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Xiaotian Feng a2ef990ab5 proc: fix null pointer deref in proc_pid_permission() 
get_proc_task() can fail to search the task and return NULL,
put_task_struct() will then bomb the kernel with following oops:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
  IP: [<ffffffff81217d34>] proc_pid_permission+0x64/0xe0
  PGD 112075067 PUD 112814067 PMD 0
  Oops: 0002 [#1] PREEMPT SMP

This is a regression introduced by commit 0499680a ("procfs: add hidepid=
and gid= mount options").  The kernel should return -ESRCH if
get_proc_task() failed.

Signed-off-by: Xiaotian Feng <dannyfeng@tencent.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Vasiliy Kulikov <segoon@openwall.com>
Cc: Stephen Wilson <wilsons@start.ca>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-01-12 20:13:02 -08:00
..
9p
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs
2012-01-10 15:09:01 -08:00
adfs
vfs: switch ->show_options() to struct dentry *
2012-01-06 23:19:54 -05:00
affs
affs: propagate umode_t
2012-01-03 22:55:04 -05:00
afs
switch ->create() to umode_t
2012-01-03 22:54:53 -05:00
autofs4
autofs4: deal with autofs4_write/autofs4_write races
2012-01-11 00:20:12 -05:00
befs
vfs: fix the stupidity with i_dentry in inode destructors
2012-01-03 22:52:40 -05:00
bfs
switch ->create() to umode_t
2012-01-03 22:54:53 -05:00
btrfs
Merge branch 'writeback-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux
2012-01-10 16:59:59 -08:00
cachefiles
fs: move code out of buffer.c
2012-01-03 22:54:07 -05:00
ceph
ceph: d_alloc_root() may fail
2012-01-09 16:36:12 -05:00
cifs
Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2012-01-08 12:19:57 -08:00
coda
coda: switch coda_cnode_make() to sane API as well, clean coda_lookup()
2012-01-10 11:13:16 -05:00
configfs
configfs: convert to umode_t
2012-01-03 22:54:57 -05:00
cramfs
Merge branches 'vfsmount-guts', 'umode_t' and 'partitions' into Z
2012-01-06 23:15:54 -05:00
debugfs
Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2012-01-08 12:19:57 -08:00
devpts
devpts: fix double-free on mount failure
2012-01-08 20:19:03 -05:00
dlm
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm
2012-01-10 14:55:55 -08:00
ecryptfs
vfs: switch ->show_options() to struct dentry *
2012-01-06 23:19:54 -05:00
efs
vfs: fix the stupidity with i_dentry in inode destructors
2012-01-03 22:52:40 -05:00
exofs
Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd
2012-01-09 12:51:01 -08:00
exportfs
vfs: Add open by file handle support
2011-03-15 02:21:44 -04:00
ext2
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2012-01-09 12:51:21 -08:00
ext3
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2012-01-09 12:51:21 -08:00
ext4
Merge branch 'for_linus' into for_linus_merged
2012-01-10 11:54:07 -05:00
fat
Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
2012-01-09 12:09:47 -08:00
freevxfs
fs: propagate umode_t, misc bits
2012-01-03 22:55:10 -05:00
fscache
FS-Cache: Fix __fscache_uncache_all_inode_pages()'s outer loop
2011-07-21 10:59:16 -07:00
fuse
vfs: switch ->show_options() to struct dentry *
2012-01-06 23:19:54 -05:00
gfs2
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm
2012-01-10 14:55:55 -08:00
hfs
vfs: switch ->show_options() to struct dentry *
2012-01-06 23:19:54 -05:00
hfsplus
hfsplus: creation of hidden dir on mount can fail
2012-01-10 17:48:52 -05:00
hostfs
vfs: switch ->show_options() to struct dentry *
2012-01-06 23:19:54 -05:00
hpfs
switch ->mknod() to umode_t
2012-01-03 22:54:54 -05:00
hppfs
vfs: for usbfs, etc. internal vfsmounts ->mnt_sb->s_root == ->mnt_root
2012-01-03 22:52:41 -05:00
hugetlbfs
hugetlbfs: propagate umode_t
2012-01-03 22:55:05 -05:00
isofs
isofs: inode leak on mount failure
2012-01-09 10:48:11 -05:00
jbd
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2012-01-09 12:51:21 -08:00
jbd2
Merge branch 'for_linus' into for_linus_merged
2012-01-10 11:54:07 -05:00
jffs2
MTD pull for 3.3
2012-01-10 13:45:22 -08:00
jfs
Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
2012-01-08 13:10:57 -08:00
lockd
vfs: prefer ->dentry->d_sb to ->mnt->mnt_sb
2012-01-06 23:16:53 -05:00
logfs
MTD pull for 3.3
2012-01-10 13:45:22 -08:00
minix
Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2012-01-08 12:19:57 -08:00
ncpfs
vfs: switch ->show_options() to struct dentry *
2012-01-06 23:19:54 -05:00
nfs
Merge branch 'nfs-for-3.3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
2012-01-10 14:57:40 -08:00
nfs_common
Fix common misspellings
2011-03-31 11:26:23 -03:00
nfsd
Merge branch 'nfs-for-3.3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
2012-01-10 14:57:40 -08:00
nilfs2
Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
2012-01-08 13:10:57 -08:00
nls
NLS: raname "maxlen" to "maxout" in UTF conversion routines
2011-11-26 19:58:47 -08:00
notify
vfs: move fsnotify junk to struct mount
2012-01-03 22:57:12 -05:00
ntfs
vfs: switch ->show_options() to struct dentry *
2012-01-06 23:19:54 -05:00
ocfs2
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm
2012-01-10 14:55:55 -08:00
omfs
omfs: propagate umode_t
2012-01-03 22:55:01 -05:00
openpromfs
vfs: fix the stupidity with i_dentry in inode destructors
2012-01-03 22:52:40 -05:00
proc
proc: fix null pointer deref in proc_pid_permission()
2012-01-12 20:13:02 -08:00
pstore
pstore: gracefully handle NULL pstore_info functions
2011-11-18 13:49:00 -08:00
qnx4
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2012-01-08 13:21:22 -08:00
quota
vfs: prefer ->dentry->d_sb to ->mnt->mnt_sb
2012-01-06 23:16:53 -05:00
ramfs
pohmelfs: propagate umode_t
2012-01-03 22:55:07 -05:00
reiserfs
reiserfs: don't lock root inode searching
2012-01-10 16:30:54 -08:00
romfs
MTD pull for 3.3
2012-01-10 13:45:22 -08:00
squashfs
vfs: fix the stupidity with i_dentry in inode destructors
2012-01-03 22:52:40 -05:00
sysfs
sysfs: propagate umode_t
2012-01-03 22:55:03 -05:00
sysv
vfs: prefer ->dentry->d_sb to ->mnt->mnt_sb
2012-01-06 23:16:53 -05:00
ubifs
Merge branch 'linux-next' of git://git.infradead.org/ubifs-2.6
2012-01-10 14:57:19 -08:00
udf
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2012-01-09 12:51:21 -08:00
ufs
vfs: switch ->show_options() to struct dentry *
2012-01-06 23:19:54 -05:00
xfs
Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
2012-01-09 12:50:15 -08:00
aio.c
aio: allocate kiocbs in batches
2011-11-02 16:07:03 -07:00
anon_inodes.c
vfs: dont chain pipe/anon/socket on superblock s_inodes list
2011-07-26 12:57:09 -04:00
attr.c
switch is_sxid() to umode_t
2012-01-03 22:55:11 -05:00
bad_inode.c
switch ->mknod() to umode_t
2012-01-03 22:54:54 -05:00
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
consolidate BINPRM_FLAGS_ENFORCE_NONDUMP handling
2011-07-20 01:43:10 -04:00
binfmt_elf.c
fs: binfmt_elf: create Kconfig variable for PIE randomization
2012-01-10 16:30:51 -08:00
binfmt_em86.c
…
binfmt_flat.c
CRED: Fix load_flat_shared_library() to initialise bprm correctly
2011-05-03 10:10:51 +10:00
binfmt_misc.c
vfs: prefer ->dentry->d_sb to ->mnt->mnt_sb
2012-01-06 23:16:53 -05:00
binfmt_script.c
…
binfmt_som.c
…
bio-integrity.c
fs: add export.h to files using EXPORT_SYMBOL/THIS_MODULE macros
2011-10-31 19:30:31 -04:00
bio.c
bio: change some signed vars to unsigned
2011-11-16 09:21:50 +01:00
block_dev.c
block_dev: Suppress bdev_cache_init() kmemleak warninig
2012-01-10 13:08:55 -05:00
buffer.c
fs: move code out of buffer.c
2012-01-03 22:54:07 -05:00
char_dev.c
char_dev.c: fix up some whitespace errors
2011-12-13 11:18:17 -08:00
compat_binfmt_elf.c
…
compat_ioctl.c
vfs: fix up ENOIOCTLCMD error handling
2012-01-05 15:40:12 -08:00
compat.c
switch open and mkdir syscalls to umode_t
2012-01-03 22:55:19 -05:00
dcache.c
fix shrink_dcache_parent() livelock
2012-01-10 13:06:32 -05:00
dcookies.c
oprofile, dcookies: Fix possible circular locking dependency
2011-05-31 16:33:35 +02:00
direct-io.c
direct-io: merge direct_io_walker into __blockdev_direct_IO
2011-10-28 14:58:58 +02:00
drop_caches.c
vmscan: change shrinker API by passing shrink_control struct
2011-05-25 08:39:26 -07:00
eventfd.c
Docbook: add fs/eventfd.c and fix typos in it
2011-02-21 15:07:04 -08:00
eventpoll.c
epoll: fix spurious lockdep warnings
2011-10-31 17:30:57 -07:00
exec.c
tracepoint: add tracepoints for debugging oom_score_adj
2012-01-10 16:30:44 -08:00
fcntl.c
userns: rename is_owner_or_cap to inode_owner_or_capable
2011-03-23 19:47:13 -07:00
fhandle.c
vfs: prefer ->dentry->d_sb to ->mnt->mnt_sb
2012-01-06 23:16:53 -05:00
fifo.c
Filesystem: fifo: Fixed coding style issue.
2011-03-21 00:16:09 -04:00
file_table.c
vfs: prevent remount read-only if pending removes
2012-01-06 23:20:13 -05:00
file.c
vfs: avoid large kmalloc()s for the fdtable
2011-04-28 11:28:20 -07:00
filesystems.c
vfs: convert fs_supers to hlist
2012-01-03 22:52:39 -05:00
fs_struct.c
sanitize vfsmount refcounting changes
2011-01-16 13:47:07 -05:00
fs-writeback.c
Merge branch 'writeback-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux
2012-01-10 16:59:59 -08:00
generic_acl.c
switch posix_acl_equiv_mode() to umode_t *
2011-08-01 02:10:06 -04:00
inode.c
mm: account reaped page cache on inode cache pruning
2012-01-10 16:30:42 -08:00
internal.h
vfs: protect remounting superblock read-only
2012-01-06 23:20:12 -05:00
ioctl.c
vfs: fix up ENOIOCTLCMD error handling
2012-01-05 15:40:12 -08:00
ioprio.c
fs: add export.h to files using EXPORT_SYMBOL/THIS_MODULE macros
2011-10-31 19:30:31 -04:00
Kconfig
Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd
2012-01-09 12:51:01 -08:00
Kconfig.binfmt
fs: binfmt_elf: create Kconfig variable for PIE randomization
2012-01-10 16:30:51 -08:00
libfs.c
fs: move code out of buffer.c
2012-01-03 22:54:07 -05:00
locks.c
vfs: fix handling of lock allocation failure in lease-break case
2011-12-26 10:25:26 -08:00
Makefile
Merge branches 'vfsmount-guts', 'umode_t' and 'partitions' into Z
2012-01-06 23:15:54 -05:00
mbcache.c
vmscan: change shrinker API by passing shrink_control struct
2011-05-25 08:39:26 -07:00
mount.h
vfs: keep list of mounts for each superblock
2012-01-06 23:20:12 -05:00
mpage.c
mm/fs: add hooks to support cleancache
2011-05-26 10:01:43 -06:00
namei.c
Merge branches 'vfsmount-guts', 'umode_t' and 'partitions' into Z
2012-01-06 23:15:54 -05:00
namespace.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2012-01-08 13:21:22 -08:00
no-block.c
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
open.c
switch security_path_chmod() to struct path *
2012-01-06 23:16:53 -05:00
pipe.c
vfs: pipe.c is really non-modular
2012-01-03 22:52:41 -05:00
pnode.c
vfs: switch pnode.h macros to struct mount *
2012-01-03 22:57:11 -05:00
pnode.h
vfs: switch pnode.h macros to struct mount *
2012-01-03 22:57:11 -05:00
posix_acl.c
vfs: pass all mask flags check_acl and posix_acl_permission
2011-10-28 14:58:54 +02:00
proc_namespace.c
vfs: switch ->show_options() to struct dentry *
2012-01-06 23:19:54 -05:00
read_write.c
Cross Memory Attach
2011-10-31 17:30:44 -07:00
read_write.h
…
readdir.c
…
select.c
select: remove unused MAX_SELECT_SECONDS
2011-03-21 00:16:08 -04:00
seq_file.c
constify seq_file stuff
2012-01-03 22:52:40 -05:00
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
fs: move code out of buffer.c
2012-01-03 22:54:07 -05:00
stack.c
filesystems: add set_nlink()
2011-11-02 12:53:43 +01:00
stat.c
readlinkat: ensure we return ENOENT for the empty pathname for normal lookups
2011-11-02 12:53:42 +01:00
statfs.c
vfs: new helper - vfs_ustat()
2012-01-03 22:53:07 -05:00
super.c
vfs: prevent remount read-only if pending removes
2012-01-06 23:20:13 -05:00
sync.c
fs: move code out of buffer.c
2012-01-03 22:54:07 -05:00
timerfd.c
timerfd: Fix wakeup of processes when timer is cancelled on clock change
2011-06-14 11:46:14 +02:00
utimes.c
userns: rename is_owner_or_cap to inode_owner_or_capable
2011-03-23 19:47:13 -07:00
xattr_acl.c
…
xattr.c
vfs: mnt_drop_write_file()
2012-01-03 22:52:40 -05:00