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Duoming Zhou c33b2afffe NFC: netlink: fix sleep in atomic bug when firmware download timeout 
commit 4071bf121d upstream.

There are sleep in atomic bug that could cause kernel panic during
firmware download process. The root cause is that nlmsg_new with
GFP_KERNEL parameter is called in fw_dnld_timeout which is a timer
handler. The call trace is shown below:

BUG: sleeping function called from invalid context at include/linux/sched/mm.h:265
Call Trace:
kmem_cache_alloc_node
__alloc_skb
nfc_genl_fw_download_done
call_timer_fn
__run_timers.part.0
run_timer_softirq
__do_softirq
...

The nlmsg_new with GFP_KERNEL parameter may sleep during memory
allocation process, and the timer handler is run as the result of
a "software interrupt" that should not call any other function
that could sleep.

This patch changes allocation mode of netlink message from GFP_KERNEL
to GFP_ATOMIC in order to prevent sleep in atomic bug. The GFP_ATOMIC
flag makes memory allocation operation could be used in atomic context.

Fixes: 9674da8759 ("NFC: Add firmware upload netlink command")
Fixes: 9ea7187c53 ("NFC: netlink: Rename CMD_FW_UPLOAD to CMD_FW_DOWNLOAD")
Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220504055847.38026-1-duoming@zju.edu.cn
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-05-12 12:17:09 +02:00
arch parisc: Merge model and model name into one line in /proc/cpuinfo 2022-05-12 12:17:08 +02:00
block block/compat_ioctl: fix range check in BLKGETSIZE 2022-04-27 13:15:31 +02:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-22 11:45:19 +02:00
crypto crypto: authenc - Fix sleep in atomic context in decrypt_tail 2022-04-20 09:08:12 +02:00
Documentation Documentation: update stable tree link 2022-04-20 09:08:09 +02:00
drivers nfc: nfcmrvl: main: reorder destructive operations in nfcmrvl_nci_unregister_dev to avoid bugs 2022-05-12 12:17:09 +02:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:20:30 +01:00
fs cifs: destage any unwritten data to the server before calling copychunk_write 2022-05-12 12:17:07 +02:00
include tcp: fix potential xmit stalls caused by TCP_NOTSENT_LOWAT 2022-05-12 12:17:07 +02:00
init init/main.c: return 1 from handled __setup() functions 2022-04-20 09:08:28 +02:00
ipc ipc: WARN if trying to remove ipc object which is absent 2021-12-08 08:46:53 +01:00
kernel tracing: Dump stacktrace trigger to the corresponding instance 2022-04-27 13:15:29 +02:00
lib hex2bin: fix access beyond string end 2022-05-12 12:17:06 +02:00
mm mm: page_alloc: fix building error on -Werror=array-compare 2022-04-27 13:15:29 +02:00
net NFC: netlink: fix sleep in atomic bug when firmware download timeout 2022-05-12 12:17:09 +02:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-26 11:40:31 +01:00
scripts gcc-plugins: latent_entropy: use /dev/urandom 2022-04-20 09:08:32 +02:00
security Fix incorrect type in assignment of ipv6 port for audit 2022-04-20 09:08:21 +02:00
sound ASoC: wm8958: Fix change notifications for DSP controls 2022-05-12 12:17:09 +02:00
tools tools build: Use $(shell ) instead of `` to get embedded libperl's ccopts 2022-04-20 09:08:30 +02:00
usr initramfs: restore default compression behavior 2020-04-13 10:34:19 +02:00
virt KVM: Prevent module exit until all VMs are freed 2022-04-20 09:08:24 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore kbuild: rpm-pkg: keep spec file until make mrproper 2018-02-13 10:19:46 +01:00
.mailmap .mailmap: Add Maciej W. Rozycki's Imagination e-mail address 2017-11-10 12:16:15 -08:00
COPYING
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS MAINTAINERS: Update drm/i915 bug filing URL 2020-02-28 16:36:12 +01:00
Makefile Linux 4.14.277 2022-04-27 13:15:32 +02:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

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

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.