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Duoming Zhou e2201ef32f ax25: Fix NULL pointer dereference in ax25_kill_by_device [ Upstream commit `71171ac8eb` ] When two ax25 devices attempted to establish connection, the requester use ax25_create(), ax25_bind() and ax25_connect() to initiate connection. The receiver use ax25_rcv() to accept connection and use ax25_create_cb() in ax25_rcv() to create ax25_cb, but the ax25_cb->sk is NULL. When the receiver is detaching, a NULL pointer dereference bug caused by sock_hold(sk) in ax25_kill_by_device() will happen. The corresponding fail log is shown below: =============================================================== BUG: KASAN: null-ptr-deref in ax25_device_event+0xfd/0x290 Call Trace: ... ax25_device_event+0xfd/0x290 raw_notifier_call_chain+0x5e/0x70 dev_close_many+0x174/0x220 unregister_netdevice_many+0x1f7/0xa60 unregister_netdevice_queue+0x12f/0x170 unregister_netdev+0x13/0x20 mkiss_close+0xcd/0x140 tty_ldisc_release+0xc0/0x220 tty_release_struct+0x17/0xa0 tty_release+0x62d/0x670 ... This patch add condition check in ax25_kill_by_device(). If s->sk is NULL, it will goto if branch to kill device. Fixes: `4e0f718daf` ("ax25: improve the incomplete fix to avoid UAF and NPD bugs") Reported-by: Thomas Osterried <thomas@osterried.de> Signed-off-by: Duoming Zhou <duoming@zju.edu.cn> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-03-16 14:15:58 +01:00
arch	ARM: dts: aspeed: Fix AST2600 quad spi group	2022-03-16 14:15:57 +01:00
block	block/wbt: fix negative inflight counter when remove scsi device	2022-02-23 12:01:04 +01:00
certs	certs: Trigger creation of RSA module signing key if it's not an RSA key	2021-09-15 09:50:29 +02:00
crypto	crypto: api - Move cryptomgr soft dependency into algapi	2022-02-11 09:09:03 +01:00
Documentation	arm64: cpufeature: add HWCAP for FEAT_RPRES	2022-03-11 12:11:51 +01:00
drivers	net: ethernet: lpc_eth: Handle error for clk_enable	2022-03-16 14:15:58 +01:00
fs	btrfs: add missing run of delayed items after unlink during log replay	2022-03-08 19:09:38 +01:00
include	xen/gnttab: fix gnttab_end_foreign_access() without page specified	2022-03-11 12:11:54 +01:00
init	bpf: Add kconfig knob for disabling unpriv bpf by default	2022-01-05 12:40:34 +01:00
ipc	shm: extend forced shm destroy to support objects from several IPC nses	2021-12-01 09:19:10 +01:00
kernel	x86/speculation: Include unprivileged eBPF status in Spectre v2 mitigation reporting	2022-03-11 12:11:49 +01:00
lib	lib/iov_iter: initialize "flags" in new pipe_buffer	2022-02-23 12:01:06 +01:00
LICENSES	LICENSES/deprecated: add Zlib license text	2020-09-16 14:33:49 +02:00
mm	memfd: fix F_SEAL_WRITE after shmem huge page allocated	2022-03-08 19:09:36 +01:00
net	ax25: Fix NULL pointer dereference in ax25_kill_by_device	2022-03-16 14:15:58 +01:00
samples	ftrace/samples: Add missing prototypes direct functions	2022-01-11 15:25:00 +01:00
scripts	kconfig: fix failing to generate auto.conf	2022-02-23 12:01:07 +01:00
security	ima: Do not print policy rule with inactive LSM labels	2022-02-16 12:54:16 +01:00
sound	ASoC: cs4265: Fix the duplicated control name	2022-03-08 19:09:35 +01:00
tools	x86/speculation: Rename RETPOLINE_AMD to RETPOLINE_LFENCE	2022-03-11 12:11:49 +01:00
usr	usr/include/Makefile: add linux/nfc.h to the compile-test coverage	2022-02-01 17:25:48 +01:00
virt	KVM: eventfd: Fix false positive RCU usage warning	2022-02-16 12:54:20 +01:00
.clang-format	RDMA 5.10 pull request	2020-10-17 11:18:18 -07:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.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	kbuild: generate Module.symvers only when vmlinux exists	2021-05-19 10:12:59 +02:00
.mailmap	mailmap: add two more addresses of Uwe Kleine-König	2020-12-06 10:19:07 -08:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Jason Cooper to CREDITS	2020-11-30 10:20:34 +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	MAINTAINERS: adjust GCC PLUGINS after gcc-plugin.sh removal	2021-12-14 11:32:46 +01:00
Makefile	Linux 5.10.105	2022-03-11 12:11:55 +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.