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Lin Ma d07847d974 nfc/nci: fix race with opening and closing 
[ Upstream commit 0ad6bded17 ]

Previously we leverage NCI_UNREG and the lock inside nci_close_device to
prevent the race condition between opening a device and closing a
device. However, it still has problem because a failed opening command
will erase the NCI_UNREG flag and allow another opening command to
bypass the status checking.

This fix corrects that by making sure the NCI_UNREG is held.

Reported-by: syzbot+43475bf3cfbd6e41f5b7@syzkaller.appspotmail.com
Fixes: 48b71a9e66 ("NFC: add NCI_UNREG flag to eliminate the race")
Signed-off-by: Lin Ma <linma@zju.edu.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2022-12-02 17:43:04 +01:00
Documentation docs/driver-api/miscellaneous: Remove kernel-doc of serial_core.c 2022-11-26 09:27:51 +01:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
arch ARM: dts: at91: sam9g20ek: enable udc vbus gpio pinctrl 2022-12-02 17:43:03 +01:00
block block, bfq: fix null pointer dereference in bfq_bio_bfqg() 2022-12-02 17:43:01 +01:00
certs certs: make system keyring depend on built-in x509 parser 2022-09-24 04:31:18 +09:00
crypto crypto: akcipher - default implementation for setting a private key 2022-10-21 12:38:59 +02:00
drivers net: dsa: sja1105: disallow C45 transactions on the BASE-TX MDIO bus 2022-12-02 17:43:04 +01:00
fs ceph: fix NULL pointer dereference for req->r_session 2022-12-02 17:42:59 +01:00
include net: neigh: decrement the family specific qlen 2022-12-02 17:43:04 +01:00
init arm64 fixes for -rc3 2022-08-26 11:32:53 -07:00
io_uring io_uring/poll: lockdep annote io_poll_req_insert_locked 2022-12-02 17:43:02 +01:00
ipc ipc: mqueue: fix possible memory leak in init_mqueue_fs() 2022-10-21 12:38:55 +02:00
kernel bpf: Prevent bpf program recursion for raw tracepoint probes 2022-11-26 09:27:56 +01:00
lib lib/Kconfig.debug: Add check for non-constant .{s,u}leb128 support to DWARF5 2022-10-21 12:39:29 +02:00
mm mm: fs: initialize fsdata passed to write_begin/write_end interface 2022-11-26 09:27:56 +01:00
net nfc/nci: fix race with opening and closing 2022-12-02 17:43:04 +01:00
samples Tracing updates for 5.20 / 6.0 2022-08-05 09:41:12 -07:00
scripts kbuild: rpm-pkg: fix breakage when V=1 is used 2022-10-21 12:39:01 +02:00
security capabilities: fix potential memleak on error path from vfs_getxattr_alloc() 2022-11-10 18:17:33 +01:00
sound ASoC: max98373: Add checks for devm_kcalloc 2022-12-02 17:43:03 +01:00
tools selftests: mptcp: fix mibit vs mbit mix up 2022-12-02 17:43:03 +01:00
usr Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
virt KVM: debugfs: Return retval of simple_attr_open() if it fails 2022-11-16 10:03:48 +01:00
.clang-format PCI/DOE: Add DOE mailbox support functions 2022-07-19 15:38:04 -07:00
.cocciconfig
…
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore kbuild: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
.mailmap Qualcomm ARM64 DTS fixes for 6.0 2022-09-23 16:44:37 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS drm for 5.20/6.0 2022-08-03 19:52:08 -07:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS One MAINTAINERS update, two MM fixes, both cc:stable 2022-10-01 09:13:29 -07:00
Makefile Linux 6.0.10 2022-11-26 09:27:56 +01:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.