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Nikolay Borisov ea6c95031b btrfs: handle error of get_old_root 
[ Upstream commit 315bed43fea532650933e7bba316a7601d439edf ]

In btrfs_search_old_slot get_old_root is always used with the assumption
it cannot fail. However, this is not true in rare circumstance it can
fail and return null. This will lead to null point dereference when the
header is read. Fix this by checking the return value and properly
handling NULL by setting ret to -EIO and returning gracefully.

Coverity-id: 1087503
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-11-28 18:25:38 +01:00
..
9p 9p: avoid attaching writeback_fid on mmap with type PRIVATE 2019-10-17 13:40:54 -07:00
adfs fs/adfs: super: fix use-after-free bug 2019-08-06 18:28:26 +02:00
affs affs_lookup(): close a race with affs_remove_link() 2018-05-30 07:48:51 +02:00
afs afs: Fix afs_kill_pages() 2017-12-20 10:04:56 +01:00
autofs4 autofs: fix error return in autofs_fill_super() 2019-03-23 08:44:27 +01:00
befs
bfs bfs: add sanity check at bfs_fill_super() 2018-12-01 09:46:33 +01:00
btrfs btrfs: handle error of get_old_root 2019-11-28 18:25:38 +01:00
cachefiles fscache, cachefiles: remove redundant variable 'cache' 2018-12-17 21:55:12 +01:00
ceph ceph: fix use-after-free in __ceph_remove_cap() 2019-11-12 19:13:20 +01:00
cifs cifs: Fix cifsInodeInfo lock_sem deadlock when reconnect occurs 2019-11-10 11:21:10 +01:00
coda coda: add error handling for fget 2019-08-06 18:28:27 +02:00
configfs configfs: fix a deadlock in configfs_symlink() 2019-11-12 19:13:24 +01:00
cramfs Cramfs: fix abad comparison when wrap-arounds occur 2018-11-21 09:27:37 +01:00
debugfs debugfs: fix use-after-free on symlink traversal 2019-05-16 19:45:01 +02:00
devpts devpts: clean up interface to pty drivers 2016-08-16 09:30:49 +02:00
dlm dlm: Don't swamp the CPU with callbacks queued during recovery 2019-02-20 10:13:04 +01:00
ecryptfs ecryptfs_lookup_interpose(): lower_dentry->d_parent is not stable either 2019-11-25 15:53:43 +01:00
efivarfs efi: Make efivarfs entries immutable by default 2016-03-03 15:07:09 -08:00
efs
exofs fs/exofs: fix potential memory leak in mount option parsing 2018-11-27 16:08:00 +01:00
exportfs exportfs: do not read dentry after free 2018-12-17 21:55:10 +01:00
ext2 ext2: Fix underflow in ext2_max_size() 2019-03-23 08:44:36 +01:00
ext4 ext4: fix punch hole for inline_data file systems 2019-10-05 12:27:54 +02:00
f2fs f2fs: return correct errno in f2fs_gc 2019-11-25 15:54:27 +01:00
fat fat: work around race with userspace's read via blockdev while mounting 2019-10-07 21:01:02 +02:00
freevxfs
fscache fscache: fix race between enablement and dropping of object 2018-12-17 21:55:11 +01:00
fuse fuse: use READ_ONCE on congestion_threshold and max_background 2019-11-25 15:54:17 +01:00
gfs2 gfs2: Fix marking bitmaps non-full 2019-11-28 18:25:35 +01:00
hfs hfs: do not free node before using 2018-12-17 21:55:12 +01:00
hfsplus hfsplus: do not free node before using 2018-12-17 21:55:12 +01:00
hostfs hostfs: Freeing an ERR_PTR in hostfs_fill_sb_common() 2016-09-30 10:18:39 +02:00
hpfs hpfs: implement the show_options method 2016-06-01 12:15:54 -07:00
hugetlbfs hugetlb: use same fault hash key for shared and private mappings 2019-06-11 12:23:52 +02:00
isofs isofs: fix timestamps beyond 2027 2017-11-30 08:37:20 +00:00
jbd2 jbd2: fix compile warning when using JBUFFER_TRACE 2019-03-23 08:44:37 +01:00
jffs2 jffs2: fix use-after-free on symlink traversal 2019-05-16 19:45:01 +02:00
jfs jfs: Fix inconsistency between memory allocation and ea_buf->max_size 2018-08-09 12:19:28 +02:00
kernfs kernfs: Fix range checks in kernfs_get_target_path 2019-11-25 15:53:59 +01:00
lockd lockd: fix access beyond unterminated strings in prints 2018-11-21 09:27:36 +01:00
logfs mm, fs: introduce mapping_gfp_constraint() 2015-11-06 17:50:42 -08:00
minix
ncpfs ncpfs: fix build warning of strncpy 2019-03-23 08:44:21 +01:00
nfs NFSv4.x: fix lock recovery during delegation recall 2019-11-25 15:54:43 +01:00
nfs_common lockd: fix "list_add double add" caused by legacy signal interface 2018-02-03 17:04:28 +01:00
nfsd nfsd: Fix overflow causing non-working mounts on 1 TB machines 2019-08-04 09:34:55 +02:00
nilfs2 do d_instantiate/unlock_new_inode combinations safely 2018-05-30 07:48:52 +02:00
nls
notify fanotify: fix logic of events on child 2018-04-24 09:32:11 +02:00
ntfs mm, fs: introduce mapping_gfp_constraint() 2015-11-06 17:50:42 -08:00
ocfs2 Revert "fs: ocfs2: fix possible null-pointer dereferences in ocfs2_xa_prepare_entry()" 2019-11-28 18:25:26 +01:00
omfs
openpromfs
overlayfs ovl: filter of trusted xattr results in audit 2019-10-05 12:27:56 +02:00
proc proc/vmcore: Fix i386 build error of missing copy_oldmem_page_encrypted() 2019-11-25 15:54:47 +01:00
pstore pstore/ram: Do not treat empty buffers as valid 2019-01-26 09:42:53 +01:00
qnx4
qnx6
quota fs/quota: Fix spectre gadget in do_quotactl 2018-09-09 20:04:36 +02:00
ramfs mm, fs: obey gfp_mapping for add_to_page_cache() 2015-10-16 11:42:28 -07:00
reiserfs reiserfs: propagate errors from fill_with_dentries() properly 2018-11-27 16:08:00 +01:00
romfs romfs: use different way to generate fsid for BLOCK or MTD 2017-06-17 06:39:38 +02:00
squashfs squashfs: more metadata hardenings 2018-08-06 16:24:42 +02:00
sysfs scsi: sysfs: Introduce sysfs_{un,}break_active_protection() 2018-09-05 09:18:40 +02:00
sysv sysv: return 'err' instead of 0 in __sysv_write_inode 2018-12-17 21:55:09 +01:00
tracefs tracefs: Fix refcount imbalance in start_creating() 2015-11-04 22:13:45 -05:00
ubifs ubifs: Check for name being NULL while mounting 2018-10-13 09:11:34 +02:00
udf udf: Fix incorrect final NOT_ALLOCATED (hole) extent length 2019-07-21 09:07:08 +02:00
ufs ufs: fix braino in ufs_get_inode_gid() for solaris UFS flavour 2019-06-11 12:23:49 +02:00
xfs xfs: Correctly invert xfs_buftarg LRU isolation logic 2019-11-06 12:09:25 +01:00
aio.c aio: fix spectre gadget in lookup_ioctx 2018-12-21 14:09:50 +01:00
anon_inodes.c
attr.c vfs: move permission checking into notify_change() for utimes(NULL) 2016-10-22 12:26:56 +02:00
bad_inode.c
binfmt_aout.c
binfmt_elf.c binfmt_elf: switch to new creds when switching to new mm 2019-04-27 09:33:53 +02:00
binfmt_elf_fdpic.c libnvdimm for 4.4: 2015-11-10 12:07:22 -08:00
binfmt_em86.c
binfmt_flat.c fs/binfmt_flat.c: make load_flat_shared_library() work 2019-07-10 09:56:30 +02:00
binfmt_misc.c fs/binfmt_misc.c: do not allow offset overflow 2018-07-03 11:21:26 +02:00
binfmt_script.c exec: load_script: Do not exec truncated interpreter path 2019-11-06 12:09:12 +01:00
block_dev.c fs/block_dev: always invalidate cleancache in invalidate_bdev() 2017-05-20 14:27:01 +02:00
buffer.c fs: fix guard_bio_eod to check for real EOD errors 2019-04-27 09:33:49 +02:00
char_dev.c chardev: add additional check for minor range overlap 2019-06-11 12:24:03 +02:00
compat.c
compat_binfmt_elf.c binfmt_elf: compat: avoid unused function warning 2018-02-25 11:03:51 +01:00
compat_ioctl.c compat_ioctl: pppoe: fix PPPOEIOCSFWD handling 2019-08-11 12:20:46 +02:00
coredump.c coredump: Ensure proper size of sparse core files 2017-07-05 14:37:20 +02:00
dax.c dax: disable pmd mappings 2015-11-16 23:54:45 -08:00
dcache.c fs/dcache: move security_d_instantiate() behind attaching dentry to inode 2019-11-10 11:21:39 +01:00
dcookies.c
direct-io.c direct-io: Prevent NULL pointer access in submit_page_section 2017-10-18 09:20:42 +02:00
drop_caches.c fs/drop_caches.c: avoid softlockups in drop_pagecache_sb() 2019-03-23 08:44:26 +01:00
eventfd.c
eventpoll.c fs/epoll: drop ovflist branch prediction 2019-02-20 10:13:14 +01:00
exec.c sched/fair: Don't free p->numa_faults with concurrent readers 2019-08-04 09:35:02 +02:00
fcntl.c fs/fcntl: f_setown, avoid undefined behaviour 2018-01-31 12:06:11 +01:00
fhandle.c fs/coredump: prevent fsuid=0 dumps into user-controlled directories 2016-04-12 09:08:58 -07:00
file.c fs/file.c: initialize init_files.resize_wait 2019-04-27 09:33:49 +02:00
file_table.c
filesystems.c
fs-writeback.c cgroup,writeback: don't switch wbs immediately on dead wbs if the memcg is dead 2019-11-12 19:13:31 +01:00
fs_pin.c
fs_struct.c
inode.c Abort file_remove_privs() for non-reg. files 2019-06-22 08:18:27 +02:00
internal.h
ioctl.c
Kconfig dax: disable pmd mappings 2015-11-16 23:54:45 -08:00
Kconfig.binfmt
libfs.c
locks.c locks: don't check for race with close when setting OFD lock 2018-01-17 09:35:27 +01:00
Makefile ext4: promote ext4 over ext2 in the default probe order 2015-10-15 10:33:21 -04:00
mbcache.c
mount.h mnt: In propgate_umount handle visiting mounts in any order 2017-07-21 07:44:57 +02:00
mpage.c fs: add i_blocksize() 2017-06-14 13:16:24 +02:00
namei.c namei: allow restricted O_CREAT of FIFOs and regular files 2018-12-01 09:46:41 +01:00
namespace.c mount: Prevent MNT_DETACH from disconnecting locked mounts 2018-11-21 09:27:44 +01:00
no-block.c
nsfs.c nsfs: mark dentry with DCACHE_RCUACCESS 2018-02-16 20:09:43 +01:00
open.c access: avoid the RCU grace period for the temporary subjective credentials 2019-08-04 09:35:01 +02:00
pipe.c pipe: cap initial pipe capacity according to pipe-max-size limit 2018-05-26 08:48:51 +02:00
pnode.c mnt: Make propagate_umount less slow for overlapping mount propagation trees 2017-07-21 07:44:58 +02:00
pnode.h mnt: Add a per mount namespace limit on the number of mounts 2017-04-30 05:49:28 +02:00
posix_acl.c tmpfs: clear S_ISGID when setting posix ACLs 2017-01-26 08:23:47 +01:00
proc_namespace.c vfs: show_vfsstat: do not ignore errors from show_devname method 2016-04-12 09:08:55 -07:00
read_write.c fs: stream_open - opener for stream-like files so that read and write can run simultaneously without deadlock 2019-06-11 12:24:13 +02:00
readdir.c
select.c fs/select: add vmalloc fallback for select(2) 2018-01-31 12:06:09 +01:00
seq_file.c Make file credentials available to the seqfile interfaces 2017-08-06 19:19:42 -07:00
signalfd.c
splice.c vfs: fix uninitialized flags in splice_to_pipe() 2017-02-23 17:43:09 +01:00
stack.c
stat.c ufs: restore maintaining ->i_blocks 2017-06-14 13:16:24 +02:00
statfs.c
super.c fs: don't scan the inode cache before SB_BORN is set 2019-02-06 19:43:08 +01:00
sync.c fs/sync.c: make sync_file_range(2) use WB_SYNC_NONE writeback 2015-11-06 17:50:42 -08:00
timerfd.c timerfd: Protect the might cancel mechanism proper 2017-05-08 07:46:01 +02:00
userfaultfd.c userfaultfd_release: always remove uffd flags and clear vm_userfaultfd_ctx 2019-09-06 10:18:09 +02:00
utimes.c vfs: move permission checking into notify_change() for utimes(NULL) 2016-10-22 12:26:56 +02:00
xattr.c getxattr: use correct xattr length 2018-09-09 20:04:36 +02:00