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The source for the Linux kernel used in Windows Subsystem for Linux 2 (WSL2)
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Xin Long 7a939503fc tipc: fix a null-ptr-deref in tipc_topsrv_accept 
[ Upstream commit 82cb4e4612 ]

syzbot found a crash in tipc_topsrv_accept:

  KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
  Workqueue: tipc_rcv tipc_topsrv_accept
  RIP: 0010:kernel_accept+0x22d/0x350 net/socket.c:3487
  Call Trace:
   <TASK>
   tipc_topsrv_accept+0x197/0x280 net/tipc/topsrv.c:460
   process_one_work+0x991/0x1610 kernel/workqueue.c:2289
   worker_thread+0x665/0x1080 kernel/workqueue.c:2436
   kthread+0x2e4/0x3a0 kernel/kthread.c:376
   ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

It was caused by srv->listener that might be set to null by
tipc_topsrv_stop() in net .exit whereas it's still used in
tipc_topsrv_accept() worker.

srv->listener is protected by srv->idr_lock in tipc_topsrv_stop(), so add
a check for srv->listener under srv->idr_lock in tipc_topsrv_accept() to
avoid the null-ptr-deref. To ensure the lsock is not released during the
tipc_topsrv_accept(), move sock_release() after tipc_topsrv_work_stop()
where it's waiting until the tipc_topsrv_accept worker to be done.

Note that sk_callback_lock is used to protect sk->sk_user_data instead of
srv->listener, and it should check srv in tipc_topsrv_listener_data_ready()
instead. This also ensures that no more tipc_topsrv_accept worker will be
started after tipc_conn_close() is called in tipc_topsrv_stop() where it
sets sk->sk_user_data to null.

Fixes: 0ef897be12 ("tipc: separate topology server listener socket from subcsriber sockets")
Reported-by: syzbot+c5ce866a8d30f4be0651@syzkaller.appspotmail.com
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Jon Maloy <jmaloy@redhat.com>
Link: https://lore.kernel.org/r/4eee264380c409c61c6451af1059b7fb271a7e7b.1666120790.git.lucien.xin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2022-11-03 23:59:15 +09:00
Documentation arm64: errata: Remove AES hwcap for COMPAT tasks 2022-10-29 10:12:53 +02:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
arch perf/x86/intel/lbr: Use setup_clear_cpu_cap() instead of clear_cpu_cap() 2022-11-03 23:59:15 +09:00
block blk-wbt: fix that 'rwb->wc' is always set to 1 in wbt_init() 2022-10-26 12:35:54 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto crypto: akcipher - default implementation for setting a private key 2022-10-26 12:35:25 +02:00
drivers mtd: rawnand: intel: Add missing of_node_put() in ebu_nand_probe() 2022-11-03 23:59:15 +09:00
fs kernfs: fix use-after-free in __kernfs_remove 2022-11-03 23:59:13 +09:00
include perf: Fix missing SIGTRAPs 2022-11-03 23:59:15 +09:00
init stack: Declare {randomize_,}kstack_offset to fix Sparse warnings 2022-08-17 14:23:10 +02:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2022-06-09 10:23:10 +02:00
kernel sched/core: Fix comparison in sched_group_cookie_match() 2022-11-03 23:59:15 +09:00
lib lib/Kconfig.debug: Add check for non-constant .{s,u}leb128 support to DWARF5 2022-10-26 12:35:55 +02:00
mm mm,hugetlb: take hugetlb_lock before decrementing h->resv_huge_pages 2022-10-29 10:12:54 +02:00
net tipc: fix a null-ptr-deref in tipc_topsrv_accept 2022-11-03 23:59:15 +09:00
samples samples/landlock: Format with clang-format 2022-06-09 10:23:23 +02:00
scripts kbuild: rpm-pkg: fix breakage when V=1 is used 2022-10-26 12:35:27 +02:00
security selinux: enable use of both GFP_KERNEL and GFP_ATOMIC in convert_context() 2022-10-29 10:12:54 +02:00
sound ALSA: ac97: fix possible memory leak in snd_ac97_dev_register() 2022-11-03 23:59:15 +09:00
tools KVM: selftests: Fix number of pages for memory slot in memslot_modification_stress_test 2022-11-03 23:59:15 +09:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:27:15 +01:00
virt kvm: Add support for arch compat vm ioctls 2022-10-29 10:12:54 +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 .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.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 Input: goodix - add a goodix.h header file 2022-07-12 16:34:51 +02:00
Makefile Linux 5.15.76 2022-10-29 10:12:58 +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.