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Kuniyuki Iwashima 992b2ac783 kcm: Fix error handling for SOCK_DGRAM in kcm_sendmsg(). 
[ Upstream commit a22730b1b4 ]

syzkaller found a memory leak in kcm_sendmsg(), and commit c821a88bd7
("kcm: Fix memory leak in error path of kcm_sendmsg()") suppressed it by
updating kcm_tx_msg(head)->last_skb if partial data is copied so that the
following sendmsg() will resume from the skb.

However, we cannot know how many bytes were copied when we get the error.
Thus, we could mess up the MSG_MORE queue.

When kcm_sendmsg() fails for SOCK_DGRAM, we should purge the queue as we
do so for UDP by udp_flush_pending_frames().

Even without this change, when the error occurred, the following sendmsg()
resumed from a wrong skb and the queue was messed up.  However, we have
yet to get such a report, and only syzkaller stumbled on it.  So, this
can be changed safely.

Note this does not change SOCK_SEQPACKET behaviour.

Fixes: c821a88bd7 ("kcm: Fix memory leak in error path of kcm_sendmsg()")
Fixes: ab7ac4eb98 ("kcm: Kernel Connection Multiplexor module")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://lore.kernel.org/r/20230912022753.33327-1-kuniyu@amazon.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-09-19 12:30:30 +02:00
arch parisc: sba_iommu: Fix build warning if procfs if disabled 2023-09-19 12:30:27 +02:00
block blk-throttle: consider 'carryover_ios/bytes' in throtl_trim_slice() 2023-09-19 12:30:16 +02:00
certs KEYS: Add missing function documentation 2023-04-24 16:15:52 +03:00
crypto crypto: af_alg - Decrement struct key.usage in alg_set_by_key_serial() 2023-09-13 09:53:55 +02:00
Documentation dt-bindings: clock: xlnx,versal-clk: drop select:false 2023-09-19 12:30:11 +02:00
drivers net: renesas: rswitch: Fix unmasking irq condition 2023-09-19 12:30:30 +02:00
fs btrfs: scrub: fix grouping of read IO 2023-09-19 12:30:24 +02:00
include tcp: Fix bind() regression for v4-mapped-v6 wildcard address. 2023-09-19 12:30:29 +02:00
init sched/psi: Select KERNFS as needed 2023-09-13 09:52:59 +02:00
io_uring io_uring: Don't set affinity on a dying sqpoll thread 2023-09-13 09:53:52 +02:00
ipc Merge branch 'work.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2023-02-24 19:20:07 -08:00
kernel bpf: fix bpf_probe_read_kernel prototype mismatch 2023-09-19 12:30:26 +02:00
lib kunit: Fix wild-memory-access bug in kunit_free_suite_set() 2023-09-19 12:30:27 +02:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm memcontrol: ensure memcg acquired by id is properly set up 2023-09-19 12:30:23 +02:00
net kcm: Fix error handling for SOCK_DGRAM in kcm_sendmsg(). 2023-09-19 12:30:30 +02:00
rust rust: macros: vtable: fix HAS_* redefinition (gen_const_name) 2023-08-09 21:15:07 +02:00
samples samples/bpf: fix broken map lookup probe 2023-09-13 09:53:09 +02:00
scripts linux/export: fix reference to exported functions for parisc64 2023-09-19 12:30:21 +02:00
security smackfs: Prevent underflow in smk_set_cipso() 2023-09-13 09:53:22 +02:00
sound ASoC: tegra: Fix SFC conversion for few rates 2023-09-19 12:30:10 +02:00
tools selftest: tcp: Fix address length in bind_wildcard.c. 2023-09-19 12:30:29 +02:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt kvm/vfio: ensure kvg instance stays around in kvm_vfio_group_add() 2023-09-13 09:53:29 +02:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Revert ".gitignore: ignore *.cover and *.mbx" 2023-07-04 15:05:12 -07:00
.mailmap mailmap: add entries for Simon Horman 2023-08-16 09:53:10 +01:00
.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 - Address -Wmissing-prototype warnings 2023-06-26 16:43:54 -07:00
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 sound fixes for 6.5 2023-08-25 08:48:14 -07:00
Makefile kbuild: do not run depmod for 'make modules_sign' 2023-09-19 12:30:12 +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.