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Junrui Luo c54091eec6 caif: fix integer underflow in cffrml_receive() 
[ Upstream commit 8a11ff0948 ]

The cffrml_receive() function extracts a length field from the packet
header and, when FCS is disabled, subtracts 2 from this length without
validating that len >= 2.

If an attacker sends a malicious packet with a length field of 0 or 1
to an interface with FCS disabled, the subtraction causes an integer
underflow.

This can lead to memory exhaustion and kernel instability, potential
information disclosure if padding contains uninitialized kernel memory.

Fix this by validating that len >= 2 before performing the subtraction.

Reported-by: Yuhao Jiang <danisjiang@gmail.com>
Reported-by: Junrui Luo <moonafterrain@outlook.com>
Fixes: b482cd2053 ("net-caif: add CAIF core protocol stack")
Signed-off-by: Junrui Luo <moonafterrain@outlook.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/SYBPR01MB7881511122BAFEA8212A1608AFA6A@SYBPR01MB7881.ausprd01.prod.outlook.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-01-19 13:09:44 +01:00
arch x86/ptrace: Always inline trivial accessors 2026-01-19 13:09:41 +01:00
block blk-mq: Abort suspend when wakeup events are pending 2026-01-19 13:09:39 +01:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id 2026-01-19 13:09:24 +01:00
Documentation fs_context: drop the unused lsm_flags member 2026-01-19 13:09:38 +01:00
drivers broadcom: b44: prevent uninitialized value usage 2026-01-19 13:09:43 +01:00
fs btrfs: scrub: always update btrfs_scrub_progress::last_physical 2026-01-19 13:09:42 +01:00
include efi/cper: align ARM CPER type with UEFI 2.9A/2.10 specs 2026-01-19 13:09:40 +01:00
init init: handle bootloader identifier in kernel parameters 2025-10-19 16:21:45 +02:00
io_uring io_uring: fix possible deadlock in io_register_iowq_max_workers() 2024-11-17 15:06:25 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:05:26 +01:00
kernel livepatch: Match old_sympos 0 and 1 in klp_find_func() 2026-01-19 13:09:42 +01:00
lib lib/vsprintf: Check pointer before dereferencing in time_and_date() 2026-01-19 13:09:29 +01:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm/secretmem: fix use-after-free race in fault handler 2025-12-07 06:09:32 +09:00
net
samples samples: mei: Fix building on musl libc 2025-08-28 16:24:07 +02:00
scripts Makefile.compiler: replace cc-ifversion with compiler-specific macros 2025-12-07 06:09:32 +09:00
security ima: Handle error code returned by ima_filter_rule_match() 2026-01-19 13:09:31 +01:00
sound ASoC: fsl_xcvr: get channel status data when PHY is not exists 2026-01-19 13:09:40 +01:00
tools perf tools: Fix split kallsyms DSO counting 2026-01-19 13:09:36 +01:00
usr kbuild: hdrcheck: fix cross build with clang 2025-06-27 11:05:22 +01:00
virt KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin() 2024-10-22 15:40:41 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Remove *.orig pattern from .gitignore 2024-10-17 15:11:10 +02:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
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 06:09:36 +09:00
Makefile Linux 5.15.197 2025-12-07 06:09:37 +09:00
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.