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Sreedevi Joshi ab92fa4dd8 idpf: Fix RSS LUT NULL ptr issue after soft reset 
[ Upstream commit ebecca5b09 ]

During soft reset, the RSS LUT is freed and not restored unless the
interface is up. If an ethtool command that accesses the rss lut is
attempted immediately after reset, it will result in NULL ptr
dereference. Also, there is no need to reset the rss lut if the soft reset
does not involve queue count change.

After soft reset, set the RSS LUT to default values based on the updated
queue count only if the reset was a result of a queue count change and
the LUT was not configured by the user. In all other cases, don't touch
the LUT.

Steps to reproduce:

** Bring the interface down (if up)
ifconfig eth1 down

** update the queue count (eg., 27->20)
ethtool -L eth1 combined 20

** display the RSS LUT
ethtool -x eth1

[82375.558338] BUG: kernel NULL pointer dereference, address: 0000000000000000
[82375.558373] #PF: supervisor read access in kernel mode
[82375.558391] #PF: error_code(0x0000) - not-present page
[82375.558408] PGD 0 P4D 0
[82375.558421] Oops: Oops: 0000 [#1] SMP NOPTI
<snip>
[82375.558516] RIP: 0010:idpf_get_rxfh+0x108/0x150 [idpf]
[82375.558786] Call Trace:
[82375.558793]  <TASK>
[82375.558804]  rss_prepare.isra.0+0x187/0x2a0
[82375.558827]  rss_prepare_data+0x3a/0x50
[82375.558845]  ethnl_default_doit+0x13d/0x3e0
[82375.558863]  genl_family_rcv_msg_doit+0x11f/0x180
[82375.558886]  genl_rcv_msg+0x1ad/0x2b0
[82375.558902]  ? __pfx_ethnl_default_doit+0x10/0x10
[82375.558920]  ? __pfx_genl_rcv_msg+0x10/0x10
[82375.558937]  netlink_rcv_skb+0x58/0x100
[82375.558957]  genl_rcv+0x2c/0x50
[82375.558971]  netlink_unicast+0x289/0x3e0
[82375.558988]  netlink_sendmsg+0x215/0x440
[82375.559005]  __sys_sendto+0x234/0x240
[82375.559555]  __x64_sys_sendto+0x28/0x30
[82375.560068]  x64_sys_call+0x1909/0x1da0
[82375.560576]  do_syscall_64+0x7a/0xfa0
[82375.561076]  ? clear_bhb_loop+0x60/0xb0
[82375.561567]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
<snip>

Fixes: 02cbfba1ad ("idpf: add ethtool callbacks")
Signed-off-by: Sreedevi Joshi <sreedevi.joshi@intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Reviewed-by: Emil Tantilov <emil.s.tantilov@intel.com>
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 ptr issue after soft reset 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.