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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6

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* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6:
  ecryptfs: dont call lookup_one_len to avoid NULL nameidata
  fs/ecryptfs/file.c: introduce missing free
  ecryptfs: release reference to lower mount if interpose fails
  eCryptfs: Handle ioctl calls with unlocked and compat functions
  ecryptfs: Fix warning in ecryptfs_process_response()
This commit is contained in:
Linus Torvalds 2010-08-10 12:14:39 -07:00
commit 26b55633a8
3 changed files with 118 additions and 38 deletions
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94
fs/ecryptfs/inode.c
View file

@ -264,7 +264,7 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
printk(KERN_ERR "%s: Out of memory whilst attempting "
"to allocate ecryptfs_dentry_info struct\n",
__func__);
goto out_dput;
goto out_put;
}
ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
@ -339,13 +339,84 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
out_free_kmem:
kmem_cache_free(ecryptfs_header_cache_2, page_virt);
goto out;
out_dput:
out_put:
dput(lower_dentry);
mntput(lower_mnt);
d_drop(ecryptfs_dentry);
out:
return rc;
}
/**
* ecryptfs_new_lower_dentry
* @ename: The name of the new dentry.
* @lower_dir_dentry: Parent directory of the new dentry.
* @nd: nameidata from last lookup.
*
* Create a new dentry or get it from lower parent dir.
*/
static struct dentry *
ecryptfs_new_lower_dentry(struct qstr *name, struct dentry *lower_dir_dentry,
struct nameidata *nd)
{
struct dentry *new_dentry;
struct dentry *tmp;
struct inode *lower_dir_inode;
lower_dir_inode = lower_dir_dentry->d_inode;
tmp = d_alloc(lower_dir_dentry, name);
if (!tmp)
return ERR_PTR(-ENOMEM);
mutex_lock(&lower_dir_inode->i_mutex);
new_dentry = lower_dir_inode->i_op->lookup(lower_dir_inode, tmp, nd);
mutex_unlock(&lower_dir_inode->i_mutex);
if (!new_dentry)
new_dentry = tmp;
else
dput(tmp);
return new_dentry;
}
/**
* ecryptfs_lookup_one_lower
* @ecryptfs_dentry: The eCryptfs dentry that we are looking up
* @lower_dir_dentry: lower parent directory
*
* Get the lower dentry from vfs. If lower dentry does not exist yet,
* create it.
*/
static struct dentry *
ecryptfs_lookup_one_lower(struct dentry *ecryptfs_dentry,
struct dentry *lower_dir_dentry)
{
struct nameidata nd;
struct vfsmount *lower_mnt;
struct qstr *name;
int err;
name = &ecryptfs_dentry->d_name;
lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
ecryptfs_dentry->d_parent));
err = vfs_path_lookup(lower_dir_dentry, lower_mnt, name->name , 0, &nd);
mntput(lower_mnt);
if (!err) {
/* we dont need the mount */
mntput(nd.path.mnt);
return nd.path.dentry;
}
if (err != -ENOENT)
return ERR_PTR(err);
/* create a new lower dentry */
return ecryptfs_new_lower_dentry(name, lower_dir_dentry, &nd);
}
/**
* ecryptfs_lookup
* @ecryptfs_dir_inode: The eCryptfs directory inode
@ -373,14 +444,12 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
goto out_d_drop;
}
lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
lower_dir_dentry,
ecryptfs_dentry->d_name.len);
mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
lower_dir_dentry);
if (IS_ERR(lower_dentry)) {
rc = PTR_ERR(lower_dentry);
ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned "
"[%d] on lower_dentry = [%s]\n", __func__, rc,
encrypted_and_encoded_name);
goto out_d_drop;
@ -402,14 +471,11 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
"filename; rc = [%d]\n", __func__, rc);
goto out_d_drop;
}
mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
lower_dentry = lookup_one_len(encrypted_and_encoded_name,
lower_dir_dentry,
encrypted_and_encoded_name_size - 1);
mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
lower_dir_dentry);
if (IS_ERR(lower_dentry)) {
rc = PTR_ERR(lower_dentry);
ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned "
"[%d] on lower_dentry = [%s]\n", __func__, rc,
encrypted_and_encoded_name);
goto out_d_drop;