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Parav Pandit 1b8d886901 net/mlx5: Fix vhca_id access call trace use before alloc 
[ Upstream commit a8f930b7be ]

HCA CAP structure is allocated in mlx5_hca_caps_alloc().
mlx5_mdev_init()
  mlx5_hca_caps_alloc()

And HCA CAP is read from the device in mlx5_init_one().

The vhca_id's debugfs file is published even before above two
operations are done.
Due to this when user reads the vhca id before the initialization,
following call trace is observed.

Fix this by deferring debugfs publication until the HCA CAP is
allocated and read from the device.

BUG: kernel NULL pointer dereference, address: 0000000000000004
PGD 0 P4D 0
Oops: Oops: 0000 [#1] SMP PTI
CPU: 23 UID: 0 PID: 6605 Comm: cat Kdump: loaded Not tainted 6.18.0-rc7-sf+ #110 PREEMPT(full)
Hardware name: Supermicro SYS-6028U-TR4+/X10DRU-i+, BIOS 2.0b 08/09/2016
RIP: 0010:vhca_id_show+0x17/0x30 [mlx5_core]
Code: cb 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 48 8b 47 70 48 c7 c6 45 f0 12 c1 48 8b 80 70 03 00 00 <8b> 50 04 0f ca 0f b7 d2 e8 8c 82 47 cb 31 c0 c3 cc cc cc cc 0f 1f
RSP: 0018:ffffd37f4f337d40 EFLAGS: 00010203
RAX: 0000000000000000 RBX: ffff8f18445c9b40 RCX: 0000000000000001
RDX: ffff8f1109825180 RSI: ffffffffc112f045 RDI: ffff8f18445c9b40
RBP: 0000000000000000 R08: 0000645eac0d2928 R09: 0000000000000006
R10: ffffd37f4f337d48 R11: 0000000000000000 R12: ffffd37f4f337dd8
R13: ffffd37f4f337db0 R14: ffff8f18445c9b68 R15: 0000000000000001
FS:  00007f3eea099580(0000) GS:ffff8f2090f1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000004 CR3: 00000008b64e4006 CR4: 00000000003726f0
Call Trace:
 <TASK>
 seq_read_iter+0x11f/0x4f0
 ? _raw_spin_unlock+0x15/0x30
 ? do_anonymous_page+0x104/0x810
 seq_read+0xf6/0x120
 ? srso_alias_untrain_ret+0x1/0x10
 full_proxy_read+0x5c/0x90
 vfs_read+0xad/0x320
 ? handle_mm_fault+0x1ab/0x290
 ksys_read+0x52/0xd0
 do_syscall_64+0x61/0x11e0
 entry_SYSCALL_64_after_hwframe+0x76/0x7e

Fixes: dd3dd7263c ("net/mlx5: Expose vhca_id to debugfs")
Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Shay Drori <shayd@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/1769503961-124173-4-git-send-email-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-02-06 16:55:43 +01:00
arch arm64: dts: rockchip: remove redundant max-link-speed from nanopi-r4s 2026-01-30 10:28:48 +01:00
block block: fix NULL pointer dereference in blk_zone_reset_all_bio_endio() 2026-01-08 10:15:06 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec 2026-01-30 10:28:39 +01:00
Documentation fou: Don't allow 0 for FOU_ATTR_IPPROTO. 2026-01-30 10:28:39 +01:00
drivers net/mlx5: Fix vhca_id access call trace use before alloc 2026-02-06 16:55:43 +01:00
fs btrfs: fix racy bitfield write in btrfs_clear_space_info_full() 2026-01-30 10:28:48 +01:00
include nfc: nci: Fix race between rfkill and nci_unregister_device(). 2026-02-06 16:55:42 +01:00
init init: handle bootloader identifier in kernel parameters 2025-10-19 16:33:50 +02:00
io_uring io_uring/io-wq: check IO_WQ_BIT_EXIT inside work run loop 2026-01-30 10:28:41 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel sched_ext: Fix possible deadlock in the deferred_irq_workfn() 2026-01-30 10:28:48 +01:00
lib lib/buildid: use __kernel_read() for sleepable context 2026-01-23 11:18:43 +01:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm migrate: correct lock ordering for hugetlb file folios 2026-01-30 10:28:47 +01:00
net net: bridge: fix static key check 2026-02-06 16:55:42 +01:00
rust rust: kbuild: workaround rustdoc doctests modifier bug 2025-11-24 10:36:07 +01:00
samples samples/ftrace: Adjust LoongArch register restore order in direct calls 2026-01-08 10:14:50 +01:00
scripts kconfig: fix static linking of nconf 2026-01-30 10:28:41 +01:00
security keys/trusted_keys: fix handle passed to tpm_buf_append_name during unseal 2026-01-30 10:28:44 +01:00
sound ALSA: usb-audio: Fix use-after-free in snd_usb_mixer_free() 2026-01-30 10:28:45 +01:00
tools selftests/bpf: Check for timeout in perf_link test 2026-01-30 10:28:47 +01:00
usr kbuild: uapi: Strip comments before size type check 2025-11-13 15:34:35 -05:00
virt KVM: Disallow toggling KVM_MEM_GUEST_MEMFD on an existing memslot 2026-01-08 10:14:21 +01:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: give Clippy the minimum supported Rust version 2025-08-01 09:48:44 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -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 self from DSA entry 2024-11-03 12:52:38 -08:00
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 staging: rtl8712: Remove driver using deprecated API wext 2025-12-07 06:25:02 +09:00
Makefile Linux 6.12.68 2026-01-30 10:28:49 +01:00
README README: Fix spelling 2024-03-18 03:36:32 -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 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.