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Alexander Egorenkov 23a523ef40 net/af_iucv: remove WARN_ONCE on malformed RX packets commit `27e9c1de52` upstream. syzbot reported the following finding: AF_IUCV failed to receive skb, len=0 WARNING: CPU: 0 PID: 522 at net/iucv/af_iucv.c:2039 afiucv_hs_rcv+0x174/0x190 net/iucv/af_iucv.c:2039 CPU: 0 PID: 522 Comm: syz-executor091 Not tainted 5.10.0-rc1-syzkaller-07082-g55027a88ec9f #0 Hardware name: IBM 3906 M04 701 (KVM/Linux) Call Trace: [<00000000b87ea538>] afiucv_hs_rcv+0x178/0x190 net/iucv/af_iucv.c:2039 ([<00000000b87ea534>] afiucv_hs_rcv+0x174/0x190 net/iucv/af_iucv.c:2039) [<00000000b796533e>] __netif_receive_skb_one_core+0x13e/0x188 net/core/dev.c:5315 [<00000000b79653ce>] __netif_receive_skb+0x46/0x1c0 net/core/dev.c:5429 [<00000000b79655fe>] netif_receive_skb_internal+0xb6/0x220 net/core/dev.c:5534 [<00000000b796ac3a>] netif_receive_skb+0x42/0x318 net/core/dev.c:5593 [<00000000b6fd45f4>] tun_rx_batched.isra.0+0x6fc/0x860 drivers/net/tun.c:1485 [<00000000b6fddc4e>] tun_get_user+0x1c26/0x27f0 drivers/net/tun.c:1939 [<00000000b6fe0f00>] tun_chr_write_iter+0x158/0x248 drivers/net/tun.c:1968 [<00000000b4f22bfa>] call_write_iter include/linux/fs.h:1887 [inline] [<00000000b4f22bfa>] new_sync_write+0x442/0x648 fs/read_write.c:518 [<00000000b4f238fe>] vfs_write.part.0+0x36e/0x5d8 fs/read_write.c:605 [<00000000b4f2984e>] vfs_write+0x10e/0x148 fs/read_write.c:615 [<00000000b4f29d0e>] ksys_write+0x166/0x290 fs/read_write.c:658 [<00000000b8dc4ab4>] system_call+0xe0/0x28c arch/s390/kernel/entry.S:415 Last Breaking-Event-Address: [<00000000b8dc64d4>] __s390_indirect_jump_r14+0x0/0xc Malformed RX packets shouldn't generate any warnings because debugging info already flows to dropmon via the kfree_skb(). Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Reviewed-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2021-03-07 12:34:05 +01:00
arch	x86/build: Treat R_386_PLT32 relocation as R_386_PC32	2021-03-07 12:34:04 +01:00
block	blk-settings: align max_sectors on "logical_block_size" boundary	2021-03-04 11:38:22 +01:00
certs	certs: Fix blacklist flag type confusion	2021-03-04 11:37:59 +01:00
crypto	crypto: michael_mic - fix broken misalignment handling	2021-03-04 11:38:31 +01:00
Documentation	mm/vmscan: restore zone_reclaim_mode ABI	2021-03-04 11:38:38 +01:00
drivers	media: v4l2-ctrls.c: fix shift-out-of-bounds in std_validate	2021-03-07 12:34:05 +01:00
fs	xfs: Fix assert failure in xfs_setattr_size()	2021-03-07 12:34:05 +01:00
include	net_sched: fix RTNL deadlock again caused by request_module()	2021-03-04 11:38:47 +01:00
init	kgdb: fix to kill breakpoints on initmem after boot	2021-03-04 11:38:46 +01:00
ipc	ipc: adjust proc_ipc_sem_dointvec definition to match prototype	2020-09-05 12:14:29 -07:00
kernel	sched/core: Allow try_invoke_on_locked_down_task() with irqs disabled	2021-03-07 12:34:04 +01:00
lib	udp: fix skb_copy_and_csum_datagram with odd segment sizes	2021-02-17 11:02:28 +01:00
LICENSES	LICENSES/deprecated: add Zlib license text	2020-09-16 14:33:49 +02:00
mm	mm, compaction: make fast_isolate_freepages() stay within zone	2021-03-04 11:38:38 +01:00
net	net/af_iucv: remove WARN_ONCE on malformed RX packets	2021-03-07 12:34:05 +01:00
samples	watch_queue: Drop references to /dev/watch_queue	2021-03-04 11:37:59 +01:00
scripts	scripts/recordmcount.pl: support big endian for ARCH sh	2021-02-26 10:13:02 +01:00
security	KEYS: trusted: Reserve TPM for seal and unseal operations	2021-03-04 11:38:29 +01:00
sound	ASoC: siu: Fix build error by a wrong const prefix	2021-03-04 11:38:28 +01:00
tools	wireguard: selftests: test multiple parallel streams	2021-03-04 11:38:47 +01:00
usr	Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-08-07 13:29:39 -07:00
virt	KVM: Use kvm_pfn_t for local PFN variable in hva_to_pfn_remapped()	2021-02-26 10:13:01 +01:00
.clang-format	RDMA 5.10 pull request	2020-10-17 11:18:18 -07:00
.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	.gitignore: docs: ignore sphinx_*/ directories	2020-09-10 10:44:31 -06:00
.mailmap	mailmap: add two more addresses of Uwe Kleine-König	2020-12-06 10:19:07 -08:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Jason Cooper to CREDITS	2020-11-30 10:20:34 +01:00
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	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-12-10 15:30:13 -08:00
Makefile	Linux 5.10.20	2021-03-04 11:38:47 +01:00
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.