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Miklos Szeredi b854cc659d ovl: avoid deadlock on directory ioctl 
The function ovl_dir_real_file() currently uses the inode lock to serialize
writes to the od->upperfile field.

However, this function will get called by ovl_ioctl_set_flags(), which
utilizes the inode lock too.  In this case ovl_dir_real_file() will try to
claim a lock that is owned by a function in its call stack, which won't get
released before ovl_dir_real_file() returns.

Fix by replacing the open coded compare and exchange by an explicit atomic
op.

Fixes: 61536bed2149 ("ovl: support [S|G]ETFLAGS and FS[S|G]ETXATTR ioctls for directories")
Cc: stable@vger.kernel.org # v5.10
Reported-by: Icenowy Zheng <icenowy@aosc.io>
Tested-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2021-01-28 10:22:48 +01:00
..
9p
9p for 5.11-rc1
2020-12-21 10:28:02 -08:00
adfs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
affs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
afs
afs: Fix directory entry size calculation
2021-01-04 12:25:19 +00:00
autofs
file: Replace ksys_close with close_fd
2020-12-10 12:42:59 -06:00
befs
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
bfs
bfs: don't use WARNING: string when it's just info.
2020-12-15 22:46:18 -08:00
btrfs
for-5.11-rc3-tag
2021-01-11 14:18:56 -08:00
cachefiles
cachefiles: Handle readpage error correctly
2020-10-26 10:42:54 -07:00
ceph
ceph: reencode gid_list when reconnecting
2020-12-28 20:34:32 +01:00
cifs
cifs: style: replace one-element array with flexible-array
2021-01-13 13:36:45 -06:00
coda
docs: filesystems: convert coda.txt to ReST
2020-05-05 09:22:21 -06:00
configfs
configfs: fix kernel-doc markup issue
2020-11-14 10:22:45 +01:00
cramfs
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
crypto
f2fs-for-5.11-rc1
2020-12-17 11:18:00 -08:00
debugfs
debugfs: remove return value of debugfs_create_devm_seqfile()
2020-10-30 08:37:39 +01:00
devpts
…
dlm
fs: dlm: check on existing node address
2020-11-10 12:14:20 -06:00
ecryptfs
mm, treewide: rename kzfree() to kfree_sensitive()
2020-08-07 11:33:22 -07:00
efivarfs
efivarfs: revert "fix memory leak in efivarfs_create()"
2020-11-25 16:55:02 +01:00
efs
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
erofs
erofs: avoid using generic_block_bmap
2020-12-10 11:07:40 +08:00
exfat
exfat: Avoid allocating upcase table using kcalloc()
2020-12-22 12:31:17 +09:00
exportfs
exportfs: Add a function to return the raw output from fh_to_dentry()
2020-12-09 09:39:38 -05:00
ext2
ext2: Fix fall-through warnings for Clang
2020-11-23 10:36:53 +01:00
ext4
A number of bug fixes for ext4:
2021-01-15 14:54:24 -08:00
f2fs
f2fs-for-5.11-rc1
2020-12-17 11:18:00 -08:00
fat
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
freevxfs
…
fscache
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2020-06-03 16:27:18 -07:00
fuse
fuse: fix bad inode
2020-12-10 15:33:14 +01:00
gfs2
gfs2: in signal_our_withdraw wait for unfreeze of _this_ fs only
2020-12-03 17:04:41 +01:00
hfs
fs: Replace zero-length array with flexible-array member
2020-10-29 17:22:59 -05:00
hfsplus
fs: Replace zero-length array with flexible-array member
2020-10-29 17:22:59 -05:00
hostfs
fix hostfs_open() use of ->f_path.dentry
2020-12-21 21:42:29 -05:00
hpfs
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
hugetlbfs
hugetlbfs: prevent filesystem stacking of hugetlbfs
2020-08-12 10:57:56 -07:00
iomap
mm: memcontrol: Use helpers to read page's memcg data
2020-12-02 18:28:05 -08:00
isofs
fs: Replace zero-length array with flexible-array member
2020-10-29 17:22:59 -05:00
jbd2
jbd2: add a helper to find out number of fast commit blocks
2020-12-17 13:30:45 -05:00
jffs2
jffs2: Fix NULL pointer dereference in rp_size fs option parsing
2020-12-13 21:57:21 +01:00
jfs
jfs: Fix array index bounds check in dbAdjTree
2020-11-13 16:03:07 -06:00
kernfs
fs/kernfs: remove the double check of dentry->inode
2020-12-09 19:03:49 +01:00
lockd
fs/lockd: convert comma to semicolon
2020-12-16 07:57:37 -05:00
minix
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
nfs
NFS: nfs_igrab_and_active must first reference the superblock
2021-01-10 16:29:28 -05:00
nfs_common
nfs_common: need lock during iterate through the list
2020-12-09 09:38:34 -05:00
nfsd
Fixes:
2021-01-11 11:35:46 -08:00
nilfs2
fs/nilfs2: remove some unused macros to tame gcc
2020-12-15 22:46:17 -08:00
nls
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
notify
fanotify: Fix sys_fanotify_mark() on native x86-32
2020-12-28 11:58:59 +01:00
ntfs
fs/ntfs: remove unused variable attr_len
2020-12-15 12:13:37 -08:00
ocfs2
ocfs2: ratelimit the 'max lookup times reached' notice
2020-12-15 12:13:37 -08:00
omfs
fs: omfs: use kmemdup() rather than kmalloc+memcpy
2020-09-22 23:39:45 -04:00
openpromfs
…
orangefs
orangefs: add splice file operations
2020-12-16 16:14:08 -05:00
overlayfs
ovl: avoid deadlock on directory ioctl
2021-01-28 10:22:48 +01:00
proc
mm: don't play games with pinned pages in clear_page_refs
2021-01-16 10:51:26 -08:00
pstore
Tracing updates for 5.11
2020-12-17 13:22:17 -08:00
qnx4
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
qnx6
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
quota
\n
2020-12-17 11:00:37 -08:00
ramfs
ramfs: fix nommu mmap with gaps in the page cache
2020-10-16 11:11:22 -07:00
reiserfs
reiserfs: add check for an invalid ih_entry_count
2020-11-26 16:57:28 +01:00
romfs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
squashfs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
sysfs
sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output
2020-10-02 12:02:30 +02:00
sysv
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
tracefs
…
ubifs
This pull request contains changes for JFFS2, UBI and UBIFS:
2020-12-17 17:46:34 -08:00
udf
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
ufs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
unicode
unicode: Add utf8_casefold_hash
2020-09-10 14:03:31 -07:00
vboxsf
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2020-10-15 15:11:56 -07:00
verity
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
2020-12-14 12:18:19 -08:00
xfs
New code for 5.11:
2020-12-18 12:50:18 -08:00
zonefs
zonefs: select CONFIG_CRC32
2021-01-04 09:06:42 +09:00
aio.c
Merge branch 'akpm' (patches from Andrew)
2020-12-15 12:53:37 -08:00
anon_inodes.c
…
attr.c
…
bad_inode.c
fs: move the fiemap definitions out of fs.h
2020-06-03 23:16:55 -04:00
binfmt_aout.c
exec: Rename flush_old_exec begin_new_exec
2020-05-07 16:55:47 -05:00
binfmt_elf_fdpic.c
binfmt_elf, binfmt_elf_fdpic: use a VMA list snapshot
2020-10-16 11:11:21 -07:00
binfmt_elf.c
Merge branch 'exec-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:29:43 -08:00
binfmt_em86.c
Merge branch 'akpm' (patches from Andrew)
2020-06-04 19:18:29 -07:00
binfmt_flat.c
binfmt_flat: revert "binfmt_flat: don't offset the data start"
2020-08-24 08:49:13 +10:00
binfmt_misc.c
Merge branch 'akpm' (patches from Andrew)
2020-06-04 19:18:29 -07:00
binfmt_script.c
Merge branch 'akpm' (patches from Andrew)
2020-06-04 19:18:29 -07:00
block_dev.c
block: pre-initialize struct block_device in bdev_alloc_inode
2021-01-07 20:57:53 -07:00
buffer.c
for-5.11/block-2020-12-14
2020-12-16 12:57:51 -08:00
char_dev.c
vfs: allow unprivileged whiteout creation
2020-05-14 16:44:23 +02:00
compat_binfmt_elf.c
elf: Expose ELF header on arch_setup_additional_pages()
2020-10-26 13:46:47 +01:00
coredump.c
Merge branch 'exec-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:29:43 -08:00
d_path.c
fs: fix NULL dereference due to data race in prepend_path()
2020-10-14 14:54:45 -07:00
dax.c
mm: simplify follow_pte{,pmd}
2020-12-15 22:46:19 -08:00
dcache.c
fs: Kill DCACHE_DONTCACHE dentry even if DCACHE_REFERENCED is set
2020-12-10 17:33:17 -05:00
dcookies.c
…
direct-io.c
\n
2020-10-15 15:03:10 -07:00
drop_caches.c
sysctl: pass kernel pointers to ->proc_handler
2020-04-27 02:07:40 -04:00
eventfd.c
eventfd: Export eventfd_ctx_do_read()
2020-11-15 09:49:10 -05:00
eventpoll.c
epoll: add syscall epoll_pwait2
2020-12-19 11:18:38 -08:00
exec.c
Merge branch 'parisc-5.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
2020-12-16 12:10:40 -08:00
fcntl.c
fcntl: Fix potential deadlock in send_sig{io, urg}()
2020-11-05 07:44:15 -05:00
fhandle.c
…
file_table.c
epoll: take epitem list out of struct file
2020-10-25 20:02:08 -04:00
file.c
kernel/io_uring: cancel io_uring before task works
2020-12-30 19:36:54 -07:00
filesystems.c
fs/filesystems.c: downgrade user-reachable WARN_ONCE() to pr_warn_once()
2020-04-10 15:36:22 -07:00
fs_context.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
fs_parser.c
fs_parse: mark fs_param_bad_value() as static
2020-10-13 18:38:27 -07:00
fs_pin.c
…
fs_struct.c
vfs: Use sequence counter with associated spinlock
2020-07-29 16:14:27 +02:00
fs_types.c
…
fs-writeback.c
writeback: don't warn on an unregistered BDI in __mark_inode_dirty
2020-12-16 11:56:02 +01:00
fsopen.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
init.c
init: add an init_dup helper
2020-08-04 21:02:38 -04:00
inode.c
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-12-25 10:54:29 -08:00
internal.h
for-5.11/block-2020-12-14
2020-12-16 12:57:51 -08:00
io_uring.c
io_uring: ensure finish_wait() is always called in __io_uring_task_cancel()
2021-01-15 16:04:23 -07:00
io-wq.c
io-wq: kill now unused io_wq_cancel_all()
2020-12-20 10:47:42 -07:00
io-wq.h
io-wq: kill now unused io_wq_cancel_all()
2020-12-20 10:47:42 -07:00
ioctl.c
fs: remove ksys_ioctl
2020-07-31 08:16:01 +02:00
Kconfig
tmpfs: support 64-bit inums per-sb
2020-08-07 11:33:24 -07:00
Kconfig.binfmt
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
kernel_read_file.c
fs/kernel_file_read: Add "offset" arg for partial reads
2020-10-05 13:37:04 +02:00
libfs.c
f2fs-for-5.11-rc1
2020-12-17 11:18:00 -08:00
locks.c
Merge branch 'exec-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:29:43 -08:00
Makefile
Refactored code for 5.10:
2020-10-23 11:33:41 -07:00
mbcache.c
…
mount.h
mnt: Use generic ns_common::count
2020-08-19 14:14:19 +02:00
mpage.c
fs: convert mpage_readpages to mpage_readahead
2020-06-02 10:59:07 -07:00
namei.c
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-12-25 10:54:29 -08:00
namespace.c
umount(2): move the flag validity checks first
2021-01-04 15:31:58 -05:00
no-block.c
…
nsfs.c
nsproxy: attach to namespaces via pidfds
2020-05-13 11:41:22 +02:00
open.c
Merge branch 'exec-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:29:43 -08:00
pipe.c
block: remove i_bdev
2020-12-01 14:53:39 -07:00
pnode.c
propagate_one(): mnt_set_mountpoint() needs mount_lock
2020-04-27 10:37:14 -04:00
pnode.h
fs/namespace.c: WARN if mnt_count has become negative
2020-12-10 17:33:17 -05:00
posix_acl.c
vfs: clean up posix_acl_permission() logic aroudn MAY_NOT_BLOCK
2020-06-08 11:04:19 -07:00
proc_namespace.c
proc mountinfo: make splice available again
2020-12-27 12:00:36 -08:00
read_write.c
Refactored code for 5.10:
2020-10-23 11:33:41 -07:00
readdir.c
fs: remove ksys_getdents64
2020-07-31 08:16:00 +02:00
remap_range.c
vfs: verify source area in vfs_dedupe_file_range_one()
2020-12-14 15:26:13 +01:00
select.c
poll: fix performance regression due to out-of-line __put_user()
2021-01-08 11:06:29 -08:00
seq_file.c
fix return values of seq_read_iter()
2020-11-15 22:12:53 -05:00
signalfd.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
splice.c
io_uring-5.10-2020-10-24
2020-10-24 12:40:18 -07:00
stack.c
…
stat.c
fs: remove KSTAT_QUERY_FLAGS
2020-09-26 22:55:05 -04:00
statfs.c
block: remove i_bdev
2020-12-01 14:53:39 -07:00
super.c
block: remove i_bdev
2020-12-01 14:53:39 -07:00
sync.c
overlayfs update for 5.8
2020-06-09 15:40:50 -07:00
timerfd.c
…
userfaultfd.c
userfaultfd: add user-mode only option to unprivileged_userfaultfd sysctl knob
2020-12-15 12:13:46 -08:00
utimes.c
fs: expose utimes_common
2020-07-31 08:16:01 +02:00
xattr.c
vfs: move cap_convert_nscap() call into vfs_setxattr()
2020-12-14 15:26:13 +01:00