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Ovidiu Panait 7441d70d5c staging: axis-fifo: fix TX handling on copy_from_user() failure 
commit 6d07bee10e upstream.

If copy_from_user() fails, write() currently returns -EFAULT, but any
partially written data leaves the TX FIFO in an inconsistent state.
Subsequent write() calls then fail with "transmit length mismatch"
errors.

Once partial data is written to the hardware FIFO, it cannot be removed
without a TX reset. Commit c6e8d85faf ("staging: axis-fifo: Remove
hardware resets for user errors") removed a full FIFO reset for this case,
which fixed a potential RX data loss, but introduced this TX issue.

Fix this by introducing a bounce buffer: copy the full packet from
userspace first, and write to the hardware FIFO only if the copy
was successful.

Fixes: c6e8d85faf ("staging: axis-fifo: Remove hardware resets for user errors")
Cc: stable@vger.kernel.org
Signed-off-by: Ovidiu Panait <ovidiu.panait.oss@gmail.com>
Link: https://lore.kernel.org/r/20250912101322.1282507-1-ovidiu.panait.oss@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-10-12 12:57:18 +02:00
arch arm64: dts: marvell: cn9132-clearfog: fix multi-lane pci x2 and x4 ports 2025-10-02 13:44:14 +02:00
block block: add a queue_limits_commit_update_frozen helper 2025-09-09 18:58:24 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: af_alg - Set merge to zero early in af_alg_sendmsg 2025-09-25 11:13:49 +02:00
Documentation platform/x86: lg-laptop: Fix WMAB call in fan_mode_store() 2025-10-02 13:44:12 +02:00
drivers
fs netfs: Prevent duplicate unlocking 2025-10-12 12:57:17 +02:00
include crypto: sha256 - fix crash at kexec 2025-10-06 11:17:51 +02:00
init io_uring: fix breakage in EXPERT menu 2025-08-15 12:13:32 +02:00
io_uring io_uring: fix incorrect io_kiocb reference in io_link_skb 2025-09-25 11:13:49 +02:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel tracing: dynevent: Add a missing lockdown check on dynevent 2025-10-02 13:44:13 +02:00
lib lib/sbitmap: convert shallow_depth from one word to the whole sbitmap 2025-08-20 18:30:49 +02:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm: swap: check for stable address space before operating on the VMA 2025-10-06 11:17:52 +02:00
net nexthop: Forbid FDB status change while nexthop is in a group 2025-10-02 13:44:10 +02:00
rust rust: block: fix srctree/ links 2025-10-12 12:57:16 +02:00
samples ftrace/samples: Fix function size computation 2025-09-19 16:35:44 +02:00
scripts gcc-plugins: Remove TODO_verify_il for GCC >= 16 2025-10-06 11:17:52 +02:00
security apparmor: Fix 8-byte alignment for initial dfa blob streams 2025-08-28 16:30:56 +02:00
sound ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free 2025-10-12 12:57:18 +02:00
tools perf subcmd: avoid crash in exclude_cmds when excludes is empty 2025-10-12 12:57:16 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-13 13:02:18 +01:00
virt KVM: Allow CPU to reschedule while setting per-page memory attributes 2025-07-17 18:37:08 +02:00
.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 MAINTAINERS: Update Alexey Makhalov's email address 2025-05-22 14:29:46 +02:00
Makefile Linux 6.12.51 2025-10-06 11:17:53 +02:00
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.