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sysfs: fix bugs in sysfs_rename/move_dir()

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sysfs_rename/move_dir() have the following bugs.

 - On dentry lookup failure, kfree() is called on ERR_PTR() value.
 - sysfs_move_dir() has an extra dput() on success path.

Fix them.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tejun Heo 2008-01-16 12:10:53 +09:00 committed by Linus Torvalds
parent e49452c677
commit 456ef1553c
1 changed files with 3 additions and 1 deletions
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4
fs/sysfs/dir.c
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@ -783,6 +783,7 @@ int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
old_dentry = sysfs_get_dentry(sd);
if (IS_ERR(old_dentry)) {
error = PTR_ERR(old_dentry);
old_dentry = NULL;
goto out;
}
@ -850,6 +851,7 @@ int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj)
old_dentry = sysfs_get_dentry(sd);
if (IS_ERR(old_dentry)) {
error = PTR_ERR(old_dentry);
old_dentry = NULL;
goto out;
}
old_parent = old_dentry->d_parent;
@ -857,6 +859,7 @@ int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj)
new_parent = sysfs_get_dentry(new_parent_sd);
if (IS_ERR(new_parent)) {
error = PTR_ERR(new_parent);
new_parent = NULL;
goto out;
}
@ -880,7 +883,6 @@ again:
error = 0;
d_add(new_dentry, NULL);
d_move(old_dentry, new_dentry);
dput(new_dentry);
/* Remove from old parent's list and insert into new parent's list. */
sysfs_unlink_sibling(sd);