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Penglei Jiang 65c6604725 proc: fix the issue of proc_mem_open returning NULL 
proc_mem_open() can return an errno, NULL, or mm_struct*.  If it fails to
acquire mm, it returns NULL, but the caller does not check for the case
when the return value is NULL.

The following conditions lead to failure in acquiring mm:

  - The task is a kernel thread (PF_KTHREAD)
  - The task is exiting (PF_EXITING)

Changes:

  - Add documentation comments for the return value of proc_mem_open().
  - Add checks in the caller to return -ESRCH when proc_mem_open()
    returns NULL.

Link: https://lkml.kernel.org/r/20250404063357.78891-1-superman.xpt@gmail.com
Reported-by: syzbot+f9238a0a31f9b5603fef@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/000000000000f52642060d4e3750@google.com
Signed-off-by: Penglei Jiang <superman.xpt@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Adrian Ratiu <adrian.ratiu@collabora.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Felix Moessbauer <felix.moessbauer@siemens.com>
Cc: Jeff layton <jlayton@kernel.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mateusz Guzik <mjguzik@gmail.com>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: xu xin <xu.xin16@zte.com.cn>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2025-05-11 17:54:05 -07:00
..
9p 9p update for 6.15-rc1 2025-04-03 15:35:46 -07:00
adfs Merge patch series "adfs, affs, befs, hfs, hfsplus: convert to new mount api" 2024-10-08 14:41:53 +02:00
affs vfs-6.15-rc1.async.dir 2025-03-24 10:47:14 -07:00
afs afs: Fix afs_dynroot_readdir() to not use the RCU read lock 2025-04-11 15:24:29 +02:00
autofs vfs-6.15-rc1.async.dir 2025-03-24 10:47:14 -07:00
bcachefs bcachefs: Don't aggressively discard the journal 2025-05-07 17:10:10 -04:00
befs befs: convert befs to use the new mount api 2024-09-18 11:44:43 +02:00
bfs
btrfs for-6.15-rc5-tag 2025-05-06 08:19:09 -07:00
cachefiles gcc-15: add '__nonstring' markers to byte arrays 2025-04-20 11:57:54 -07:00
ceph A small CephFS encryption-related fix and a dead code cleanup. 2025-04-25 15:51:28 -07:00
coda Change inode_operations.mkdir to return struct dentry * 2025-02-27 20:00:17 +01:00
configfs Change inode_operations.mkdir to return struct dentry * 2025-02-27 20:00:17 +01:00
cramfs
crypto for-6.15/block-20250322 2025-03-26 18:08:55 -07:00
debugfs debugfs: Fix the missing initializations in __debugfs_file_get() 2025-01-30 08:22:31 +01:00
devpts devpts: Fix type for uid and gid params 2025-04-07 15:22:12 +02:00
dlm dlm: make tcp still work in multi-link env 2025-03-18 10:49:22 -05:00
ecryptfs vfs-6.15-rc1.async.dir 2025-03-24 10:47:14 -07:00
efivarfs EFI updates for v6.15 2025-03-29 11:36:19 -07:00
efs efs: fix the efs new mount api implementation 2024-10-15 15:58:36 +02:00
erofs erofs: ensure the extra temporary copy is valid for shortened bvecs 2025-05-07 09:50:51 +08:00
exfat exfat: call bh_read in get_block only when necessary 2025-03-29 22:03:11 +09:00
exportfs exportfs: add module description 2025-03-25 15:57:58 +01:00
ext2 \n 2025-03-31 17:53:44 -07:00
ext4 mm/migrate: fix sleep in atomic for large folios and buffer heads 2025-04-22 18:16:08 +02:00
f2fs f2fs-for-6.15-rc1 2025-03-27 12:55:54 -07:00
fat Change inode_operations.mkdir to return struct dentry * 2025-02-27 20:00:17 +01:00
freevxfs freevxfs: Replace one-element array with flexible array member 2024-11-06 10:42:06 +01:00
fuse virtiofs: add filesystem context source name check 2025-04-07 15:22:25 +02:00
gfs2 lib/crc: remove CONFIG_LIBCRC32C 2025-04-04 11:31:42 -07:00
hfs Revert "hfs{plus}: add deprecation warning" 2025-04-19 22:48:59 +02:00
hfsplus Revert "hfs{plus}: add deprecation warning" 2025-04-19 22:48:59 +02:00
hostfs Updates for UML for this cycle, notably: 2025-04-02 12:25:03 -07:00
hpfs Change inode_operations.mkdir to return struct dentry * 2025-02-27 20:00:17 +01:00
hugetlbfs - The 6 patch series "Enable strict percpu address space checks" from 2025-04-01 09:29:18 -07:00
iomap iomap: skip unnecessary ifs_block_is_uptodate check 2025-04-11 16:02:27 +02:00
isofs isofs: Prevent the use of too small fid 2025-04-04 12:28:32 +02:00
jbd2 fs/jbd2: use sleeping version of __find_get_block() 2025-04-22 18:16:08 +02:00
jffs2 treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
jfs Various bug fixes and cleanups for JFS 2025-03-27 13:17:39 -07:00
kernfs Driver core updates for 6.15-rc1 2025-04-01 11:02:03 -07:00
lockd sysctl: Fixes nsm_local_state bounds 2025-03-10 09:11:13 -04:00
minix Change inode_operations.mkdir to return struct dentry * 2025-02-27 20:00:17 +01:00
netfs netfs: Mark __nonstring lookup tables 2025-04-17 10:13:46 +02:00
nfs nfsd-6.15 fixes: 2025-04-19 10:38:03 -07:00
nfs_common fs: nfs: acl: Avoid -Wflex-array-member-not-at-end warning 2025-03-10 09:11:04 -04:00
nfsd nfsd-6.15 fixes: 2025-04-19 10:38:03 -07:00
nilfs2 nilfs2: fix deadlock warnings caused by lock dependency in init_nilfs() 2025-05-07 23:39:42 -07:00
nls move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
notify fanotify: fix flush of mntns marks 2025-04-24 10:58:59 +02:00
ntfs3 Changes for 6.15-rc1 2025-04-02 16:30:02 -07:00
ocfs2 ocfs2: stop quota recovery before disabling quotas 2025-05-07 23:39:40 -07:00
omfs Change inode_operations.mkdir to return struct dentry * 2025-02-27 20:00:17 +01:00
openpromfs
orangefs orangefs: one fixup 2025-03-27 13:14:39 -07:00
overlayfs ovl: remove unused forward declaration 2025-04-07 11:22:49 +02:00
proc proc: fix the issue of proc_mem_open returning NULL 2025-05-11 17:54:05 -07:00
pstore treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
qnx4
qnx6 fs/qnx6: Fix building with GCC 15 2024-12-03 10:40:36 +01:00
quota treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
ramfs Change inode_operations.mkdir to return struct dentry * 2025-02-27 20:00:17 +01:00
romfs
smb two smb3 client fixes 2025-05-09 16:45:21 -07:00
squashfs squashfs: fix invalid pointer dereference in squashfs_cache_delete 2025-03-16 17:40:24 -07:00
sysfs kernfs: Use RCU to access kernfs_node::name. 2025-02-15 17:46:32 +01:00
tests
tracefs Change inode_operations.mkdir to return struct dentry * 2025-02-27 20:00:17 +01:00
ubifs This update includes the following changes: 2025-03-29 10:01:55 -07:00
udf - The 6 patch series "Enable strict percpu address space checks" from 2025-04-01 09:29:18 -07:00
ufs Change inode_operations.mkdir to return struct dentry * 2025-02-27 20:00:17 +01:00
unicode unicode: kunit: change tests filename and path 2025-02-12 14:00:11 -08:00
vboxsf vfs-6.15-rc1.async.dir 2025-03-24 10:47:14 -07:00
verity Revert "fsverity: relax build time dependency on CRYPTO_SHA256" 2025-02-17 11:34:15 -08:00
xfs XFS: fix zoned gc threshold math for 32-bit arches 2025-04-22 16:03:14 +02:00
zonefs iomap: pass private data to iomap_page_mkwrite 2025-02-06 13:02:15 +01:00
aio.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
anon_inodes.c add a string-to-qstr constructor 2025-01-27 19:25:45 -05:00
attr.c fs: handle delegated timestamps in setattr_copy_mgtime 2024-10-10 10:20:51 +02:00
backing-file.c tree-wide: s/revert_creds_light()/revert_creds()/g 2024-12-02 11:25:09 +01:00
bad_inode.c Change inode_operations.mkdir to return struct dentry * 2025-02-27 20:00:17 +01:00
binfmt_elf.c binfmt_elf: Use note name macros 2025-02-10 16:47:07 -08:00
binfmt_elf_fdpic.c binfmt_elf_fdpic: fix variable set but not used warning 2025-03-07 20:07:33 -08:00
binfmt_flat.c binfmt_flat: Fix integer overflow bug on 32 bit systems 2025-01-10 08:49:05 -08:00
binfmt_misc.c execve updates for v6.14-rc1 2025-01-20 13:27:58 -08:00
binfmt_script.c
bpf_fs_kfuncs.c bpf: fs/xattr: Add BPF kfuncs to set and remove xattrs 2025-02-13 19:35:32 -08:00
buffer.c mm/migrate: fix sleep in atomic for large folios and buffer heads 2025-04-22 18:16:08 +02:00
char_dev.c fs: Reorganize kerneldoc parameter names 2024-10-22 11:16:57 +02:00
compat_binfmt_elf.c binfmt_elf: Wire up AT_HWCAP3 at AT_HWCAP4 2024-10-17 18:38:49 +01:00
coredump.c Summary 2025-03-26 21:02:05 -07:00
d_path.c
dax.c fs/dax: fix folio splitting issue by resetting old folio order + _nr_pages 2025-04-17 20:10:06 -07:00
dcache.c Summary 2025-03-26 21:02:05 -07:00
direct-io.c
drop_caches.c fs: drop_caches: move sysctl to fs/drop_caches.c 2025-02-07 16:53:04 +01:00
eventfd.c make use of anon_inode_getfile_fmode() 2025-02-21 10:25:31 +01:00
eventpoll.c eventpoll: Set epoll timeout if it's in the future 2025-04-17 09:56:20 +02:00
exec.c rseq: Eliminate useless task_work on execve 2025-04-03 13:10:47 +02:00
fcntl.c fs: get rid of __FMODE_NONOTIFY kludge 2024-12-09 11:34:29 +01:00
fhandle.c exportfs: add permission method 2024-12-17 09:16:11 +01:00
file.c fs: fall back to file_ref_put() for non-last reference 2025-04-22 18:16:09 +02:00
file_table.c vfs-6.15-rc1.file 2025-03-24 13:19:17 -07:00
filesystems.c
fs-writeback.c fs: fs-writeback: move sysctl to fs/fs-writeback.c 2025-02-07 16:53:04 +01:00
fs_context.c fs: fc_log replace magic number 7 with ARRAY_SIZE() 2024-12-22 11:29:52 +01:00
fs_parser.c bcachefs: add support for true/false & yes/no in bool-type options 2024-12-21 01:36:17 -05:00
fs_pin.c
fs_struct.c
fs_types.c
fsopen.c fs: support O_PATH fds with FSCONFIG_SET_FD 2025-02-12 10:02:10 +01:00
init.c VFS: Change vfs_mkdir() to return the dentry. 2025-03-05 11:52:50 +01:00
inode.c fs: call inode_sb_list_add() outside of inode hash lock 2025-03-20 13:06:51 +01:00
internal.h vfs-6.15-rc1.file 2025-03-24 13:19:17 -07:00
ioctl.c ioctl: Fix return type of several functions from long to int 2025-02-21 10:25:32 +01:00
Kconfig nfsd-6.15 fixes: 2025-04-19 10:38:03 -07:00
Kconfig.binfmt
kernel_read_file.c fdget(), trivial conversions 2024-11-03 01:28:06 -05:00
libfs.c vfs-6.15-rc1.pidfs 2025-03-24 10:16:37 -07:00
locks.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
Makefile sysv: Remove the filesystem 2025-02-21 10:32:47 +01:00
mbcache.c
mnt_idmapping.c statmount: allow to retrieve idmappings 2025-02-12 12:12:27 +01:00
mount.h vfs-6.15-rc1.mount.namespace 2025-03-24 11:41:41 -07:00
mpage.c fs/buffer fs/mpage: remove large folio restriction 2025-02-24 11:44:44 +01:00
namei.c fs: ensure that *path_locked*() helpers leave passed path pristine 2025-04-16 09:33:09 +02:00
namespace.c fix IS_MNT_PROPAGATING uses 2025-05-09 18:06:27 -04:00
nsfs.c vfs-6.15-rc1.nsfs 2025-03-24 11:38:12 -07:00
open.c vfs-6.15-rc1.file 2025-03-24 13:19:17 -07:00
pidfs.c vfs-6.15-rc1.pidfs 2025-03-24 10:16:37 -07:00
pipe.c Merge patch series "pipe: Trivial cleanups" 2025-03-10 08:55:13 +01:00
pnode.c fix IS_MNT_PROPAGATING uses 2025-05-09 18:06:27 -04:00
pnode.h fix IS_MNT_PROPAGATING uses 2025-05-09 18:06:27 -04:00
posix_acl.c acl: Annotate struct posix_acl with __counted_by() 2024-10-22 11:16:59 +02:00
proc_namespace.c
read_write.c fs: don't needlessly acquire f_lock 2025-02-21 10:25:32 +01:00
readdir.c introduce "fd_pos" class, convert fdget_pos() users to it. 2024-11-03 01:28:06 -05:00
remap_range.c convert vfs_dedupe_file_range(). 2024-11-03 01:28:07 -05:00
select.c select: Fix unbalanced user_access_end() 2025-01-13 16:24:16 +01:00
seq_file.c fs: Reorganize kerneldoc parameter names 2024-10-22 11:16:57 +02:00
signalfd.c make use of anon_inode_getfile_fmode() 2025-02-21 10:25:31 +01:00
splice.c splice: remove duplicate noinline from pipe_clear_nowait 2025-04-25 12:11:56 +02:00
stack.c
stat.c fs: move the bdex_statx call to vfs_getattr_nosec 2025-04-17 10:14:34 +02:00
statfs.c fdget_raw() users: switch to CLASS(fd_raw) 2024-11-03 01:28:06 -05:00
super.c vfs-6.15-rc1.misc 2025-03-24 09:13:50 -07:00
sync.c fdget(), trivial conversions 2024-11-03 01:28:06 -05:00
sysctls.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
timerfd.c A treewide hrtimer timer cleanup 2025-03-25 10:54:15 -07:00
userfaultfd.c mm/userfaultfd: fix uninitialized output field for -EAGAIN race 2025-05-07 23:39:39 -07:00
utimes.c fdget(), more trivial conversions 2024-11-03 01:28:06 -05:00
xattr.c fs/xattr: Fix handling of AT_FDCWD in setxattrat(2) and getxattrat(2) 2025-04-25 12:11:56 +02:00