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Ryusuke Konishi 468f3e11a8 nilfs2: fix crash after one superblock became unavailable 
commit 0ca7a5b9ac5d301845dd6382ff25a699b6263a81 upstream.

Fixes the following kernel oops in nilfs_setup_super() which could
arise if one of two super-blocks is unavailable.

> BUG: unable to handle kernel NULL pointer dereference at   (null)
> Pid: 3529, comm: mount.nilfs2 Not tainted 2.6.37 #1 /
> EIP: 0060:[<c03196bc>] EFLAGS: 00010202 CPU: 3
> EIP is at memcpy+0xc/0x1b
> Call Trace:
>  [<f953720e>] ? nilfs_setup_super+0x6c/0xa5 [nilfs2]
>  [<f95369e9>] ? nilfs_get_root_dentry+0x81/0xcb [nilfs2]
>  [<f9537a08>] ? nilfs_mount+0x4f9/0x62c [nilfs2]
>  [<c02745cf>] ? kstrdup+0x36/0x3f
>  [<f953750f>] ? nilfs_mount+0x0/0x62c [nilfs2]
>  [<c0293940>] ? vfs_kern_mount+0x4d/0x12c
>  [<c02a5100>] ? get_fs_type+0x76/0x8f
>  [<c0293a68>] ? do_kern_mount+0x33/0xbf
>  [<c02a784a>] ? do_mount+0x2ed/0x714
>  [<c02a6171>] ? copy_mount_options+0x28/0xfc
>  [<c02a7ce3>] ? sys_mount+0x72/0xaf
>  [<c0473085>] ? syscall_call+0x7/0xb

Reported-by: Wakko Warner <wakko@animx.eu.org>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Tested-by: Wakko Warner <wakko@animx.eu.org>
LKML-Reference: <20110121024918.GA29598@animx.eu.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-02-17 15:14:59 -08:00
..
9p
convert v9fs
2010-10-29 04:16:38 -04:00
adfs
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
affs
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
afs
convert afs
2010-10-29 04:17:13 -04:00
autofs4
autofs4 - remove ioctl mutex (bz23142)
2010-12-07 07:45:44 -08:00
befs
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
bfs
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
btrfs
Fix btrfs b0rkage
2010-12-20 09:09:57 -08:00
cachefiles
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
ceph
ceph: mark user pages dirty on direct-io reads
2010-12-17 09:54:40 -08:00
cifs
cifs: Fix regression during share-level security mounts (Repost)
2011-02-17 15:14:44 -08:00
coda
convert get_sb_nodev() users
2010-10-29 04:16:31 -04:00
configfs
convert get_sb_single() users
2010-10-29 04:16:28 -04:00
cramfs
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
debugfs
convert get_sb_single() users
2010-10-29 04:16:28 -04:00
devpts
convert get_sb_single() users
2010-10-29 04:16:28 -04:00
dlm
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm
2010-10-22 17:33:16 -07:00
ecryptfs
BKL: remove extraneous #include <smp_lock.h>
2010-11-17 08:59:32 -08:00
efs
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
exofs
Revert "exofs: Set i_mapping->backing_dev_info anyway"
2011-02-17 15:14:36 -08:00
exportfs
exportfs: use dget_parent
2010-10-25 21:26:13 -04:00
ext2
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
ext3
BKL: remove extraneous #include <smp_lock.h>
2010-11-17 08:59:32 -08:00
ext4
ext4: make grpinfo slab cache names static
2011-02-17 15:14:21 -08:00
fat
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
freevxfs
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
fscache
Add a dummy printk function for the maintenance of unused printks
2010-08-12 09:51:35 -07:00
fuse
fuse: verify ioctl retries
2010-11-30 16:39:27 +01:00
gfs2
GFS2: Userland expects quota limit/warn/usage in 512b blocks
2010-11-19 11:20:29 +00:00
hfs
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
hfsplus
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
hostfs
convert get_sb_nodev() users
2010-10-29 04:16:31 -04:00
hpfs
Merge branches 'irq-core-for-linus' and 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-10-31 20:40:24 -04:00
hppfs
convert get_sb_nodev() users
2010-10-29 04:16:31 -04:00
hugetlbfs
hugetlbfs: lessen the impact of a deprecation warning
2010-11-12 07:55:32 -08:00
isofs
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
jbd
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6
2010-10-27 20:13:18 -07:00
jbd2
jbd2: fix /proc/fs/jbd2/<dev> when using an external journal
2010-11-17 21:46:26 -05:00
jffs2
Merge git://git.infradead.org/mtd-2.6
2010-10-30 08:31:35 -07:00
jfs
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
lockd
BKL: remove extraneous #include <smp_lock.h>
2010-11-17 08:59:32 -08:00
logfs
logfs: fix "Kernel BUG at readwrite.c:1193"
2010-12-22 19:43:33 -08:00
minix
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
ncpfs
BKL: remove extraneous #include <smp_lock.h>
2010-11-17 08:59:32 -08:00
nfs
NFS: Fix "kernel BUG at fs/aio.c:554!"
2011-02-17 15:14:14 -08:00
nfs_common
…
nfsd
nfsd4: name->id mapping should fail with BADOWNER not BADNAME
2011-02-17 15:14:14 -08:00
nilfs2
nilfs2: fix crash after one superblock became unavailable
2011-02-17 15:14:59 -08:00
nls
…
notify
fanotify: fill in the metadata_len field on struct fanotify_event_metadata
2010-12-15 13:58:18 -05:00
ntfs
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
ocfs2
Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2
2010-12-23 16:36:48 -08:00
omfs
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
openpromfs
sparc: fix openpromfs compile
2010-11-08 14:29:39 -08:00
partitions
block: fix accounting bug on cross partition merges
2011-02-17 15:14:17 -08:00
proc
/proc/kcore: fix seeking
2011-02-17 15:14:16 -08:00
qnx4
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
quota
quota: Fix possible oops in __dquot_initialize()
2010-10-28 01:30:06 +02:00
ramfs
convert get_sb_nodev() users
2010-10-29 04:16:31 -04:00
reiserfs
reiserfs: don't acquire lock recursively in reiserfs_acl_chmod
2010-12-02 14:51:15 -08:00
romfs
convert get_sb_mtd() users to ->mount()
2010-10-29 04:16:26 -04:00
squashfs
Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus
2010-10-29 08:48:58 -07:00
sysfs
convert sysfs
2010-10-29 04:17:08 -04:00
sysv
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
ubifs
convert ubifs
2010-10-29 04:16:36 -04:00
udf
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
ufs
new helper: mount_bdev()
2010-10-29 04:16:13 -04:00
xfs
xfs: log timestamp changes to the source inode in rename
2010-12-09 17:07:02 -06:00
aio.c
new helper: ihold()
2010-10-25 21:26:11 -04:00
anon_inodes.c
convert get_sb_pseudo() users
2010-10-29 04:16:33 -04:00
attr.c
check ATTR_SIZE contraints in inode_change_ok
2010-08-09 16:47:39 -04:00
bad_inode.c
bkl: Remove locked .ioctl file operation
2010-08-14 00:24:24 +02:00
binfmt_aout.c
Don't dump task struct in a.out core-dumps
2010-10-14 10:57:40 -07:00
binfmt_elf_fdpic.c
…
binfmt_elf.c
ARM: 6342/1: fix ASLR of PIE executables
2010-10-08 10:02:53 +01:00
binfmt_em86.c
…
binfmt_flat.c
…
binfmt_misc.c
convert get_sb_single() users
2010-10-29 04:16:28 -04:00
binfmt_script.c
Make do_execve() take a const filename pointer
2010-08-17 18:07:43 -07:00
binfmt_som.c
…
bio-integrity.c
fs/bio-integrity.c: return -ENOMEM on kmalloc failure
2010-08-23 13:36:59 +02:00
bio.c
bio: take care not overflow page count when mapping/copying user data
2010-11-10 14:40:43 +01:00
block_dev.c
BKL: remove extraneous #include <smp_lock.h>
2010-11-17 08:59:32 -08:00
buffer.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2010-10-26 17:58:44 -07:00
char_dev.c
Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl
2010-10-22 10:52:56 -07:00
compat_binfmt_elf.c
…
compat_ioctl.c
BKL: remove extraneous #include <smp_lock.h>
2010-11-17 08:59:32 -08:00
compat.c
exec: copy-and-paste the fixes into compat_do_execve() paths
2010-11-30 17:56:38 -08:00
dcache.c
fs: use RCU read side protection in d_validate
2010-10-25 21:26:13 -04:00
dcookies.c
…
direct-io.c
fs/direct-io.c: don't try to allocate more than BIO_MAX_PAGES in a bio
2011-02-17 15:14:51 -08:00
drop_caches.c
simplify checks for I_CLEAR/I_FREEING
2010-08-09 16:47:44 -04:00
eventfd.c
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
eventpoll.c
epoll: epoll_wait() should not use timespec_add_ns()
2011-02-17 15:14:39 -08:00
exec.c
install_special_mapping skips security_file_mmap check.
2010-12-15 12:30:36 -08:00
fcntl.c
fasync: Fix placement of FASYNC flag comment
2010-10-27 18:17:02 -07:00
fifo.c
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
file_table.c
fs: allow for more than 2^31 files
2010-10-26 16:52:15 -07:00
file.c
vfs: use kmalloc() to allocate fdmem if possible
2010-08-11 08:59:02 -07:00
filesystems.c
…
fs_struct.c
fs: fs_struct rwlock to spinlock
2010-08-18 08:35:46 -04:00
fs-writeback.c
writeback: avoid livelocking WB_SYNC_ALL writeback
2011-02-17 15:14:19 -08:00
generic_acl.c
vfs: update ctime when changing the file's permission by setfacl
2010-08-18 01:04:22 -04:00
inode.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2010-10-26 17:58:44 -07:00
internal.h
braino in internal.h
2010-10-29 05:49:13 -04:00
ioctl.c
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
2010-11-19 19:46:45 -08:00
ioprio.c
ioprio: grab rcu_read_lock in sys_ioprio_{set,get}()
2010-11-15 10:23:31 +01:00
Kconfig
Merge 'staging-next' to Linus's tree
2010-10-28 09:44:56 -07:00
Kconfig.binfmt
coredump: default CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS=y
2010-10-27 18:03:12 -07:00
libfs.c
convert get_sb_pseudo() users
2010-10-29 04:16:33 -04:00
locks.c
BKL: remove extraneous #include <smp_lock.h>
2010-11-17 08:59:32 -08:00
Makefile
Merge 'staging-next' to Linus's tree
2010-10-28 09:44:56 -07:00
mbcache.c
mbcache: Limit the maximum number of cache entries
2010-08-18 06:24:41 -04:00
mpage.c
…
namei.c
fanotify: if set by user unset FMODE_NONOTIFY before fsnotify_perm() is called
2010-12-07 16:14:21 -05:00
namespace.c
BKL: remove extraneous #include <smp_lock.h>
2010-11-17 08:59:32 -08:00
nfsctl.c
…
no-block.c
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
open.c
fix open/umount race
2010-10-29 04:14:56 -04:00
pipe.c
Un-inline get_pipe_info() helper function
2010-11-28 16:27:19 -08:00
pnode.c
fs: brlock vfsmount_lock
2010-08-18 08:35:48 -04:00
pnode.h
…
posix_acl.c
…
read_write.c
BKL: remove extraneous #include <smp_lock.h>
2010-11-17 08:59:32 -08:00
read_write.h
…
readdir.c
vfs: fix warning: 'dirent' is used uninitialized in this function
2010-08-09 20:45:05 -07:00
select.c
epoll: make epoll_wait() use the hrtimer range feature
2010-10-27 18:03:18 -07:00
seq_file.c
fs: take dcache_lock inside __d_path
2010-10-25 21:26:12 -04:00
signalfd.c
Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6
2010-10-26 10:13:10 -07:00
splice.c
Export 'get_pipe_info()' to other users
2010-11-28 14:09:57 -08:00
stack.c
…
stat.c
Mark arguments to certain syscalls as being const
2010-08-13 16:53:13 -07:00
statfs.c
add f_flags to struct statfs(64)
2010-08-09 16:48:44 -04:00
super.c
switch get_sb_ns() users
2010-10-29 04:17:03 -04:00
sync.c
get rid of file_fsync()
2010-08-09 16:47:43 -04:00
timerfd.c
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
utimes.c
Mark arguments to certain syscalls as being const
2010-08-13 16:53:13 -07:00
xattr_acl.c
…
xattr.c
…