WSL2-Linux-Kernel/fs/kernfs
Tejun Heo 4afddd60a7 kernfs: protect lazy kernfs_iattrs allocation with mutex
kernfs_iattrs is allocated lazily when operations which require it
take place; unfortunately, the lazy allocation and returning weren't
properly synchronized and when there are multiple concurrent
operations, it might end up returning kernfs_iattrs which hasn't
finished initialization yet or different copies to different callers.

Fix it by synchronizing with a mutex.  This can be smarter with memory
barriers but let's go there if it actually turns out to be necessary.

Signed-off-by: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/g/533ABA32.9080602@oracle.com
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Cc: stable@vger.kernel.org # 3.14
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-04-16 11:54:40 -07:00
..
Kconfig kernfs: add CONFIG_KERNFS 2014-02-07 16:08:57 -08:00
Makefile sysfs, kernfs: add skeletons for kernfs 2013-11-27 13:28:24 -08:00
dir.c Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2014-04-03 13:05:42 -07:00
file.c kernfs: cache atomic_write_len in kernfs_open_file 2014-03-08 22:08:29 -08:00
inode.c kernfs: protect lazy kernfs_iattrs allocation with mutex 2014-04-16 11:54:40 -07:00
kernfs-internal.h kernfs: fix kernfs_node_from_dentry() 2014-02-14 14:31:37 -08:00
mount.c Merge 3.14-rc5 into driver-core-next 2014-03-02 20:09:08 -08:00
symlink.c kernfs: remove kernfs_addrm_cxt 2014-02-07 15:42:40 -08:00