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Jan Kara 97bd6c56bd bfq: Make sure bfqg for which we are queueing requests is online 
commit 075a53b78b upstream.

Bios queued into BFQ IO scheduler can be associated with a cgroup that
was already offlined. This may then cause insertion of this bfq_group
into a service tree. But this bfq_group will get freed as soon as last
bio associated with it is completed leading to use after free issues for
service tree users. Fix the problem by making sure we always operate on
online bfq_group. If the bfq_group associated with the bio is not
online, we pick the first online parent.

CC: stable@vger.kernel.org
Fixes: e21b7a0b98 ("block, bfq: add full hierarchical scheduling and cgroups support")
Tested-by: "yukuai (C)" <yukuai3@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220401102752.8599-9-jack@suse.cz
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2022-06-09 10:26:18 +02:00
Documentation dt-bindings: soc: qcom: smd-rpm: Fix missing MSM8936 compatible 2022-06-09 10:26:01 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
arch MIPS: RALINK: Define pci_remap_iospace under CONFIG_PCI_DRIVERS_GENERIC 2022-06-09 10:26:14 +02:00
block bfq: Make sure bfqg for which we are queueing requests is online 2022-06-09 10:26:18 +02:00
certs certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty 2022-01-23 00:08:44 +09:00
crypto crypto: cryptd - Protect per-CPU resource by disabling BH. 2022-06-09 10:26:07 +02:00
drivers iwlwifi: mei: fix potential NULL-ptr deref 2022-06-09 10:26:17 +02:00
fs fs-writeback: writeback_sb_inodes：Recalculate 'wrote' according skipped pages 2022-06-09 10:26:17 +02:00
include NFSv4.1 mark qualified async operations as MOVEABLE tasks 2022-06-09 10:26:15 +02:00
init kthread: Don't allocate kthread_struct for init and umh 2022-06-09 10:25:16 +02:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2022-06-09 10:26:06 +02:00
kernel tracing/timerlat: Notify IRQ new max latency only if stop tracing is set 2022-06-09 10:26:15 +02:00
lib kunit: fix debugfs code to use enum kunit_status, not bool 2022-06-09 10:25:46 +02:00
mm zsmalloc: fix races between asynchronous zspage free and page migration 2022-06-06 08:47:53 +02:00
net wifi: mac80211: fix use-after-free in chanctx code 2022-06-09 10:26:17 +02:00
samples samples: bpf: Don't fail for a missing VMLINUX_BTF when VMLINUX_H is provided 2022-06-09 10:25:48 +02:00
scripts scripts/faddr2line: Fix overlapping text section failures 2022-06-09 10:25:50 +02:00
security efi: Do not import certificates from UEFI Secure Boot for T2 Macs 2022-06-09 10:26:17 +02:00
sound ASoC: atmel-classd: Remove endianness flag on class d component 2022-06-09 10:26:06 +02:00
tools objtool: Fix symbol creation 2022-06-09 10:26:16 +02:00
usr kbuild: remove include/linux/cyclades.h from header file check 2022-01-27 08:51:08 +01:00
virt KVM: Free new dirty bitmap if creating a new memslot fails 2022-05-25 09:59:03 +02:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
…
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap MAINTAINERS: Update Jisheng's email address 2022-03-08 17:30:32 +01:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
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 net: dsa: realtek-smi: move to subdirectory 2022-04-08 13:58:12 +02:00
Makefile Linux 5.17.13 2022-06-06 08:47:57 +02:00
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.