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d4bbe7068b
linux-next/fs
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Ross Zwisler d4bbe7068b dax: fix NULL pointer dereference in __dax_dbg() 
In __dax_pmd_fault() we currently assume that get_block() will always
set bh.b_bdev and we unconditionally dereference it in __dax_dbg().

This assumption isn't always true - when called for reads of holes
ext4_dax_mmap_get_block() returns a buffer head where bh->b_bdev is
never set.  I hit this BUG while testing the DAX PMD fault path.

Instead, initialize bh.b_bdev before passing bh into get_block().  It is
possible that the filesystem's get_block() will update bh.b_bdev, and
this is fine - we just want to initialize bh.b_bdev to something
reasonable so that the calls to __dax_dbg() work and print something
useful.

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reported-by: Dan Williams <dan.j.williams@intel.com>
Cc: Jan Kara <jack@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-01-22 17:02:18 -08:00
..
9p kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
adfs fs/adfs/adfs.h: tidy up comments 2016-01-20 17:09:18 -08:00
affs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
afs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
autofs4 switch ->get_link() to delayed_call, kill ->put_link() 2015-12-30 13:01:03 -05:00
befs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
bfs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
btrfs Merge branch 'for-linus-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2016-01-22 11:49:21 -08:00
cachefiles convert a bunch of open-coded instances of memdup_user_nul() 2016-01-04 10:26:58 -05:00
ceph kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
cifs page-flags: define PG_locked behavior on compound pages 2016-01-15 17:56:32 -08:00
coda kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
configfs Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2016-01-20 17:20:53 -08:00
cramfs don't put symlink bodies in pagecache into highmem 2015-12-08 22:41:36 -05:00
debugfs debugfs: fix refcount imbalance in start_creating 2015-11-11 02:04:44 -05:00
devpts
dlm [regression] fix braino in fs/dlm/user.c 2016-01-21 17:45:15 -05:00
ecryptfs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
efivarfs
efs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
exofs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
exportfs
ext2 kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
ext4 Some locking and page fault bug fixes from Jan Kara, some ext4 2016-01-22 11:23:35 -08:00
f2fs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
fat fat: constify fatent_operations structures 2016-01-20 17:09:18 -08:00
freevxfs don't put symlink bodies in pagecache into highmem 2015-12-08 22:41:36 -05:00
fscache FS-Cache: Handle a write to the page immediately beyond the EOF marker 2015-11-11 02:11:02 -05:00
fuse Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse 2016-01-21 12:14:24 -08:00
gfs2 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2016-01-17 19:13:15 -08:00
hfs fs/hfs/catalog.c: use list_for_each_entry in hfs_cat_delete 2016-01-20 17:09:18 -08:00
hfsplus kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
hostfs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
hpfs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
hugetlbfs mm/hugetlbfs: unmap pages if page fault raced with hole punch 2016-01-15 17:56:32 -08:00
isofs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
jbd2 fs: use block_device name vsprintf helper 2016-01-06 13:03:18 -05:00
jffs2 kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
jfs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
kernfs Revert "kernfs: do not account ino_ida allocations to memcg" 2016-01-14 16:00:49 -08:00
lockd lockd: constify nlmsvc_binding structure 2016-01-07 10:10:50 -05:00
logfs Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2016-01-20 09:45:43 -08:00
minix kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
ncpfs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
nfs Merge branch 'akpm' (patches from Andrew) 2016-01-15 11:41:44 -08:00
nfs_common lockd: NLM grace period shouldn't block NFSv4 opens 2015-08-13 10:22:06 -04:00
nfsd Smaller bugfixes and cleanup, including a fix for a failures of 2016-01-15 12:49:44 -08:00
nilfs2 kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
nls
notify fsnotify: destroy marks with call_srcu instead of dedicated thread 2016-01-14 16:00:49 -08:00
ntfs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
ocfs2 ocfs2: NFS hangs in __ocfs2_cluster_lock due to race with ocfs2_unblock_lock 2016-01-21 17:20:51 -08:00
omfs
openpromfs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
overlayfs Merge branch 'akpm' (patches from Andrew) 2016-01-21 12:32:08 -08:00
proc thp: change pmd_trans_huge_lock() interface to return ptl 2016-01-21 17:20:51 -08:00
pstore pstore: fix code comment to match code 2015-11-02 13:41:52 -08:00
qnx4 kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
qnx6 kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
quota quota: constify qtree_fmt_operations structures 2016-01-04 10:58:35 +01:00
ramfs don't put symlink bodies in pagecache into highmem 2015-12-08 22:41:36 -05:00
reiserfs reiserfs: fix dereference of ERR_PTR 2016-01-21 17:20:51 -08:00
romfs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
squashfs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
sysfs platform/chrome: Branch for v4.4 2015-11-13 21:53:18 -08:00
sysv kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
tracefs tracefs: Fix refcount imbalance in start_creating() 2015-11-04 22:13:45 -05:00
ubifs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
udf Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs 2016-01-15 11:51:51 -08:00
ufs kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
xfs xfs: Update 2 for 4.5-rc1 2016-01-22 10:54:13 -08:00
aio.c mm: move ->mremap() from file_operations to vm_operations_struct 2015-09-04 16:54:41 -07:00
anon_inodes.c
attr.c
bad_inode.c fs/bad_inode.c: is_bad_inode can be boolean 2015-12-06 21:17:14 -05:00
binfmt_aout.c
binfmt_elf_fdpic.c libnvdimm for 4.4: 2015-11-10 12:07:22 -08:00
binfmt_elf.c Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-11-11 09:45:24 -08:00
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
block_dev.c Merge branch 'for-4.5/core' of git://git.kernel.dk/linux-block 2016-01-19 15:03:34 -08:00
buffer.c fs: use block_device name vsprintf helper 2016-01-06 13:03:18 -05:00
char_dev.c
compat_binfmt_elf.c
compat_ioctl.c Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-01-12 17:11:47 -08:00
compat.c saner calling conventions for copy_mount_options() 2016-01-04 10:28:32 -05:00
coredump.c fs/coredump: prevent "" / "." / ".." core path components 2016-01-20 17:09:18 -08:00
dax.c dax: fix NULL pointer dereference in __dax_dbg() 2016-01-22 17:02:18 -08:00
dcache.c kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
dcookies.c
direct-io.c fix the regression from "direct-io: Fix negative return from dio read beyond eof" 2015-12-08 15:02:42 -05:00
drop_caches.c inode: convert inode_sb_list_lock to per-sb 2015-08-17 18:39:46 -04:00
eventfd.c Documentation: filesystem: Fix typo in fs/eventfd.c 2015-12-08 14:52:03 +01:00
eventpoll.c epoll: add EPOLLEXCLUSIVE flag 2016-01-20 17:09:18 -08:00
exec.c don't carry MAY_OPEN in op->acc_mode 2016-01-04 10:28:40 -05:00
fcntl.c fcntl: allow to set O_DIRECT flag on pipe 2016-01-09 02:55:37 -05:00
fhandle.c
file_table.c
file.c kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
filesystems.c find_filesystem(): simplify comparison 2016-01-19 12:02:23 -05:00
fs_pin.c
fs_struct.c
fs-writeback.c cgroup, memcg, writeback: drop spurious rcu locking around mem_cgroup_css_from_page() 2016-01-15 17:56:32 -08:00
inode.c kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
internal.h Merge branch 'for-linus' into work.misc 2016-01-08 21:20:11 -05:00
ioctl.c Merge branch 'work.copy_file_range' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-01-12 16:30:34 -08:00
Kconfig dax: re-enable dax pmd mappings 2016-01-15 17:56:32 -08:00
Kconfig.binfmt
libfs.c switch ->get_link() to delayed_call, kill ->put_link() 2015-12-30 13:01:03 -05:00
locks.c Merge branch 'work.copy_file_range' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-01-12 16:30:34 -08:00
Makefile ext4: promote ext4 over ext2 in the default probe order 2015-10-15 10:33:21 -04:00
mbcache.c
mount.h
mpage.c mm, fs: introduce mapping_gfp_constraint() 2015-11-06 17:50:42 -08:00
namei.c Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-01-12 17:11:47 -08:00
namespace.c Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-01-12 17:11:47 -08:00
no-block.c
nsfs.c fs/seq_file: convert int seq_vprint/seq_printf/etc... returns to void 2015-09-11 15:21:34 -07:00
open.c don't carry MAY_OPEN in op->acc_mode 2016-01-04 10:28:40 -05:00
pipe.c pipe: limit the per-user amount of pages allocated in pipes 2016-01-19 19:25:21 -05:00
pnode.c
pnode.h
posix_acl.c xattr handlers: Simplify list operation 2015-12-13 19:46:12 -05:00
proc_namespace.c vfs: show_vfsstat: remove redundant initialization and check of error code 2015-12-06 21:17:16 -05:00
read_write.c Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-01-12 17:11:47 -08:00
readdir.c
select.c poll: plug an unused argument to do_poll 2016-01-06 08:26:52 -05:00
seq_file.c fs, seqfile: always allow oom killer 2015-11-06 17:50:42 -08:00
signalfd.c
splice.c fs: __generic_file_splice_read retry lookup on AOP_TRUNCATED_PAGE 2016-01-09 02:55:35 -05:00
stack.c
stat.c fs/stat.c: drop the last new_valid_dev check 2016-01-16 11:17:23 -08:00
statfs.c
super.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2016-01-14 17:04:19 -08:00
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
userfaultfd.c userfaultfd: revert "userfaultfd: waitqueue: add nr wake parameter to __wake_up_locked_key" 2015-09-22 15:09:53 -07:00
utimes.c
xattr.c Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-01-12 17:11:47 -08:00