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Yu Kuai 3593093803 reiserfs: add check for root_inode in reiserfs_fill_super 
[ Upstream commit 2acf15b94d5b8ea8392c4b6753a6ffac3135cd78 ]

Our syzcaller report a NULL pointer dereference:

BUG: kernel NULL pointer dereference, address: 0000000000000000
PGD 116e95067 P4D 116e95067 PUD 1080b5067 PMD 0
Oops: 0010 [#1] SMP KASAN
CPU: 7 PID: 592 Comm: a.out Not tainted 5.13.0-next-20210629-dirty #67
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-p4
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffff888114e779b8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff110229cef39 RCX: ffffffffaa67e1aa
RDX: 0000000000000000 RSI: ffff88810a58ee00 RDI: ffff8881233180b0
RBP: ffffffffac38e9c0 R08: ffffffffaa67e17e R09: 0000000000000001
R10: ffffffffb91c5557 R11: fffffbfff7238aaa R12: ffff88810a58ee00
R13: ffff888114e77aa0 R14: 0000000000000000 R15: ffff8881233180b0
FS:  00007f946163c480(0000) GS:ffff88839f1c0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001099c1000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __lookup_slow+0x116/0x2d0
 ? page_put_link+0x120/0x120
 ? __d_lookup+0xfc/0x320
 ? d_lookup+0x49/0x90
 lookup_one_len+0x13c/0x170
 ? __lookup_slow+0x2d0/0x2d0
 ? reiserfs_schedule_old_flush+0x31/0x130
 reiserfs_lookup_privroot+0x64/0x150
 reiserfs_fill_super+0x158c/0x1b90
 ? finish_unfinished+0xb10/0xb10
 ? bprintf+0xe0/0xe0
 ? __mutex_lock_slowpath+0x30/0x30
 ? __kasan_check_write+0x20/0x30
 ? up_write+0x51/0xb0
 ? set_blocksize+0x9f/0x1f0
 mount_bdev+0x27c/0x2d0
 ? finish_unfinished+0xb10/0xb10
 ? reiserfs_kill_sb+0x120/0x120
 get_super_block+0x19/0x30
 legacy_get_tree+0x76/0xf0
 vfs_get_tree+0x49/0x160
 ? capable+0x1d/0x30
 path_mount+0xacc/0x1380
 ? putname+0x97/0xd0
 ? finish_automount+0x450/0x450
 ? kmem_cache_free+0xf8/0x5a0
 ? putname+0x97/0xd0
 do_mount+0xe2/0x110
 ? path_mount+0x1380/0x1380
 ? copy_mount_options+0x69/0x140
 __x64_sys_mount+0xf0/0x190
 do_syscall_64+0x35/0x80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

This is because 'root_inode' is initialized with wrong mode, and
it's i_op is set to 'reiserfs_special_inode_operations'. Thus add
check for 'root_inode' to fix the problem.

Link: https://lore.kernel.org/r/20210702040743.1918552-1-yukuai3@huawei.com
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-08-15 13:03:32 +02:00
..
9p
9P: Cast to loff_t before multiplying
2020-11-05 11:07:03 +01:00
adfs
fs/adfs: super: fix use-after-free bug
2019-08-06 19:05:21 +02:00
affs
fs/affs: release old buffer head on error path
2021-03-03 18:22:54 +01:00
afs
afs: Fix some tracing details
2020-04-02 16:34:33 +02:00
autofs4
autofs: fix a leak in autofs_expire_indirect()
2019-12-17 20:37:24 +01:00
befs
…
bfs
bfs: add sanity check at bfs_fill_super()
2018-12-01 09:42:51 +01:00
btrfs
btrfs: mark compressed range uptodate only if all bio succeed
2021-08-08 08:53:29 +02:00
cachefiles
cachefiles: Handle readpage error correctly
2020-11-05 11:07:05 +01:00
ceph
ceph: remove bogus checks and WARN_ONs from ceph_set_page_dirty
2021-07-20 16:17:52 +02:00
cifs
SMB3: incorrect file id in requests compounded with open
2021-06-03 08:36:22 +02:00
coda
coda: add error handling for fget
2019-08-06 19:05:23 +02:00
configfs
configfs: fix memleak in configfs_release_bin_file
2021-07-20 16:17:41 +02:00
cramfs
Cramfs: fix abad comparison when wrap-arounds occur
2018-11-13 11:15:12 -08:00
crypto
fscrypt: don't ignore minor_hash when hash is 0
2021-07-20 16:17:45 +02:00
debugfs
debugfs: fix use-after-free on symlink traversal
2019-05-08 07:20:49 +02:00
devpts
fs/devpts: always delete dcache dentry-s in dput()
2019-03-23 14:35:21 +01:00
dlm
fs: dlm: fix memory leak when fenced
2021-07-20 16:17:33 +02:00
ecryptfs
Revert "ecryptfs: replace BUG_ON with error handling code"
2021-05-26 11:47:00 +02:00
efivarfs
efivarfs: revert "fix memory leak in efivarfs_create()"
2020-12-02 08:34:44 +01:00
efs
…
exofs
exofs_mount(): fix leaks on failure exits
2019-12-05 15:37:28 +01:00
exportfs
exportfs: fix 'passing zero to ERR_PTR()' warning
2020-01-27 14:46:06 +01:00
ext2
ext2: fix missing percpu_counter_inc
2020-08-21 09:48:18 +02:00
ext4
ext4: fix potential htree corruption when growing large_dir directories
2021-08-15 13:03:31 +02:00
f2fs
f2fs: add MODULE_SOFTDEP to ensure crc32 is included in the initramfs
2021-07-20 16:17:53 +02:00
fat
fat: don't allow to mount if the FAT length == 0
2020-06-20 10:25:05 +02:00
freevxfs
…
fscache
fscache: fix race between enablement and dropping of object
2018-12-17 09:28:53 +01:00
fuse
fuse: reject internal errno
2021-07-20 16:17:45 +02:00
gfs2
gfs2: Fix use-after-free in gfs2_glock_shrink_scan
2021-06-30 08:48:46 -04:00
hfs
hfs: add lock nesting notation to hfs_find_init
2021-08-04 12:22:15 +02:00
hfsplus
hfsplus: fix crash and filesystem corruption when deleting files
2020-04-24 08:00:45 +02:00
hostfs
…
hpfs
…
hugetlbfs
hugetlbfs: hugetlb_fault_mutex_hash() cleanup
2021-06-03 08:36:25 +02:00
isofs
isofs: release buffer head before return
2021-03-03 18:22:46 +01:00
jbd2
jbd2: abort journal if free a async write error metadata buffer
2020-09-03 11:22:29 +02:00
jffs2
jffs2: check the validity of dstlen in jffs2_zlib_compress()
2021-05-22 10:57:22 +02:00
jfs
fs/jfs: Fix missing error code in lmLogInit()
2021-07-20 16:17:49 +02:00
kernfs
kernfs: deal with kernfs_fill_super() failures
2021-06-30 08:48:55 -04:00
lockd
lockd: don't use interval-based rebinding over TCP
2020-12-29 13:46:57 +01:00
minix
fs/minix: reject too-large maximum file size
2020-08-21 09:48:15 +02:00
ncpfs
…
nfs
NFSv4/pNFS: Don't call _nfs4_pnfs_v3_ds_connect multiple times
2021-07-20 16:17:54 +02:00
nfs_common
nfs_common: need lock during iterate through the list
2020-12-29 13:47:01 +01:00
nfsd
nfsd4: readdirplus shouldn't return parent of export
2021-01-23 15:48:45 +01:00
nilfs2
nilfs2: fix memory leak in nilfs_sysfs_delete_device_group
2021-06-30 08:48:59 -04:00
nls
…
notify
fs: avoid softlockups in s_inodes iterators
2020-01-12 12:11:59 +01:00
ntfs
ntfs: fix validity check for file name attribute
2021-07-20 16:17:28 +02:00
ocfs2
ocfs2: issue zeroout to EOF blocks
2021-08-04 12:22:15 +02:00
omfs
…
openpromfs
…
orangefs
orangefs: fix orangefs df output.
2021-07-20 16:17:52 +02:00
overlayfs
ovl: skip getxattr of security labels
2021-02-23 14:00:31 +01:00
proc
proc: Avoid mixing integer types in mem_rw()
2021-07-28 11:12:18 +02:00
pstore
pstore/ram: Write new dumps to start of recycled zones
2020-01-09 10:17:55 +01:00
qnx4
…
qnx6
…
quota
quota: Fix memory leak when handling corrupted quota file
2021-03-03 18:22:44 +01:00
ramfs
ramfs: fix nommu mmap with gaps in the page cache
2020-10-29 09:07:11 +01:00
reiserfs
reiserfs: add check for root_inode in reiserfs_fill_super
2021-08-15 13:03:32 +02:00
romfs
romfs: fix uninitialized memory leak in romfs_dev_read()
2020-08-26 10:29:54 +02:00
squashfs
squashfs: fix divide error in calculate_skip()
2021-05-22 10:57:39 +02:00
sysfs
unfuck sysfs_mount()
2021-06-30 08:48:55 -04:00
sysv
sysv: return 'err' instead of 0 in __sysv_write_inode
2018-12-17 09:28:48 +01:00
tracefs
…
ubifs
ubifs: Set/Clear I_LINKABLE under i_lock for whiteout inode
2021-07-20 16:17:54 +02:00
udf
udf: Fix NULL pointer dereference in udf_symlink function
2021-07-20 16:17:42 +02:00
ufs
fs/ufs: avoid potential u32 multiplication overflow
2020-08-21 09:48:22 +02:00
xfs
xfs: Fix assert failure in xfs_setattr_size()
2021-03-07 11:27:43 +01:00
aio.c
aio: fix spectre gadget in lookup_ioctx
2018-12-21 14:13:04 +01:00
anon_inodes.c
…
attr.c
…
bad_inode.c
…
binfmt_aout.c
…
binfmt_elf_fdpic.c
…
binfmt_elf.c
fs/binfmt_elf.c: allocate initialized memory in fill_thread_core_info()
2020-06-03 08:18:03 +02:00
binfmt_em86.c
…
binfmt_flat.c
fs/binfmt_flat.c: make load_flat_shared_library() work
2019-07-03 13:15:59 +02:00
binfmt_misc.c
binfmt_misc: fix possible deadlock in bm_register_write
2021-03-17 16:34:35 +01:00
binfmt_script.c
exec: load_script: Do not exec truncated interpreter path
2019-11-06 12:42:59 +01:00
block_dev.c
block: reexpand iov_iter after read/write
2021-05-22 10:57:43 +02:00
buffer.c
fs: Don't invalidate page buffers in block_write_full_page()
2020-11-05 11:06:58 +01:00
char_dev.c
chardev: Avoid potential use-after-free in 'chrdev_open()'
2020-01-14 20:05:39 +01:00
compat_binfmt_elf.c
…
compat_ioctl.c
fix compat handling of FICLONERANGE, FIDEDUPERANGE and FS_IOC_FIEMAP
2020-01-09 10:17:58 +01:00
compat.c
…
coredump.c
coredump: fix crash when umh is disabled
2020-05-20 08:16:58 +02:00
dax.c
dax: pass NOWAIT flag to iomap_apply
2020-03-11 18:02:43 +01:00
dcache.c
fs/dcache: Fix incorrect nr_dentry_unused accounting in shrink_dcache_sb()
2019-02-06 17:31:34 +01:00
dcookies.c
…
direct-io.c
fs: direct-io: fix missing sdio->boundary
2021-04-16 11:57:48 +02:00
drop_caches.c
fs: avoid softlockups in s_inodes iterators
2020-01-12 12:11:59 +01:00
eventfd.c
…
eventpoll.c
ep_create_wakeup_source(): dentry name can change under you...
2020-10-14 09:51:09 +02:00
exec.c
mm: fix exec activate_mm vs TLB shootdown and lazy tlb switching race
2020-11-18 18:28:03 +01:00
fcntl.c
…
fhandle.c
…
file_table.c
…
file.c
fix multiplication overflow in copy_fdtable()
2020-05-27 16:42:51 +02:00
filesystems.c
fs/filesystems.c: downgrade user-reachable WARN_ONCE() to pr_warn_once()
2020-04-24 08:00:43 +02:00
fs_pin.c
…
fs_struct.c
…
fs-writeback.c
writeback: fix obtain a reference to a freeing memcg css
2021-07-20 16:17:37 +02:00
inode.c
futex: Fix inode life-time issue
2020-04-02 16:34:21 +02:00
internal.h
…
ioctl.c
vfs: swap names of {do,vfs}_clone_file_range()
2018-11-10 07:48:33 -08:00
iomap.c
iomap: Fix pipe page leakage during splicing
2019-12-17 20:38:57 +01:00
Kconfig
…
Kconfig.binfmt
…
libfs.c
libfs: fix error cast of negative value in simple_attr_write()
2020-11-24 13:05:50 +01:00
locks.c
locks: print unsigned ino in /proc/locks
2020-01-09 10:17:55 +01:00
Makefile
…
mbcache.c
…
mount.h
…
mpage.c
…
namei.c
namei: only return -ECHILD from follow_dotdot_rcu()
2020-03-11 18:02:53 +01:00
namespace.c
fs/namespace.c: fix mountpoint reference counter race
2020-05-02 17:24:20 +02:00
no-block.c
…
nsfs.c
…
open.c
cifs_atomic_open(): fix double-put on late allocation failure
2020-03-20 10:54:16 +01:00
pipe.c
pipe: increase minimum default pipe size to 2 pages
2021-08-15 13:03:31 +02:00
pnode.c
propagate_one(): mnt_set_mountpoint() needs mount_lock
2020-05-02 17:24:47 +02:00
pnode.h
…
posix_acl.c
…
proc_namespace.c
…
read_write.c
vfs: avoid problematic remapping requests into partial EOF block
2019-12-01 09:13:51 +01:00
readdir.c
readdir: make sure to verify directory entry for legacy interfaces too
2021-04-28 12:08:41 +02:00
select.c
kernel, fs: Introduce and use set_restart_fn() and arch_set_restart_data()
2021-03-24 11:05:05 +01:00
seq_file.c
seq_file: disallow extremely large seq buffer allocations
2021-07-20 16:17:55 +02:00
signalfd.c
…
splice.c
fs: prevent page refcount overflow in pipe_buf_get
2019-05-04 09:15:18 +02:00
stack.c
…
stat.c
…
statfs.c
vfs: Fix EOVERFLOW testing in put_compat_statfs64
2019-10-11 18:18:48 +02:00
super.c
vfs: remove lockdep bogosity in __sb_start_write
2020-11-24 13:05:44 +01:00
sync.c
…
timerfd.c
…
userfaultfd.c
userfaultfd: require CAP_SYS_PTRACE for UFFD_FEATURE_EVENT_FORK
2020-01-04 13:59:58 +01:00
utimes.c
…
xattr.c
xattr: break delegations in {set,remove}xattr
2020-08-21 09:48:00 +02:00