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kernfs: fix hash calculation in kernfs_rename_ns() 

3eef34ad7d ("kernfs: implement kernfs_get_parent(),
kernfs_name/path() and friends") restructured kernfs_rename_ns() such
that new name assignment happens under kernfs_rename_lock;
unfortunately, it mistakenly passed NULL to kernfs_name_hash() to
calculate the new hash if the name hasn't changed, which can lead to
oops.

Fix it by using kn->name and kn->ns when calculating the new hash.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Dan Carpenter dan.carpenter@oracle.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2014-02-10 17:57:09 -05:00 committed by Greg Kroah-Hartman
parent ba341d55a4
commit 9561a8961c
1 changed files with 1 additions and 1 deletions
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2
fs/kernfs/dir.c
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@ -1295,7 +1295,7 @@ int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent,
spin_unlock_irq(&kernfs_rename_lock);
kn->hash = kernfs_name_hash(new_name, new_ns);
kn->hash = kernfs_name_hash(kn->name, kn->ns);
kernfs_link_sibling(kn);
kernfs_put(old_parent);