From: Tejun Heo Date: Mon, 10 Feb 2014 22:57:09 +0000 (-0500) Subject: kernfs: fix hash calculation in kernfs_rename_ns() X-Git-Tag: next-20140306~25^2~15 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9561a8961c708ff6ba3e71a817af0f16bdc1d885;p=karo-tx-linux.git kernfs: fix hash calculation in kernfs_rename_ns() 3eef34ad7dc3 ("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 Reported-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c index a347792c2e5a..a0f99b7f84b2 100644 --- a/fs/kernfs/dir.c +++ b/fs/kernfs/dir.c @@ -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);