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Eric Dumazet b9f915340f ip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl_rcv() 
[ Upstream commit 81c734dae2 ]

Blamed commit did not take care of VLAN encapsulations
as spotted by syzbot [1].

Use skb_vlan_inet_prepare() instead of pskb_inet_may_pull().

[1]
 BUG: KMSAN: uninit-value in __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]
 BUG: KMSAN: uninit-value in INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]
 BUG: KMSAN: uninit-value in IP6_ECN_decapsulate+0x7a8/0x1fa0 include/net/inet_ecn.h:321
  __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]
  INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]
  IP6_ECN_decapsulate+0x7a8/0x1fa0 include/net/inet_ecn.h:321
  ip6ip6_dscp_ecn_decapsulate+0x16f/0x1b0 net/ipv6/ip6_tunnel.c:729
  __ip6_tnl_rcv+0xed9/0x1b50 net/ipv6/ip6_tunnel.c:860
  ip6_tnl_rcv+0xc3/0x100 net/ipv6/ip6_tunnel.c:903
 gre_rcv+0x1529/0x1b90 net/ipv6/ip6_gre.c:-1
  ip6_protocol_deliver_rcu+0x1c89/0x2c60 net/ipv6/ip6_input.c:438
  ip6_input_finish+0x1f4/0x4a0 net/ipv6/ip6_input.c:489
  NF_HOOK include/linux/netfilter.h:318 [inline]
  ip6_input+0x9c/0x330 net/ipv6/ip6_input.c:500
  ip6_mc_input+0x7ca/0xc10 net/ipv6/ip6_input.c:590
  dst_input include/net/dst.h:474 [inline]
  ip6_rcv_finish+0x958/0x990 net/ipv6/ip6_input.c:79
  NF_HOOK include/linux/netfilter.h:318 [inline]
  ipv6_rcv+0xf1/0x3c0 net/ipv6/ip6_input.c:311
  __netif_receive_skb_one_core net/core/dev.c:6139 [inline]
  __netif_receive_skb+0x1df/0xac0 net/core/dev.c:6252
  netif_receive_skb_internal net/core/dev.c:6338 [inline]
  netif_receive_skb+0x57/0x630 net/core/dev.c:6397
  tun_rx_batched+0x1df/0x980 drivers/net/tun.c:1485
  tun_get_user+0x5c0e/0x6c60 drivers/net/tun.c:1953
  tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1999
  new_sync_write fs/read_write.c:593 [inline]
  vfs_write+0xbe2/0x15d0 fs/read_write.c:686
  ksys_write fs/read_write.c:738 [inline]
  __do_sys_write fs/read_write.c:749 [inline]
  __se_sys_write fs/read_write.c:746 [inline]
  __x64_sys_write+0x1fb/0x4d0 fs/read_write.c:746
  x64_sys_call+0x30ab/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:2
  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
  do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
  slab_post_alloc_hook mm/slub.c:4960 [inline]
  slab_alloc_node mm/slub.c:5263 [inline]
  kmem_cache_alloc_node_noprof+0x9e7/0x17a0 mm/slub.c:5315
  kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:586
  __alloc_skb+0x805/0x1040 net/core/skbuff.c:690
  alloc_skb include/linux/skbuff.h:1383 [inline]
  alloc_skb_with_frags+0xc5/0xa60 net/core/skbuff.c:6712
  sock_alloc_send_pskb+0xacc/0xc60 net/core/sock.c:2995
  tun_alloc_skb drivers/net/tun.c:1461 [inline]
  tun_get_user+0x1142/0x6c60 drivers/net/tun.c:1794
  tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1999
  new_sync_write fs/read_write.c:593 [inline]
  vfs_write+0xbe2/0x15d0 fs/read_write.c:686
  ksys_write fs/read_write.c:738 [inline]
  __do_sys_write fs/read_write.c:749 [inline]
  __se_sys_write fs/read_write.c:746 [inline]
  __x64_sys_write+0x1fb/0x4d0 fs/read_write.c:746
  x64_sys_call+0x30ab/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:2
  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
  do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 6465 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(none)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025

Fixes: 8d975c15c0 ("ip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()")
Reported-by: syzbot+d4dda070f833dc5dc89a@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/netdev/695e88b2.050a0220.1c677c.036d.GAE@google.com/T/#u
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260107163109.4188620-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-01-23 11:21:16 +01:00
arch x86/fpu: Clear XSTATE_BV[i] in guest XSAVE state whenever XFD[i]=1 2026-01-23 11:21:12 +01:00
block block: validate pi_offset integrity limit 2026-01-17 16:35:33 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: seqiv - Do not use req->iv after crypto_aead_encrypt 2026-01-08 10:16:43 +01:00
Documentation dt-bindings: PCI: qcom,pcie-sm8550: Add missing required power-domains and resets 2026-01-02 12:57:27 +01:00
drivers cxl/port: Fix target list setup for multiple decoders sharing the same dport 2026-01-23 11:21:15 +01:00
fs btrfs: send: check for inline extents in range_is_hole_in_parent() 2026-01-23 11:21:15 +01:00
include ipv4: ip_tunnel: spread netdev_lockdep_set_classes() 2026-01-23 11:21:15 +01:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring: move local task_work in exit cancel loop 2026-01-23 11:21:13 +01:00
ipc namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
kernel trace: ftrace_dump_on_oops[] is not exported, make it static 2026-01-17 16:35:29 +01:00
lib lib/crypto: aes: Fix missing MMU protection for AES S-box 2026-01-17 16:35:12 +01:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm mm/damon/tests/core-kunit: handle alloc failures on damon_test_split_regions_of() 2026-01-08 10:17:21 +01:00
net
rust rust: bitops: fix missing _find_* functions on 32-bit ARM 2026-01-23 11:21:12 +01:00
samples samples/ftrace: Adjust LoongArch register restore order in direct calls 2026-01-08 10:17:11 +01:00
scripts mcb: Add missing modpost build support 2026-01-08 10:16:47 +01:00
security kernel/kexec: change the prototype of kimage_map_segment() 2026-01-08 10:17:10 +01:00
sound ASoC: codecs: wsa883x: fix unnecessary initialisation 2026-01-23 11:21:13 +01:00
tools selftests: drv-net: Bring back tool() to driver __init__s 2026-01-17 16:35:28 +01:00
usr gen_init_cpio: Ignore fsync() returning EINVAL on pipes 2025-10-07 09:53:05 -07:00
virt KVM: Fix last_boosted_vcpu index assignment bug 2026-01-02 12:57:21 +01:00
.clang-format memblock: drop for_each_free_mem_pfn_range_in_zone_from() 2025-09-14 08:49:03 +03:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.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 MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore compile_commands.json globally 2025-08-12 15:53:55 -07:00
.mailmap 8 hotfixes. 4 are cc:stable, 7 are against mm/. 2025-11-26 12:38:05 -08:00
.pylintrc tools: docs: parse-headers.py: move it from sphinx dir 2025-08-29 15:54:42 -06:00
.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: mark ISDN subsystem as orphan 2025-10-27 17:49:45 -07:00
Kbuild sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS soc: fixes for 6.18, part 4 2025-11-28 09:57:31 -08:00
Makefile Linux 6.18.6 2026-01-17 16:35:34 +01:00
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.