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1d160dfb3f
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Shang XiaoJing 1d160dfb3f drm: Fix potential null-ptr-deref in drm_vblank_destroy_worker() 
[ Upstream commit 4979524f5a ]

drm_vblank_init() call drmm_add_action_or_reset() with
drm_vblank_init_release() as action. If __drmm_add_action() failed, will
directly call drm_vblank_init_release() with the vblank whose worker is
NULL. As the resule, a null-ptr-deref will happen in
kthread_destroy_worker(). Add the NULL check before calling
drm_vblank_destroy_worker().

BUG: null-ptr-deref
KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
CPU: 5 PID: 961 Comm: modprobe Not tainted 6.0.0-11331-gd465bff130bf-dirty
RIP: 0010:kthread_destroy_worker+0x25/0xb0
  Call Trace:
    <TASK>
    drm_vblank_init_release+0x124/0x220 [drm]
    ? drm_crtc_vblank_restore+0x8b0/0x8b0 [drm]
    __drmm_add_action_or_reset+0x41/0x50 [drm]
    drm_vblank_init+0x282/0x310 [drm]
    vkms_init+0x35f/0x1000 [vkms]
    ? 0xffffffffc4508000
    ? lock_is_held_type+0xd7/0x130
    ? __kmem_cache_alloc_node+0x1c2/0x2b0
    ? lock_is_held_type+0xd7/0x130
    ? 0xffffffffc4508000
    do_one_initcall+0xd0/0x4f0
    ...
    do_syscall_64+0x35/0x80
    entry_SYSCALL_64_after_hwframe+0x46/0xb0

Fixes: 5e6c2b4f91 ("drm/vblank: Add vblank works")
Signed-off-by: Shang XiaoJing <shangxiaojing@huawei.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221101070716.9189-3-shangxiaojing@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-11-25 17:45:44 +01:00
arch arm64: Fix bit-shifting UB in the MIDR_CPU_MODEL() macro 2022-11-25 17:45:44 +01:00
block block: sed-opal: kmalloc the cmd/resp buffers 2022-11-25 17:45:43 +01:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:13:17 +02:00
crypto crypto: akcipher - default implementation for setting a private key 2022-10-26 13:25:42 +02:00
Documentation KVM: s390: pv: don't allow userspace to set the clock under PV 2022-11-16 09:57:10 +01:00
drivers drm: Fix potential null-ptr-deref in drm_vblank_destroy_worker() 2022-11-25 17:45:44 +01:00
fs btrfs: remove pointless and double ulist frees in error paths of qgroup tests 2022-11-25 17:45:40 +01:00
include mtd: spi-nor: intel-spi: Disable write protection only if asked 2022-11-25 17:45:41 +01:00
init Kconfig: Add option for asm goto w/ tied outputs to workaround clang-13 bug 2022-06-09 10:21:25 +02:00
ipc ipc: remove memcg accounting for sops objects in do_semtimedop() 2022-11-10 18:14:29 +01:00
kernel bpf: Fix wrong reg type conversion in release_reference() 2022-11-16 09:57:09 +01:00
lib dyndbg: drop EXPORTed dynamic_debug_exec_queries 2022-10-26 13:25:34 +02:00
LICENSES LICENSES/deprecated: add Zlib license text 2020-09-16 14:33:49 +02:00
mm mm/memremap.c: map FS_DAX device memory as decrypted 2022-11-16 09:57:17 +01:00
net sctp: clear out_curr if all frag chunks of current msg are pruned 2022-11-25 17:45:43 +01:00
samples x86: Prepare inline-asm for straight-line-speculation 2022-07-25 11:26:29 +02:00
scripts cert host tools: Stop complaining about deprecated OpenSSL functions 2022-11-16 09:57:17 +01:00
security capabilities: fix potential memleak on error path from vfs_getxattr_alloc() 2022-11-10 18:14:26 +01:00
sound ASoC: soc-utils: Remove __exit for snd_soc_util_exit() 2022-11-25 17:45:43 +01:00
tools selftests/intel_pstate: fix build for ARCH=x86_64 2022-11-25 17:45:39 +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: Add support for arch compat vm ioctls 2022-10-30 09:41:15 +01:00
.clang-format RDMA 5.10 pull request 2020-10-17 11:18:18 -07:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.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: add Amir as xfs maintainer for 5.10.y 2022-07-02 16:39:22 +02:00
Makefile Linux 5.10.155 2022-11-16 09:57:20 +01:00
README

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.