cachefiles: use path_get instead of lone dget
Dentry references should not be acquired without a corresponding
vfsmount ref.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
index 24eb0d3..72d4d00 100644
--- a/fs/cachefiles/daemon.c
+++ b/fs/cachefiles/daemon.c
@@ -553,7 +553,7 @@
static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args)
{
struct fs_struct *fs;
- struct dentry *dir;
+ struct path path;
const struct cred *saved_cred;
int ret;
@@ -575,22 +575,23 @@
/* extract the directory dentry from the cwd */
fs = current->fs;
read_lock(&fs->lock);
- dir = dget(fs->pwd.dentry);
+ path = fs->pwd;
+ path_get(&path);
read_unlock(&fs->lock);
- if (!S_ISDIR(dir->d_inode->i_mode))
+ if (!S_ISDIR(path.dentry->d_inode->i_mode))
goto notdir;
cachefiles_begin_secure(cache, &saved_cred);
- ret = cachefiles_cull(cache, dir, args);
+ ret = cachefiles_cull(cache, path.dentry, args);
cachefiles_end_secure(cache, saved_cred);
- dput(dir);
+ path_put(&path);
_leave(" = %d", ret);
return ret;
notdir:
- dput(dir);
+ path_put(&path);
kerror("cull command requires dirfd to be a directory");
return -ENOTDIR;
@@ -629,7 +630,7 @@
static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)
{
struct fs_struct *fs;
- struct dentry *dir;
+ struct path path;
const struct cred *saved_cred;
int ret;
@@ -651,22 +652,23 @@
/* extract the directory dentry from the cwd */
fs = current->fs;
read_lock(&fs->lock);
- dir = dget(fs->pwd.dentry);
+ path = fs->pwd;
+ path_get(&path);
read_unlock(&fs->lock);
- if (!S_ISDIR(dir->d_inode->i_mode))
+ if (!S_ISDIR(path.dentry->d_inode->i_mode))
goto notdir;
cachefiles_begin_secure(cache, &saved_cred);
- ret = cachefiles_check_in_use(cache, dir, args);
+ ret = cachefiles_check_in_use(cache, path.dentry, args);
cachefiles_end_secure(cache, saved_cred);
- dput(dir);
+ path_put(&path);
//_leave(" = %d", ret);
return ret;
notdir:
- dput(dir);
+ path_put(&path);
kerror("inuse command requires dirfd to be a directory");
return -ENOTDIR;