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Florian Westphal 56b14ecec9 netfilter: conntrack: re-fetch conntrack after insertion 
In case the conntrack is clashing, insertion can free skb->_nfct and
set skb->_nfct to the already-confirmed entry.

This wasn't found before because the conntrack entry and the extension
space used to free'd after an rcu grace period, plus the race needs
events enabled to trigger.

Reported-by: <syzbot+793a590957d9c1b96620@syzkaller.appspotmail.com>
Fixes: 71d8c47fc6 ("netfilter: conntrack: introduce clash resolution on insertion race")
Fixes: 2ad9d7747c ("netfilter: conntrack: free extension area immediately")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2022-05-27 11:16:34 +02:00
arch Networking changes for 5.19. 2022-05-25 12:22:58 -07:00
block Page cache changes for 5.19 2022-05-24 19:55:07 -07:00
certs certs: Explain the rationale to call panic() 2022-05-23 18:47:49 +03:00
crypto certs: Factor out the blacklist hash creation 2022-05-23 18:47:49 +03:00
Documentation dt-bindings: net: adin: Fix adi,phy-output-clock description syntax 2022-05-25 22:03:45 -07:00
drivers net: dsa: mv88e6xxx: Fix refcount leak in mv88e6xxx_mdios_register 2022-05-27 08:02:33 +01:00
fs Networking changes for 5.19. 2022-05-25 12:22:58 -07:00
include netfilter: conntrack: re-fetch conntrack after insertion 2022-05-27 11:16:34 +02:00
init slab changes for 5.19 2022-05-25 10:24:04 -07:00
ipc fs: allocate inode by using alloc_inode_sb() 2022-03-22 15:57:03 -07:00
kernel Networking changes for 5.19. 2022-05-25 12:22:58 -07:00
lib Networking changes for 5.19. 2022-05-25 12:22:58 -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 linux-kselftest-kunit-5.19-rc1 2022-05-25 11:32:53 -07:00
net netfilter: nfnetlink: fix warn in nfnetlink_unbind 2022-05-27 11:16:33 +02:00
samples Networking changes for 5.19. 2022-05-25 12:22:58 -07:00
scripts Networking changes for 5.19. 2022-05-25 12:22:58 -07:00
security linux-kselftest-kunit-5.19-rc1 2022-05-25 11:32:53 -07:00
sound xen: branch for v5.19-rc1 2022-05-23 20:49:45 -07:00
tools selftests/net: enable lo.accept_local in psock_snd test 2022-05-25 21:58:35 -07:00
usr Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
virt KVM: Free new dirty bitmap if creating a new memslot fails 2022-05-20 13:02:05 -04:00
.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 Scheduler changes in this cycle were: 2022-05-24 11:11:13 -07:00
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 Networking changes for 5.19. 2022-05-25 12:22:58 -07:00
Makefile kernel-hardening updates for v5.19-rc1 2022-05-24 12:27:09 -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.