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Paolo Abeni d87903b63e mptcp: fix DATA_FIN generation on early shutdown
If the msk is closed before sending or receiving any data,
no DATA_FIN is generated, instead an MPC ack packet is
crafted out.

In the above scenario, the MPTCP protocol creates and sends a
pure ack and such packets matches also the criteria for an
MPC ack and the protocol tries first to insert MPC options,
leading to the described error.

This change addresses the issue by avoiding the insertion of an
MPC option for DATA_FIN packets or if the sub-flow is not
established.

To avoid doing multiple times the same test, fetch the data_fin
flag in a bool variable and pass it to both the interested
helpers.

Fixes: 6d0060f600 ("mptcp: Write MPTCP DSS headers to outgoing data packets")
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-02-22 18:54:59 -08:00
arch The performance event updates for v5.12 are: 2021-02-21 12:49:32 -08:00
block for-5.12/block-2021-02-17 2021-02-21 11:02:48 -08:00
certs .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
crypto X.509: Fix crash caused by NULL pointer 2021-01-20 11:33:51 -08:00
Documentation The performance event updates for v5.12 are: 2021-02-21 12:49:32 -08:00
drivers net: phy: icplus: call phy_restore_page() when phy_select_page() fails 2021-02-22 18:47:48 -08:00
fs These changes fix MM (soft-)dirty bit management in the procfs code & clean up the API. 2021-02-21 12:19:56 -08:00
include The performance event updates for v5.12 are: 2021-02-21 12:49:32 -08:00
init Scheduler updates for v5.12: 2021-02-21 12:35:04 -08:00
ipc Merge branch 'akpm' (patches from Andrew) 2020-12-15 12:53:37 -08:00
kernel The performance event updates for v5.12 are: 2021-02-21 12:49:32 -08:00
lib Scheduler updates for v5.12: 2021-02-21 12:35:04 -08:00
LICENSES LICENSES: Add the CC-BY-4.0 license 2020-12-08 10:33:27 -07:00
mm These changes fix MM (soft-)dirty bit management in the procfs code & clean up the API. 2021-02-21 12:19:56 -08:00
net mptcp: fix DATA_FIN generation on early shutdown 2021-02-22 18:54:59 -08:00
samples samples: bpf: Remove unneeded semicolon 2021-02-02 21:37:59 -08:00
scripts These are the v5.12 updates for the locking subsystem: 2021-02-21 12:12:01 -08:00
security cap: fix conversions on getxattr 2021-01-28 10:22:48 +01:00
sound Merge branches 'acpi-misc', 'acpi-cppc', 'acpi-docs', 'acpi-config' and 'acpi-apei' 2021-02-15 17:04:40 +01:00
tools Scheduler updates for v5.12: 2021-02-21 12:35:04 -08:00
usr arch: ia64: Remove rest of perfmon support 2021-01-22 12:12:20 +05:30
virt KVM/arm64 fixes for 5.11, take #2 2021-01-25 18:52:01 -05:00
.clang-format clang-format: Update with the latest for_each macro list 2021-01-29 15:00:23 +01:00
.cocciconfig
.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 .gitignore: docs: ignore sphinx_*/ directories 2020-09-10 10:44:31 -06:00
.mailmap MAINTAINERS: update Andrey Ryabinin's email address 2021-02-09 17:26:44 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: dccp: move Gerrit Renker to CREDITS 2021-01-14 10:53:49 -08:00
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 These are the v5.12 updates for the locking subsystem: 2021-02-21 12:12:01 -08:00
Makefile Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2021-02-20 17:45:32 -08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.