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Thomas Zimmermann 27a7e8b6c5 drm/sysfb: Do not deref unexisting CRTC state in atomic_disable
Do not access CRTC state in drm_sysfb_plane_helper_atomic_disable().
Use format from sysfb device for clearing scanout buffer. This is
the behavior from before commit 061963cd9e ("drm/sysfb: Blit to
CRTC destination format").

When being disabled, the plane has no associated CRTC. Trying to deref
the format pointer results in a segmentation fault. An example stack
track is shown below.

[   58.948915] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000023: 0000 [#1] SMP KASAN PTI
[   58.959971] KASAN: null-ptr-deref in range [0x0000000000000118-0x000000000000011f]
[...]
[   58.979308] RIP: 0010:drm_sysfb_plane_helper_atomic_disable+0x1af/0x520
[...]
[   59.084227] Call Trace:
[   59.086682]  <TASK>
[   59.088793]  ? __pfx_drm_sysfb_plane_helper_atomic_disable+0x10/0x10
[   59.095155]  ? crtc_disable+0xf2/0x5a0
[   59.098920]  drm_atomic_helper_commit_planes+0x848/0x1030
[   59.104336]  drm_atomic_helper_commit_tail+0x41/0xb0
[   59.109316]  commit_tail+0x204/0x330
[   59.112903]  drm_atomic_helper_commit+0x242/0x2e0
[   59.117618]  ? __pfx_drm_atomic_helper_commit+0x10/0x10
[   59.122851]  drm_atomic_commit+0x1e1/0x290
[   59.126957]  ? drm_atomic_add_affected_connectors+0x266/0x330
[   59.132714]  ? __pfx_drm_atomic_commit+0x10/0x10
[   59.137343]  ? __pfx___drm_printfn_info+0x10/0x10
[   59.142058]  ? drm_atomic_set_crtc_for_connector+0x436/0x630
[   59.147729]  atomic_remove_fb+0x631/0x920
[   59.151751]  ? save_trace+0xcf/0x180
[   59.155343]  ? __pfx_atomic_remove_fb+0x10/0x10
[   59.159890]  ? __pfx___drm_dev_dbg+0x10/0x10
[   59.164173]  drm_framebuffer_remove+0x19a/0x710

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 061963cd9e ("drm/sysfb: Blit to CRTC destination format")
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14874
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Javier Martinez Canillas <javierm@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://lore.kernel.org/r/20250826145044.954396-1-tzimmermann@suse.de
2025-08-27 14:09:58 +02:00
arch - Remove a transitional asm/cpuid.h header which was added only as 2025-08-17 06:53:15 -07:00
block block: restore default wbt enablement 2025-08-13 05:33:48 -06:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto Significant patch series in this pull request: 2025-08-03 16:23:09 -07:00
Documentation dt-bindings: display: rockchip: Add rk3576 to RK3588 DW DSI2 controller schema 2025-08-22 23:13:10 +02:00
drivers drm/sysfb: Do not deref unexisting CRTC state in atomic_disable 2025-08-27 14:09:58 +02:00
fs xfs: Fixes for 6.17-rc2 2025-08-15 12:50:12 -07:00
include drm/vesadrm: Support DRM_FORMAT_C8 2025-08-26 09:54:20 +02:00
init Significant patch series in this pull request: 2025-08-03 16:23:09 -07:00
io_uring io_uring/io-wq: add check free worker before create new worker 2025-08-13 06:31:10 -06:00
ipc vfs-6.17-rc1.mmap_prepare 2025-07-28 13:43:25 -07:00
kernel - Make sure sanity checks down in the mutex lock path happen on the correct 2025-08-17 05:57:47 -07:00
lib Including fixes from Netfilter and IPsec. 2025-08-14 07:14:30 -07:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm mm/mremap: avoid expensive folio lookup on mremap folio pte batch 2025-08-11 23:00:59 -07:00
net Including fixes from Netfilter and IPsec. 2025-08-14 07:14:30 -07:00
rust Merge drm/drm-next into drm-misc-next 2025-08-20 09:33:06 +02:00
samples Significant patch series in this pull request: 2025-08-03 16:23:09 -07:00
scripts Kbuild updates for v6.17 2025-08-06 07:32:52 +03:00
security + Features 2025-08-04 08:17:28 -07:00
sound ALSA: hda/tas2781: Normalize the volume kcontrol name 2025-08-14 11:17:12 +02:00
tools Including fixes from Netfilter and IPsec. 2025-08-14 07:14:30 -07:00
usr usr/include: openrisc: don't HDRTEST bpf_perf_event.h 2025-05-12 15:03:17 +09:00
virt Merge tag 'kvm-x86-no_assignment-6.17' of https://github.com/kvm-x86/linux into HEAD 2025-07-29 08:36:42 -04:00
.clang-format Linux 6.15-rc5 2025-05-06 16:39:25 +10:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: Retire Ralf Baechle 2024-11-12 15:48:59 +01:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore gitignore: allow .pylintrc to be tracked 2025-07-02 17:10:04 -06:00
.mailmap Merge drm/drm-next into drm-misc-n 2025-08-11 14:37:45 +02:00
.pylintrc docs: add a .pylintrc file with sys path for docs scripts 2025-04-09 12:10:33 -06:00
.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 Kbuild updates for v6.17 2025-08-06 07:32:52 +03:00
Kbuild drm: ensure drm headers are self-contained and pass kernel-doc 2025-02-12 10:44:43 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS drm-misc-next for v6.18: 2025-08-19 07:02:30 +10:00
Makefile Linux 6.17-rc2 2025-08-17 15:22:10 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

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 reStructuredText 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.