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Ming Lei 2d87d455ea blk-mq: don't add non-pt request with ->end_io to batch 
dm-rq implements ->end_io callback for request issued to underlying queue,
and it isn't passthrough request.

Commit ab3e1d3bba ("block: allow end_io based requests in the completion
batch handling") doesn't clear rq->bio and rq->__data_len for request
with ->end_io in blk_mq_end_request_batch(), and this way is actually
dangerous, but so far it is only for nvme passthrough request.

dm-rq needs to clean up remained bios in case of partial completion,
and req->bio is required, then use-after-free is triggered, so the
underlying clone request can't be completed in blk_mq_end_request_batch.

Fix panic by not adding such request into batch list, and the issue
can be triggered simply by exposing nvme pci to dm-mpath simply.

Fixes: ab3e1d3bba ("block: allow end_io based requests in the completion batch handling")
Cc: dm-devel@redhat.com
Cc: Mike Snitzer <snitzer@kernel.org>
Reported-by: Changhui Zhong <czhong@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20221027085709.513175-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-10-27 07:15:44 -06:00
arch powerpc updates for 6.1 2022-10-09 14:05:15 -07:00
block block: fix memory leak for elevator on add_disk failure 2022-10-22 15:14:38 -06:00
certs certs: make system keyring depend on built-in x509 parser 2022-09-24 04:31:18 +09:00
crypto crypto: blake2b: effectively disable frame size warning 2022-08-10 17:59:11 -07:00
Documentation Documentation: document ublk user recovery feature 2022-10-18 05:12:26 -07:00
drivers rbd: fix possible memory leak in rbd_sysfs_init() 2022-10-27 07:15:30 -06:00
fs ucounts: Split rlimit and ucount values and max values 2022-10-09 16:24:05 -07:00
include blk-mq: don't add non-pt request with ->end_io to batch 2022-10-27 07:15:44 -06:00
init powerpc updates for 6.1 2022-10-09 14:05:15 -07:00
io_uring for-6.1/passthrough-2022-10-04 2022-10-07 09:35:50 -07:00
ipc ipc: mqueue: fix possible memory leak in init_mqueue_fs() 2022-10-09 16:10:22 -07:00
kernel blktrace: remove unnessary stop block trace in 'blk_trace_shutdown' 2022-10-20 06:02:52 -07:00
lib Driver core changes for 6.1-rc1 2022-10-07 17:04:10 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm The first batch of KVM patches, mostly covering x86, which I 2022-10-09 09:39:55 -07:00
net Driver core changes for 6.1-rc1 2022-10-07 17:04:10 -07:00
rust Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
samples ARM: driver updates for 6.1 2022-10-06 11:04:57 -07:00
scripts Networking changes for 6.1. 2022-10-04 13:38:03 -07:00
security powerpc updates for 6.1 2022-10-09 14:05:15 -07:00
sound sound updates for 6.1-rc1 2022-10-05 12:02:07 -07:00
tools powerpc updates for 6.1 2022-10-09 14:05:15 -07:00
usr Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
virt KVM: remove KVM_REQ_UNHALT 2022-09-26 12:37:21 -04:00
.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: add Rust support 2022-09-28 09:02:20 +02:00
.mailmap The first batch of KVM patches, mostly covering x86, which I 2022-10-09 09:39:55 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +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 nvme: add Guenther as nvme-hwmon maintainer 2022-10-19 12:42:43 +02:00
Makefile hardening updates for v6.1-rc1 2022-10-03 17:24:22 -07:00
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.