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Theodore Ts'o 6b289a7c34 ext4: fail ext4_iget for root directory if unallocated 
commit 8e4b5eae5decd9dfe5a4ee369c22028f90ab4c44 upstream.

If the root directory has an i_links_count of zero, then when the file
system is mounted, then when ext4_fill_super() notices the problem and
tries to call iput() the root directory in the error return path,
ext4_evict_inode() will try to free the inode on disk, before all of
the file system structures are set up, and this will result in an OOPS
caused by a NULL pointer dereference.

This issue has been assigned CVE-2018-1092.

https://bugzilla.kernel.org/show_bug.cgi?id=199179
https://bugzilla.redhat.com/show_bug.cgi?id=1560777

Reported-by: Wen Xu <wen.xu@gatech.edu>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-24 09:34:12 +02:00
..
9p
fs/9p: Compare qid.path in v9fs_test_inode
2017-11-30 08:39:05 +00:00
adfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-10-10 20:16:43 -07:00
affs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-10-10 20:16:43 -07:00
afs
afs: Fix abort on signal while waiting for call completion
2017-12-20 10:07:25 +01:00
autofs4
autofs: fix careless error in recent commit
2017-12-20 10:07:15 +01:00
befs
befs fixes for 4.9-rc1
2016-10-15 12:09:13 -07:00
bfs
Merge remote-tracking branch 'ovl/rename2' into for-linus
2016-10-10 23:02:51 -04:00
btrfs
btrfs: fix incorrect error return ret being passed to mapping_set_error
2018-04-13 19:47:58 +02:00
cachefiles
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-10-10 20:16:43 -07:00
ceph
ceph: only dirty ITER_IOVEC pages for direct read
2018-04-08 12:12:42 +02:00
cifs
smb3: Fix root directory when server returns inode number of zero
2018-04-24 09:34:11 +02:00
coda
coda: fix 'kernel memory exposure attempt' in fsync
2017-11-24 08:33:42 +01:00
configfs
configfs: Fix race between create_link and configfs_rmdir
2017-06-24 07:11:12 +02:00
cramfs
…
crypto
fscrypt: use ENOTDIR when setting encryption policy on nondirectory
2017-11-30 08:39:11 +00:00
debugfs
dentry name snapshots
2017-08-06 18:59:43 -07:00
devpts
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-10-10 20:16:43 -07:00
dlm
dlm: avoid double-free on error path in dlm_device_{register,unregister}
2017-09-09 17:39:40 +02:00
ecryptfs
eCryptfs: use after free in ecryptfs_release_messaging()
2017-11-30 08:39:03 +00:00
efivarfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-10-10 20:16:43 -07:00
efs
…
exofs
fs: exofs: print a hex number after a 0x prefix
2016-10-27 18:43:43 -07:00
exportfs
exportfs: be careful to only return expected errors.
2016-10-06 09:07:44 -04:00
ext2
ext2: Don't clear SGID when inheriting ACLs
2017-07-27 15:08:02 -07:00
ext4
ext4: fail ext4_iget for root directory if unallocated
2018-04-24 09:34:12 +02:00
f2fs
f2fs: relax node version check for victim data in gc
2018-03-22 09:17:45 +01:00
fat
fat: fix using uninitialized fields of fat_inode/fsinfo_inode
2017-03-15 10:02:52 +08:00
freevxfs
…
fscache
FS-Cache: fix dereference of NULL user_key_payload
2017-10-27 10:38:11 +02:00
fuse
fuse: fix READDIRPLUS skipping an entry
2017-11-02 09:49:13 +01:00
gfs2
GFS2: Take inode off order_write list when setting jdata flag
2017-12-20 10:07:30 +01:00
hfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-10-10 20:16:43 -07:00
hfsplus
hfsplus: Don't clear SGID when inheriting ACLs
2017-07-27 15:08:07 -07:00
hostfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-10-10 20:16:43 -07:00
hpfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-10-10 20:16:43 -07:00
hugetlbfs
hugetlbfs: initialize shared policy as part of inode allocation
2017-10-08 10:26:09 +02:00
isofs
isofs: fix timestamps beyond 2027
2017-11-30 08:39:04 +00:00
jbd2
jbd2: if the journal is aborted then don't allow update of the log tail
2018-04-24 09:34:12 +02:00
jffs2
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-10-10 20:16:43 -07:00
jfs
jfs: Don't clear SGID when inheriting ACLs
2017-08-06 18:59:39 -07:00
kernfs
kernfs: fix regression in kernfs_fop_write caused by wrong type
2018-02-17 13:21:15 +01:00
lockd
lockd: fix lockd shutdown race
2018-04-13 19:47:53 +02:00
logfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-10-10 20:16:43 -07:00
minix
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-10-10 20:16:43 -07:00
ncpfs
staging: ncpfs: memory corruption in ncp_read_kernel()
2018-03-28 18:39:23 +02:00
nfs
pNFS/flexfiles: missing error code in ff_layout_alloc_lseg()
2018-04-13 19:48:05 +02:00
nfs_common
lockd: fix "list_add double add" caused by legacy signal interface
2018-02-03 17:05:38 +01:00
nfsd
nfsd: remove blocked locks on client teardown
2018-03-28 18:39:21 +02:00
nilfs2
nilfs2: fix race condition that causes file system corruption
2017-11-30 08:39:03 +00:00
nls
…
notify
dentry name snapshots
2017-08-06 18:59:43 -07:00
ntfs
fs: remove the never implemented aio_fsync file operation
2016-10-30 13:09:42 -04:00
ocfs2
ocfs2: try a blocking lock before return AOP_TRUNCATED_PAGE
2018-02-22 15:43:52 +01:00
omfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-10-10 20:16:43 -07:00
openpromfs
fs: Replace CURRENT_TIME with current_time() for inode timestamps
2016-09-27 21:06:21 -04:00
orangefs
orangefs: do not wait for timeout if umounting
2018-03-24 11:00:16 +01:00
overlayfs
ovl: filter trusted xattr for non-admin
2018-04-13 19:48:12 +02:00
proc
fs/proc/kcore.c: use probe_kernel_read() instead of memcpy()
2018-02-17 13:21:18 +01:00
pstore
pstore: Use dynamic spinlock initializer
2017-08-06 18:59:43 -07:00
qnx4
…
qnx6
…
quota
quota: Check for register_shrinker() failure.
2018-02-03 17:05:39 +01:00
ramfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-10-10 20:16:43 -07:00
reiserfs
fs/reiserfs/journal.c: add missing resierfs_warning() arg
2018-04-24 09:34:09 +02:00
romfs
romfs: use different way to generate fsid for BLOCK or MTD
2017-06-17 06:41:56 +02:00
squashfs
vfs: Remove {get,set,remove}xattr inode operations
2016-10-07 21:48:36 -04:00
sysfs
sysfs: be careful of error returns from ops->show()
2017-04-12 12:41:11 +02:00
sysv
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-10-10 20:16:43 -07:00
tracefs
fs: Replace CURRENT_TIME with current_time() for inode timestamps
2016-09-27 21:06:21 -04:00
ubifs
ubifs: Check ubifs_wbuf_sync() return code
2018-04-24 09:34:08 +02:00
udf
udf: Avoid overflow when session starts at large offset
2017-12-20 10:07:33 +01:00
ufs
ufs_getfrag_block(): we only grab ->truncate_mutex on block creation path
2017-06-14 15:06:01 +02:00
xfs
xfs: quota: check result of register_shrinker()
2018-03-03 10:23:25 +01:00
aio.c
fs/aio: Use RCU accessors for kioctx_table->table[]
2018-03-22 09:18:00 +01:00
anon_inodes.c
…
attr.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-10-10 20:16:43 -07:00
bad_inode.c
bad_inode: add missing i_op initializers
2017-01-09 08:32:24 +01:00
binfmt_aout.c
…
binfmt_elf_fdpic.c
…
binfmt_elf.c
binfmt_elf: use ELF_ET_DYN_BASE only for PIE
2017-07-21 07:42:21 +02:00
binfmt_em86.c
fs/binfmt_em86.c: fix incompatible pointer type
2016-08-02 19:35:15 -04:00
binfmt_flat.c
binfmt_flat: allow compressed flat binary format to work on MMU systems
2016-07-28 13:29:12 +10:00
binfmt_misc.c
fs: Replace current_fs_time() with current_time()
2016-09-27 21:06:22 -04:00
binfmt_script.c
…
block_dev.c
fs/mpage.c: fix mpage_writepage() for pages with buffers
2017-10-18 09:35:39 +02:00
buffer.c
fs: add i_blocksize()
2017-06-14 15:06:00 +02:00
char_dev.c
dax: define a unified inode/address_space for device-dax mappings
2016-08-23 22:58:51 -07:00
compat_binfmt_elf.c
binfmt_elf: compat: avoid unused function warning
2018-02-25 11:05:55 +01:00
compat_ioctl.c
fs: compat: Remove warning from COMPATIBLE_IOCTL
2018-04-08 12:12:44 +02:00
compat.c
compat: remove compat_printk()
2016-09-27 21:20:53 -04:00
coredump.c
coredump: Ensure proper size of sparse core files
2017-07-05 14:40:26 +02:00
dax.c
fs/dax.c: fix inefficiency in dax_writeback_mapping_range()
2018-02-28 10:18:33 +01:00
dcache.c
VFS: close race between getcwd() and d_move()
2018-04-13 19:48:09 +02:00
dcookies.c
…
direct-io.c
direct-io: Prevent NULL pointer access in submit_page_section
2017-10-18 09:35:41 +02:00
drop_caches.c
…
eventfd.c
…
eventpoll.c
epoll: fix race between ep_poll_callback(POLLFREE) and ep_free()/ep_remove()
2017-09-07 08:35:41 +02:00
exec.c
exec: Limit arg stack to at most 75% of _STK_LIM
2017-07-21 07:42:22 +02:00
fcntl.c
fs/fcntl: f_setown, avoid undefined behaviour
2018-01-31 12:55:52 +01:00
fhandle.c
…
file_table.c
…
file.c
fs/file: more unsigned file descriptors
2016-09-27 18:47:38 -04:00
filesystems.c
…
fs_pin.c
…
fs_struct.c
…
fs-writeback.c
writeback: fix memory leak in wb_queue_work()
2017-12-20 10:07:20 +01:00
inode.c
xfs: evict all inodes involved with log redo item
2017-09-20 08:20:01 +02:00
internal.h
xfs: evict all inodes involved with log redo item
2017-09-20 08:20:01 +02:00
ioctl.c
vfs: cap dedupe request structure size at PAGE_SIZE
2016-09-15 13:29:52 -07:00
iomap.c
iomap: fix integer truncation issues in the zeroing and dirtying helpers
2017-09-20 08:19:59 +02:00
Kconfig
mm/hugetlb: introduce ARCH_HAS_GIGANTIC_PAGE
2016-10-07 18:46:29 -07:00
Kconfig.binfmt
ARM: 8594/1: enable binfmt_flat on systems with an MMU
2016-08-12 16:47:05 +01:00
libfs.c
libfs: Modify mount_pseudo_xattr to be clear it is not a userspace mount
2017-12-09 22:01:51 +01:00
locks.c
locking, fs/locks: Add missing file_sem locks
2016-10-18 12:21:28 +02:00
Makefile
…
mbcache.c
mbcache: initialize entry->e_referenced in mb_cache_entry_create()
2018-02-22 15:43:48 +01:00
mount.h
mnt: In propgate_umount handle visiting mounts in any order
2017-07-21 07:42:22 +02:00
mpage.c
fs/mpage.c: fix mpage_writepage() for pages with buffers
2017-10-18 09:35:39 +02:00
namei.c
getname_kernel() needs to make sure that ->name != ->iname in long case
2018-04-20 08:21:07 +02:00
namespace.c
mnt: In propgate_umount handle visiting mounts in any order
2017-07-21 07:42:22 +02:00
no-block.c
…
nsfs.c
nsfs: mark dentry with DCACHE_RCUACCESS
2018-02-17 13:21:15 +01:00
open.c
fs: completely ignore unknown open flags
2017-07-12 15:01:02 +02:00
pipe.c
pipe: fix off-by-one error when checking buffer limits
2018-02-17 13:21:18 +01:00
pnode.c
mnt: Make propagate_umount less slow for overlapping mount propagation trees
2017-07-21 07:42:22 +02:00
pnode.h
mnt: Tuck mounts under others instead of creating shadow/side mounts.
2017-03-15 10:02:43 +08:00
posix_acl.c
tmpfs: clear S_ISGID when setting posix ACLs
2017-01-26 08:24:37 +01:00
proc_namespace.c
…
read_write.c
vfs: deny copy_file_range() for non regular files
2017-10-12 11:51:26 +02:00
readdir.c
…
select.c
fs/select: add vmalloc fallback for select(2)
2016-10-11 15:06:30 -07:00
seq_file.c
seq/proc: modify seq_put_decimal_[u]ll to take a const char *, not char
2016-10-07 18:46:30 -07:00
signalfd.c
…
splice.c
vfs: fix uninitialized flags in splice_to_pipe()
2017-02-23 17:44:35 +01:00
stack.c
…
stat.c
ufs: restore maintaining ->i_blocks
2017-06-14 15:06:01 +02:00
statfs.c
…
super.c
sget(): handle failures of register_shrinker()
2018-03-03 10:23:21 +01:00
sync.c
…
timerfd.c
timerfd: Protect the might cancel mechanism proper
2017-05-08 07:47:54 +02:00
userfaultfd.c
userfaultfd: shmem: __do_fault requires VM_FAULT_NOPAGE
2017-12-20 10:07:18 +01:00
utimes.c
Merge remote-tracking branch 'jk/vfs' into work.misc
2016-10-08 11:06:08 -04:00
xattr.c
lsm: fix smack_inode_removexattr and xattr_getsecurity memleak
2017-10-12 11:51:19 +02:00