From 996b73764e9bb9d5e751fd15b130ba38637d66a8 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Thu, 14 Jun 2007 03:45:14 +0900 Subject: [PATCH] sysfs: flatten and fix sysfs_rename_dir() error handling Error handling in sysfs_rename_dir() was broken. * When lookup_one_len() fails, 0 is returned. * If parent inode check fails, returns with inode mutex and rename rwsem held. This patch fixes the above bugs and flattens error handling such that it's more readable and easier to modify. Signed-off-by: Tejun Heo Signed-off-by: Greg Kroah-Hartman --- fs/sysfs/dir.c | 73 ++++++++++++++++++++++++++++---------------------- 1 file changed, 41 insertions(+), 32 deletions(-) diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index b4c482461403..90bed5df254f 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -452,8 +452,9 @@ void sysfs_remove_dir(struct kobject * kobj) int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent, const char *new_name) { - int error = 0; + int error; struct dentry * new_dentry; + struct sysfs_dirent *sd, *parent_sd; if (!new_parent) return -EFAULT; @@ -462,40 +463,48 @@ int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent, mutex_lock(&new_parent->d_inode->i_mutex); new_dentry = lookup_one_len(new_name, new_parent, strlen(new_name)); - if (!IS_ERR(new_dentry)) { - /* By allowing two different directories with the - * same d_parent we allow this routine to move - * between different shadows of the same directory - */ - if (kobj->dentry->d_parent->d_inode != new_parent->d_inode) - return -EINVAL; - else if (new_dentry->d_parent->d_inode != new_parent->d_inode) - error = -EINVAL; - else if (new_dentry == kobj->dentry) - error = -EINVAL; - else if (!new_dentry->d_inode) { - error = kobject_set_name(kobj, "%s", new_name); - if (!error) { - struct sysfs_dirent *sd, *parent_sd; - - d_add(new_dentry, NULL); - d_move(kobj->dentry, new_dentry); - - sd = kobj->dentry->d_fsdata; - parent_sd = new_parent->d_fsdata; - - list_del_init(&sd->s_sibling); - list_add(&sd->s_sibling, &parent_sd->s_children); - } - else - d_drop(new_dentry); - } else - error = -EEXIST; - dput(new_dentry); + if (IS_ERR(new_dentry)) { + error = PTR_ERR(new_dentry); + goto out_unlock; } + + /* By allowing two different directories with the same + * d_parent we allow this routine to move between different + * shadows of the same directory + */ + error = -EINVAL; + if (kobj->dentry->d_parent->d_inode != new_parent->d_inode || + new_dentry->d_parent->d_inode != new_parent->d_inode || + new_dentry == kobj->dentry) + goto out_dput; + + error = -EEXIST; + if (new_dentry->d_inode) + goto out_dput; + + error = kobject_set_name(kobj, "%s", new_name); + if (error) + goto out_drop; + + d_add(new_dentry, NULL); + d_move(kobj->dentry, new_dentry); + + sd = kobj->dentry->d_fsdata; + parent_sd = new_parent->d_fsdata; + + list_del_init(&sd->s_sibling); + list_add(&sd->s_sibling, &parent_sd->s_children); + + error = 0; + goto out_unlock; + + out_drop: + d_drop(new_dentry); + out_dput: + dput(new_dentry); + out_unlock: mutex_unlock(&new_parent->d_inode->i_mutex); up_write(&sysfs_rename_sem); - return error; } -- 2.20.1