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Sreedevi Joshi b29a5a7dd1 idpf: Fix RSS LUT NULL pointer crash on early ethtool operations [ Upstream commit `83f38f210b` ] The RSS LUT is not initialized until the interface comes up, causing the following NULL pointer crash when ethtool operations like rxhash on/off are performed before the interface is brought up for the first time. Move RSS LUT initialization from ndo_open to vport creation to ensure LUT is always available. This enables RSS configuration via ethtool before bringing the interface up. Simplify LUT management by maintaining all changes in the driver's soft copy and programming zeros to the indirection table when rxhash is disabled. Defer HW programming until the interface comes up if it is down during rxhash and LUT configuration changes. Steps to reproduce: Load idpf driver; interfaces will be created modprobe idpf Before bringing the interfaces up, turn rxhash off ethtool -K eth2 rxhash off [89408.371875] BUG: kernel NULL pointer dereference, address: 0000000000000000 [89408.371908] #PF: supervisor read access in kernel mode [89408.371924] #PF: error_code(0x0000) - not-present page [89408.371940] PGD 0 P4D 0 [89408.371953] Oops: Oops: 0000 [#1] SMP NOPTI <snip> [89408.372052] RIP: 0010:memcpy_orig+0x16/0x130 [89408.372310] Call Trace: [89408.372317] <TASK> [89408.372326] ? idpf_set_features+0xfc/0x180 [idpf] [89408.372363] __netdev_update_features+0x295/0xde0 [89408.372384] ethnl_set_features+0x15e/0x460 [89408.372406] genl_family_rcv_msg_doit+0x11f/0x180 [89408.372429] genl_rcv_msg+0x1ad/0x2b0 [89408.372446] ? __pfx_ethnl_set_features+0x10/0x10 [89408.372465] ? __pfx_genl_rcv_msg+0x10/0x10 [89408.372482] netlink_rcv_skb+0x58/0x100 [89408.372502] genl_rcv+0x2c/0x50 [89408.372516] netlink_unicast+0x289/0x3e0 [89408.372533] netlink_sendmsg+0x215/0x440 [89408.372551] __sys_sendto+0x234/0x240 [89408.372571] __x64_sys_sendto+0x28/0x30 [89408.372585] x64_sys_call+0x1909/0x1da0 [89408.372604] do_syscall_64+0x7a/0xfa0 [89408.373140] ? clear_bhb_loop+0x60/0xb0 [89408.373647] entry_SYSCALL_64_after_hwframe+0x76/0x7e [89408.378887] </TASK> <snip> Fixes: `a251eee621` ("idpf: add SRIOV support and other ndo_ops") Signed-off-by: Sreedevi Joshi <sreedevi.joshi@intel.com> Reviewed-by: Sridhar Samudrala <sridhar.samudrala@intel.com> Reviewed-by: Emil Tantilov <emil.s.tantilov@intel.com> Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com> Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de> Reviewed-by: Simon Horman <horms@kernel.org> Tested-by: Samuel Salin <Samuel.salin@intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2026-01-17 16:35:27 +01:00
arch	riscv: pgtable: Cleanup useless VA_USER_XXX definitions	2026-01-17 16:35:25 +01:00
block	block: fix NULL pointer dereference in blk_zone_reset_all_bio_endio()	2026-01-08 10:17:21 +01:00
certs	sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3	2024-09-20 19:52:48 +03:00
crypto	crypto: seqiv - Do not use req->iv after crypto_aead_encrypt	2026-01-08 10:16:43 +01:00
Documentation	dt-bindings: PCI: qcom,pcie-sm8550: Add missing required power-domains and resets	2026-01-02 12:57:27 +01:00
drivers	idpf: Fix RSS LUT NULL pointer crash on early ethtool operations	2026-01-17 16:35:27 +01:00
fs	btrfs: fix NULL pointer dereference in do_abort_log_replay()	2026-01-17 16:35:25 +01:00
include	net: airoha: Fix npu rx DMA definitions	2026-01-17 16:35:25 +01:00
init	printk changes for 6.18	2025-10-04 11:13:11 -07:00
io_uring	io_uring/io-wq: fix incorrect io_wq_for_each_worker() termination logic	2026-01-17 16:35:14 +01:00
ipc	namespace-6.18-rc1	2025-09-29 11:20:29 -07:00
kernel	perf: Ensure swevent hrtimer is properly destroyed	2026-01-17 16:35:24 +01:00
lib	lib/crypto: aes: Fix missing MMU protection for AES S-box	2026-01-17 16:35:12 +01:00
LICENSES	LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2	2025-07-24 11:15:39 +02:00
mm	mm/damon/tests/core-kunit: handle alloc failures on damon_test_split_regions_of()	2026-01-08 10:17:21 +01:00
net	net: fix memory leak in skb_segment_list for GRO packets	2026-01-17 16:35:26 +01:00
rust	rust: maple_tree: rcu_read_lock() in destructor to silence lockdep	2026-01-08 10:17:11 +01:00
samples	samples/ftrace: Adjust LoongArch register restore order in direct calls	2026-01-08 10:17:11 +01:00
scripts	mcb: Add missing modpost build support	2026-01-08 10:16:47 +01:00
security	kernel/kexec: change the prototype of kimage_map_segment()	2026-01-08 10:17:10 +01:00
sound	ALSA: hda/realtek: Add support for ASUS UM3406GA	2026-01-17 16:35:17 +01:00
tools	selftests/mm: fix thread state check in uffd-unit-tests	2026-01-08 10:17:11 +01:00
usr	gen_init_cpio: Ignore fsync() returning EINVAL on pipes	2025-10-07 09:53:05 -07:00
virt	KVM: Fix last_boosted_vcpu index assignment bug	2026-01-02 12:57:21 +01:00
.clang-format	memblock: drop for_each_free_mem_pfn_range_in_zone_from()	2025-09-14 08:49:03 +03:00
.clippy.toml	rust: clean Rust 1.88.0's warning about `clippy::disallowed_macros` configuration	2025-05-07 00:11:47 +02:00
.cocciconfig	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	MAINTAINERS: remove Alyssa Rosenzweig	2025-09-18 21:17:31 +02:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	.gitignore: ignore compile_commands.json globally	2025-08-12 15:53:55 -07:00
.mailmap	8 hotfixes. 4 are cc:stable, 7 are against mm/.	2025-11-26 12:38:05 -08:00
.pylintrc	tools: docs: parse-headers.py: move it from sphinx dir	2025-08-29 15:54:42 -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	MAINTAINERS: mark ISDN subsystem as orphan	2025-10-27 17:49:45 -07:00
Kbuild	sched: Make migrate_{en,dis}able() inline	2025-09-25 09:57:16 +02:00
Kconfig	io_uring: Rename KConfig to Kconfig	2025-02-19 14:53:27 -07:00
MAINTAINERS	soc: fixes for 6.18, part 4	2025-11-28 09:57:31 -08:00
Makefile	Linux 6.18.5	2026-01-11 15:26:20 +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.