_nd)
struct inode *ecryptfs_dir_inode)
{
struct dentry *lower_dir_dentry;
struct vfsmount *lower_mnt;
@ -290,8 +293,6 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
goto out;
if (special_file(lower_inode->i_mode))
goto out;
if (!ecryptfs_nd)
goto out;
/* Released in this function */
page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
if (!page_virt) {
@ -417,8 +418,7 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
}
lookup_and_interpose:
rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
ecryptfs_dir_inode,
ecryptfs_nd);
ecryptfs_dir_inode);
goto out;
out_d_drop:
d_drop(ecryptfs_dentry);