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Shang XiaoJing b141474642 drm: Fix potential null-ptr-deref due to drmm_mode_config_init() 
[ Upstream commit 834c23e4f7 ]

drmm_mode_config_init() will call drm_mode_create_standard_properties()
and won't check the ret value. When drm_mode_create_standard_properties()
failed due to alloc, property will be a NULL pointer and may causes the
null-ptr-deref. Fix the null-ptr-deref by adding the ret value check.

Found null-ptr-deref while testing insert module bochs:
general protection fault, probably for non-canonical address
    0xdffffc000000000c: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]
CPU: 3 PID: 249 Comm: modprobe Not tainted 6.1.0-rc1+ #364
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014
RIP: 0010:drm_object_attach_property+0x73/0x3c0 [drm]
Call Trace:
 <TASK>
 __drm_connector_init+0xb6c/0x1100 [drm]
 bochs_pci_probe.cold.11+0x4cb/0x7fe [bochs]
 pci_device_probe+0x17d/0x340
 really_probe+0x1db/0x5d0
 __driver_probe_device+0x1e7/0x250
 driver_probe_device+0x4a/0x120
 __driver_attach+0xcd/0x2c0
 bus_for_each_dev+0x11a/0x1b0
 bus_add_driver+0x3d7/0x500
 driver_register+0x18e/0x320
 do_one_initcall+0xc4/0x3e0
 do_init_module+0x1b4/0x630
 load_module+0x5dca/0x7230
 __do_sys_finit_module+0x100/0x170
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff65af9f839

Fixes: 6b4959f43a ("drm/atomic: atomic plane properties")
Signed-off-by: Shang XiaoJing <shangxiaojing@huawei.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20221118021651.2460-1-shangxiaojing@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2023-03-10 09:33:08 +01:00
arch LoongArch, bpf: Use 4 instructions for function address in JIT 2023-03-10 09:33:06 +01:00
block block: use proper return value from bio_failfast() 2023-03-10 09:32:47 +01:00
certs certs: Fix build error when PKCS#11 URI contains semicolon 2023-02-09 11:28:11 +01:00
crypto crypto: rsa-pkcs1pad - Use akcipher_request_complete 2023-03-10 09:33:03 +01:00
Documentation attr: use consistent sgid stripping checks 2023-03-03 11:52:25 +01:00
drivers drm: Fix potential null-ptr-deref due to drmm_mode_config_init() 2023-03-10 09:33:08 +01:00
fs erofs: relinquish volume with mutex held 2023-03-10 09:32:46 +01:00
include net/mlx4_en: Introduce flexible array to silence overflow warning 2023-03-10 09:33:08 +01:00
init gcc: disable -Warray-bounds for gcc-11 too 2023-01-14 10:33:43 +01:00
io_uring use less confusing names for iov_iter direction initializers 2023-02-09 11:28:04 +01:00
ipc ipc: fix memory leak in init_mqueue_fs() 2022-12-31 13:32:01 +01:00
kernel bpf: Fix global subprog context argument resolution logic 2023-03-10 09:33:06 +01:00
lib lib/mpi: Fix buffer overrun when SG is too long 2023-03-10 09:32:52 +01:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm/gup: add folio to list when folio_isolate_lru() succeed 2023-02-22 12:59:54 +01:00
net l2tp: Avoid possible recursive deadlock in l2tp_tunnel_register() 2023-03-10 09:33:07 +01:00
rust rust: print: avoid evaluating arguments in pr_* macros in unsafe blocks 2023-02-06 08:06:34 +01:00
samples ftrace: Export ftrace_free_filter() to modules 2023-02-01 08:34:37 +01:00
scripts scripts/tags.sh: fix incompatibility with PCRE2 2023-03-03 11:52:25 +01:00
security randstruct: disable Clang 15 support 2023-02-25 11:25:43 +01:00
sound ASoC: codecs: es8326: Fix DTS properties reading 2023-03-03 11:52:22 +01:00
tools sefltests: netdevsim: wait for devlink instance after netns removal 2023-03-10 09:33:08 +01:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt kvm/vfio: Fix potential deadlock on vfio group_lock 2023-02-01 08:34:36 +01:00
.clang-format inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.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 9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address 2022-12-10 17:10:52 -08:00
.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 MAINTAINERS: Remove Michal Marek from Kbuild maintainers 2022-11-16 14:53:00 +09:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS audit: update the mailing list in MAINTAINERS 2023-02-25 11:25:42 +01:00
Makefile Linux 6.1.15 2023-03-03 11:52:25 +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.