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Maoyi Xie 70d6d4cfa4 ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser 
commit f7f3f9fd81 upstream.

snd_usb_caiaq_tks4_dispatch() decodes the Traktor Kontrol S4 input
stream in fixed 16-byte (TKS4_MSGBLOCK_SIZE) message blocks. On every
iteration it advances buf and subtracts the block size while looping on
"while (len)".

len is urb->actual_length. That value is supplied by the device and is
not guaranteed to be a multiple of 16. When a final short block leaves
len between 1 and 15, the loop runs once more, reads up to buf[15], and
then does "len -= TKS4_MSGBLOCK_SIZE". As len is unsigned this underflows
to a huge value. The loop then keeps iterating and walking buf far past
the end of the 512-byte ep4_in_buf, reading out of bounds until a bogus
block id happens to be hit.

Iterate only while a full message block is available. This stops the
unsigned underflow and silently drops any trailing partial block, which
carries no complete control value anyway.

The sibling endpoint-4 parsers are not affected. The Traktor Kontrol X1
and Maschine arms in snd_usb_caiaq_ep4_reply_dispatch() floor
urb->actual_length before dispatching.

Fixes: 15c5ab6070 ("ALSA: snd-usb-caiaq: Add support for Traktor Kontrol S4")
Cc: stable@vger.kernel.org
Signed-off-by: Maoyi Xie <maoyixie.tju@gmail.com>
Link: https://patch.msgid.link/178176259547.3343534.2724779296835237429@maoyixie.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-07-24 15:51:19 +02:00
arch KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path 2026-07-04 13:39:40 +02:00
block block: Avoid mounting the bdev pseudo-filesystem in userspace 2026-07-24 15:51:17 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto crypto: af_alg - Set merge to zero early in af_alg_sendmsg 2026-07-04 13:39:39 +02:00
Documentation crypto: qat - remove unused character device and IOCTLs 2026-07-04 13:39:41 +02:00
drivers iio: temperature: ltc2983: Fix reinit_completion() called after conversion start 2026-07-24 15:51:19 +02:00
fs ksmbd: fix out-of-bounds read in smb_check_perm_dacl() 2026-07-24 15:51:17 +02:00
include device property: initialize the remaining fields of fwnode_handle in fwnode_init() 2026-07-24 15:51:16 +02:00
init randomize_kstack: Maintain kstack_offset per task 2026-06-19 13:33:41 +02:00
io_uring io_uring/poll: fix signed comparison in io_poll_get_ownership() 2026-06-19 13:33:39 +02:00
ipc ipc/shm: serialize orphan cleanup with shm_nattch updates 2026-06-19 13:33:38 +02:00
kernel locking/rtmutex: Skip remove_waiter() when waiter is not enqueued 2026-07-24 15:51:17 +02:00
lib lib/crypto: mpi: Fix integer underflow in mpi_read_raw_from_sgl() 2026-06-19 13:33:39 +02:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm/huge_memory: update file PMD counter before folio_put() 2026-06-19 13:33:49 +02:00
net net: ip_gre: require CAP_NET_ADMIN in the device netns for changelink 2026-07-24 15:51:16 +02:00
samples samples: mei: Fix building on musl libc 2025-08-28 16:24:07 +02:00
scripts scripts/dtc: Remove unused dts_version in dtc-lexer.l 2026-06-01 17:35:12 +02:00
security apparmor: mediate the implicit connect of TCP fast open sendmsg 2026-07-24 15:51:16 +02:00
sound ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser 2026-07-24 15:51:19 +02:00
tools kselftest/arm64: signal: Skip SVE signal test if not enough VLs supported 2026-07-04 13:39:37 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-06-27 11:05:22 +01:00
virt KVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with get_unaligned() 2026-07-24 15:51:16 +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 5.15.211 2026-07-04 13:39:41 +02:00
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.