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Imre Deak 47fadb03bd drm/dp_mst: Fix NULL dereference during payload addition 
Fix the NULL dereference leading to the following stack trace:

[  129.687181] i915 0000:00:02.0: [drm:drm_dp_add_payload_part1 [drm_display_helper]] VCPI 1 for port 000000005be4423e not in topology, not creating a payload to remote
[  129.687257] BUG: kernel NULL pointer dereference, address: 0000000000000560
[  129.694276] #PF: supervisor read access in kernel mode
[  129.699459] #PF: error_code(0x0000) - not-present page
[  129.704612] PGD 0 P4D 0
[  129.707178] Oops: 0000 [#1] PREEMPT SMP NOPTI
[  129.711556] CPU: 2 PID: 1623 Comm: Xorg Tainted: G     U             6.6.0-rc1-imre+ #985
[  129.719744] Hardware name: Intel Corporation Alder Lake Client Platform/AlderLake-P DDR5 RVP, BIOS RPLPFWI1.R00.4035.A00.2301200723 01/20/2023
[  129.732509] RIP: 0010:drm_dp_mst_topology_put_port+0x19/0x170 [drm_display_helper]
[  129.740111] Code: 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 89 fb 48 83 ec 08 <48> 8b 87 60 05 00 00 44 8b 0f 48 8b 70 58 41 83 e9 01 48 85 f6 74
[  129.758842] RSP: 0018:ffffc90001daf900 EFLAGS: 00010286
[  129.764104] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000
[  129.771246] RDX: 0000000000000000 RSI: ffffffff9e73d613 RDI: 0000000000000000
[  129.778394] RBP: ffffc90001daf930 R08: 0000000000000000 R09: 0000000000000020
[  129.785533] R10: 0000000000ffff10 R11: 000000000000000f R12: ffff888116c65e40
[  129.792680] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[  129.799822] FS:  00007f39f74b1a80(0000) GS:ffff88840f680000(0000) knlGS:0000000000000000
[  129.807913] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  129.813670] CR2: 0000000000000560 CR3: 0000000138b88000 CR4: 0000000000750ee0
[  129.820815] PKRU: 55555554
[  129.823551] Call Trace:
[  129.826022]  <TASK>
[  129.828154]  ? show_regs+0x65/0x70
[  129.831599]  ? __die+0x24/0x70
[  129.834683]  ? page_fault_oops+0x160/0x480
[  129.838824]  ? dev_printk_emit+0x83/0xb0
[  129.842797]  ? do_user_addr_fault+0x2e2/0x680
[  129.847175]  ? exc_page_fault+0x78/0x180
[  129.851143]  ? asm_exc_page_fault+0x27/0x30
[  129.855353]  ? drm_dp_mst_topology_put_port+0x19/0x170 [drm_display_helper]
[  129.862354]  drm_dp_add_payload_part1+0x85/0x100 [drm_display_helper]
[  129.868832]  intel_mst_pre_enable_dp+0x1ef/0x240 [i915]
[  129.874170]  intel_encoders_pre_enable+0x83/0xa0 [i915]
[  129.879524]  hsw_crtc_enable+0xbe/0x750 [i915]
[  129.884095]  intel_enable_crtc+0x68/0xa0 [i915]
[  129.888752]  skl_commit_modeset_enables+0x2c4/0x5d0 [i915]
[  129.894365]  intel_atomic_commit_tail+0x765/0x1070 [i915]
[  129.899885]  intel_atomic_commit+0x3ba/0x400 [i915]
[  129.904892]  drm_atomic_commit+0x96/0xd0 [drm]
[  129.909405]  ? __pfx___drm_printfn_info+0x10/0x10 [drm]
[  129.914698]  drm_atomic_helper_set_config+0x7e/0xc0 [drm_kms_helper]
[  129.921102]  drm_mode_setcrtc+0x5af/0x8d0 [drm]
[  129.925695]  ? __pfx_drm_mode_setcrtc+0x10/0x10 [drm]
[  129.930810]  drm_ioctl_kernel+0xc4/0x170 [drm]
[  129.935317]  drm_ioctl+0x2a4/0x520 [drm]
[  129.939305]  ? __pfx_drm_mode_setcrtc+0x10/0x10 [drm]
[  129.944415]  ? __fget_light+0xa5/0x110
[  129.948212]  __x64_sys_ioctl+0x98/0xd0
[  129.951985]  do_syscall_64+0x37/0x90
[  129.955581]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8

Fixes: 5aa1dfcdf0 ("drm/mst: Refactor the flow for payload allocation/removement")
Cc: Wayne Lin <Wayne.Lin@amd.com>
Cc: Lyude Paul <lyude@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230913223218.540365-1-imre.deak@intel.com
2023-09-18 16:37:55 +03:00
arch sh: mach-sh7763rdp: Assign FB_MODE_IS_UNKNOWN to struct fb_videomode.flag 2023-07-24 16:50:38 +02:00
block SCSI fixes on 20230714 2023-07-14 19:57:29 -07:00
certs KEYS: Add missing function documentation 2023-04-24 16:15:52 +03:00
crypto crypto: algif_hash - Fix race between MORE and non-MORE sends 2023-07-08 22:48:42 +10:00
Documentation drm/doc/rfc: Mark GPU VA as complete. 2023-09-07 17:29:54 -04:00
drivers drm/dp_mst: Fix NULL dereference during payload addition 2023-09-18 16:37:55 +03:00
fs Five smb3 client fixes 2023-07-16 12:49:05 -07:00
include drm/debugfs: Fix drm_debugfs_remove_files() stub 2023-09-14 07:51:45 +02:00
init Kbuild updates for v6.5 2023-07-01 09:24:31 -07:00
io_uring io_uring-6.5-2023-07-14 2023-07-14 19:46:54 -07:00
ipc Merge branch 'work.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2023-02-24 19:20:07 -08:00
kernel - Remove a cgroup from under a polling process properly 2023-07-16 13:22:08 -07:00
lib iov_iter: Mark copy_iovec_from_user() noclone 2023-07-10 09:52:28 +02:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm: lock newly mapped VMA with corrected ordering 2023-07-08 16:44:11 -07:00
net A fix to prevent a potential buffer overrun in the messenger, marked 2023-07-14 09:05:15 -07:00
rust rust: error: impl Debug for Error with errname() integration 2023-06-13 01:24:42 +02:00
samples vfio-dev/mdpy-fb: Use fbdev I/O helpers 2023-08-04 15:54:39 +02:00
scripts kallsyms: strip LTO-only suffixes from promoted global functions 2023-07-12 15:39:34 -07:00
security + Bug Fixes 2023-07-07 09:55:31 -07:00
sound sound fixes for 6.5-rc1 2023-07-07 15:40:17 -07:00
tools - Mark copy_iovec_from_user() __noclone in order to prevent gcc from 2023-07-16 13:34:29 -07:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt ARM64: 2023-07-03 15:32:22 -07:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Revert ".gitignore: ignore *.cover and *.mbx" 2023-07-04 15:05:12 -07:00
.mailmap spi: Fixes for v6.5 2023-07-15 08:51:02 -07:00
.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 - Address -Wmissing-prototype warnings 2023-06-26 16:43:54 -07:00
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 MAINTAINERS: add drm_bridge_connector.[ch] files under bridge chips 2023-09-15 18:42:13 +03:00
Makefile Linux 6.5-rc2 2023-07-16 15:10:37 -07:00
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.