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Tetsuo Handa 1473bb50cb can: j1939: make j1939_sk_bind() fail if device is no longer registered 
[ Upstream commit 46cea215dc ]

There is a theoretical race window in j1939_sk_netdev_event_unregister()
where two j1939_sk_bind() calls jump in between read_unlock_bh() and
lock_sock().

The assumption jsk->priv == priv can fail if the first j1939_sk_bind()
call once made jsk->priv == NULL due to failed j1939_local_ecu_get() call
and the second j1939_sk_bind() call again made jsk->priv != NULL due to
successful j1939_local_ecu_get() call.

Since the socket lock is held by both j1939_sk_netdev_event_unregister()
and j1939_sk_bind(), checking ndev->reg_state with the socket lock held can
reliably make the second j1939_sk_bind() call fail (and close this race
window).

Fixes: 7fcbe5b2c6 ("can: j1939: implement NETDEV_UNREGISTER notification handler")
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://patch.msgid.link/5732921e-247e-4957-a364-da74bd7031d7@I-love.SAKURA.ne.jp
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-09-02 14:27:26 +02:00
arch KVM: x86: Retry page fault if MMU reload is pending and root has no sp 2026-08-27 14:28:22 +02:00
block partitions: aix: bound the pp_count scan to the ppe array 2026-07-24 15:51:24 +02:00
certs X.509: Fix validation of ASN.1 certificate header 2026-07-24 15:51:59 +02:00
crypto crypto: ccm - Set rfc4309 maxauthsize from child 2026-08-23 14:17:31 +02:00
Documentation PCI: Move Resizable BAR code to rebar.c 2026-07-24 15:51:58 +02:00
drivers RDMA/rxe: Fix OOB in free_rd_atomic_resources() 2026-09-02 14:27:25 +02:00
fs jfs: add check read-only before txBeginAnon() call 2026-09-02 14:27:26 +02:00
include can: use skb hash instead of private variable in headroom 2026-08-27 14:28:22 +02:00
init bootconfig: move xbc_snprint_cmdline() to lib/bootconfig.c 2026-08-23 14:17:24 +02:00
io_uring io_uring/io-wq: fix worker accounting when canceling creation callbacks 2026-09-02 14:27:25 +02:00
ipc ipc/shm: serialize orphan cleanup with shm_nattch updates 2026-06-19 13:33:38 +02:00
kernel perf/core: Fix group leader use-after-free after sibling detach 2026-08-27 14:28:19 +02:00
lib bootconfig: fix NULL-pointer arithmetic in xbc_snprint_cmdline() 2026-08-23 14:17:24 +02:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm/huge_memory: fix huge_zero_pfn race 2026-08-27 14:28:19 +02:00
net can: j1939: make j1939_sk_bind() fail if device is no longer registered 2026-09-02 14:27:26 +02:00
samples tracing/events: Fix to check the simple_tsk_fn creation 2026-07-24 15:51:42 +02:00
scripts kconfig: fix potential NULL pointer dereference in conf_askvalue 2026-07-24 15:51:28 +02:00
security selinux: avoid sk_socket dereference in selinux_sctp_bind_connect() 2026-08-23 14:17:21 +02:00
sound Revert "ALSA: aoa: Use guard() for mutex locks" 2026-08-27 14:28:23 +02:00
tools selftests/ftrace: refactor eprobes test to fix argument checks 2026-08-19 17:14:13 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-06-27 11:05:22 +01:00
virt KVM: Rename mmu_notifier_* to mmu_invalidate_* 2026-08-27 14:28:21 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.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 Remove *.orig pattern from .gitignore 2024-10-17 15:11:10 +02:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
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 staging: rtl8712: Remove driver using deprecated API wext 2025-12-07 06:09:36 +09:00
Makefile Linux 5.15.219 2026-08-28 08:20:31 +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.