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Ying Hsu 06e2b5ad72 Bluetooth: Fix hci_suspend_sync crash 
[ Upstream commit 573ebae162 ]

If hci_unregister_dev() frees the hci_dev object but hci_suspend_notifier
may still be accessing it, it can cause the program to crash.
Here's the call trace:
  <4>[102152.653246] Call Trace:
  <4>[102152.653254]  hci_suspend_sync+0x109/0x301 [bluetooth]
  <4>[102152.653259]  hci_suspend_dev+0x78/0xcd [bluetooth]
  <4>[102152.653263]  hci_suspend_notifier+0x42/0x7a [bluetooth]
  <4>[102152.653268]  notifier_call_chain+0x43/0x6b
  <4>[102152.653271]  __blocking_notifier_call_chain+0x48/0x69
  <4>[102152.653273]  __pm_notifier_call_chain+0x22/0x39
  <4>[102152.653276]  pm_suspend+0x287/0x57c
  <4>[102152.653278]  state_store+0xae/0xe5
  <4>[102152.653281]  kernfs_fop_write+0x109/0x173
  <4>[102152.653284]  __vfs_write+0x16f/0x1a2
  <4>[102152.653287]  ? selinux_file_permission+0xca/0x16f
  <4>[102152.653289]  ? security_file_permission+0x36/0x109
  <4>[102152.653291]  vfs_write+0x114/0x21d
  <4>[102152.653293]  __x64_sys_write+0x7b/0xdb
  <4>[102152.653296]  do_syscall_64+0x59/0x194
  <4>[102152.653299]  entry_SYSCALL_64_after_hwframe+0x5c/0xc1

This patch holds the reference count of the hci_dev object while
processing it in hci_suspend_notifier to avoid potential crash
caused by the race condition.

Signed-off-by: Ying Hsu <yinghsu@chromium.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2023-09-23 11:11:02 +02:00
Documentation perf/smmuv3: Enable HiSilicon Erratum 162001900 quirk for HIP08/09 2023-09-23 11:11:00 +02:00
LICENSES
…
arch hw_breakpoint: fix single-stepping when using bpf_overflow_handler 2023-09-23 11:11:00 +02:00
block blk-throttle: consider 'carryover_ios/bytes' in throtl_trim_slice() 2023-09-19 12:28:00 +02:00
certs certs: Fix build error when PKCS#11 URI contains semicolon 2023-02-09 11:28:11 +01:00
crypto crypto: lrw,xts - Replace strlcpy with strscpy 2023-09-23 11:11:01 +02:00
drivers can: sun4i_can: Add support for the Allwinner D1 2023-09-23 11:11:02 +02:00
fs locks: fix KASAN: use-after-free in trace_event_raw_event_filelock_lock 2023-09-23 11:11:00 +02:00
include hw_breakpoint: fix single-stepping when using bpf_overflow_handler 2023-09-23 11:11:00 +02:00
init sched/psi: Select KERNFS as needed 2023-09-13 09:42:28 +02:00
io_uring io_uring: Don't set affinity on a dying sqpoll thread 2023-09-19 12:27:54 +02:00
ipc ipc: fix memory leak in init_mqueue_fs() 2022-12-31 13:32:01 +01:00
kernel scftorture: Forgive memory-allocation failure if KASAN 2023-09-23 11:11:00 +02:00
lib crypto: lib/mpi - avoid null pointer deref in mpi_cmp_ui() 2023-09-23 11:11:02 +02:00
mm Multi-gen LRU: avoid race in inc_min_seq() 2023-09-19 12:28:04 +02:00
net Bluetooth: Fix hci_suspend_sync crash 2023-09-23 11:11:02 +02:00
rust rust: allocator: Prevent mis-aligned allocation 2023-08-11 12:08:18 +02:00
samples samples/bpf: fix broken map lookup probe 2023-09-13 09:42:34 +02:00
scripts kconfig: fix possible buffer overflow 2023-09-19 12:27:59 +02:00
security smackfs: Prevent underflow in smk_set_cipso() 2023-09-13 09:42:42 +02:00
sound ASoC: tegra: Fix SFC conversion for few rates 2023-09-19 12:27:56 +02:00
tools selftests/nolibc: fix up kernel parameters support 2023-09-23 11:11:00 +02:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt kvm/vfio: ensure kvg instance stays around in kvm_vfio_group_add() 2023-09-13 09:42:46 +02:00
.clang-format inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
.cocciconfig
…
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes
…
.gitignore Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
.mailmap 9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address 2022-12-10 17:10:52 -08:00
.rustfmt.toml rust: add `.rustfmt.toml` 2022-09-28 09:02:20 +02:00
COPYING
…
CREDITS MAINTAINERS: Remove Michal Marek from Kbuild maintainers 2022-11-16 14:53:00 +09:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig
…
MAINTAINERS devlink: move code to a dedicated directory 2023-08-30 16:11:00 +02:00
Makefile Linux 6.1.54 2023-09-19 12:28:10 +02:00
README
…

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.