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linux/include/net/netfilter
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Eric Dumazet a3aea97d55 netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto() 
[ Upstream commit 18cdb3d982 ]

syzbot found a potential access to uninit-value in nf_flow_pppoe_proto()

Blamed commit forgot the Ethernet header.

BUG: KMSAN: uninit-value in nf_flow_offload_inet_hook+0x7e4/0x940 net/netfilter/nf_flow_table_inet.c:27
  nf_flow_offload_inet_hook+0x7e4/0x940 net/netfilter/nf_flow_table_inet.c:27
  nf_hook_entry_hookfn include/linux/netfilter.h:157 [inline]
  nf_hook_slow+0xe1/0x3d0 net/netfilter/core.c:623
  nf_hook_ingress include/linux/netfilter_netdev.h:34 [inline]
  nf_ingress net/core/dev.c:5742 [inline]
  __netif_receive_skb_core+0x4aff/0x70c0 net/core/dev.c:5837
  __netif_receive_skb_one_core net/core/dev.c:5975 [inline]
  __netif_receive_skb+0xcc/0xac0 net/core/dev.c:6090
  netif_receive_skb_internal net/core/dev.c:6176 [inline]
  netif_receive_skb+0x57/0x630 net/core/dev.c:6235
  tun_rx_batched+0x1df/0x980 drivers/net/tun.c:1485
  tun_get_user+0x4ee0/0x6b40 drivers/net/tun.c:1938
  tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1984
  new_sync_write fs/read_write.c:593 [inline]
  vfs_write+0xb4b/0x1580 fs/read_write.c:686
  ksys_write fs/read_write.c:738 [inline]
  __do_sys_write fs/read_write.c:749 [inline]

Reported-by: syzbot+bf6ed459397e307c3ad2@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/netdev/686bc073.a00a0220.c7b3.0086.GAE@google.com/T/#u
Fixes: 87b3593bed ("netfilter: flowtable: validate pppoe header")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Pablo Neira Ayuso <pablo@netfilter.org>
Link: https://patch.msgid.link/20250707124517.614489-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-07-17 18:30:53 +02:00
..
ipv4 netfilter: disable defrag once its no longer needed 2021-04-26 03:20:07 +02:00
ipv6 netfilter: conntrack: fix boot failure with nf_conntrack.enable_hooks=1 2021-09-28 13:04:55 +02:00
br_netfilter.h netfilter: remove CONFIG_NETFILTER checks from headers. 2019-09-13 12:47:36 +02:00
nf_conntrack.h netfilter: let reset rules clean out conntrack entries 2024-03-06 14:38:46 +00:00
nf_conntrack_acct.h netfilter: conntrack: add nf_ct_acct_add() 2020-03-30 02:05:39 +02:00
nf_conntrack_bridge.h netfilter: remove CONFIG_NETFILTER checks from headers. 2019-09-13 12:47:36 +02:00
nf_conntrack_core.h netfilter: conntrack: re-fetch conntrack after insertion 2022-06-06 08:43:38 +02:00
nf_conntrack_count.h netfilter: add missing includes to a number of header-files. 2019-08-13 12:14:39 +02:00
nf_conntrack_ecache.h netfilter: ecache: remove nf_exp_event_notifier structure 2021-08-25 12:50:38 +02:00
nf_conntrack_expect.h netfilter: fix coding-style errors. 2019-09-13 11:39:38 +02:00
nf_conntrack_extend.h netfilter: Replace zero-length array with flexible-array member 2020-03-15 15:20:16 +01:00
nf_conntrack_helper.h netfilter: conntrack: Add and use nf_ct_set_auto_assign_helper_warned() 2022-04-08 14:23:42 +02:00
nf_conntrack_l4proto.h netfilter: conntrack: pass hook state to log functions 2021-06-18 14:47:43 +02:00
nf_conntrack_labels.h netfilter: fix include guards. 2019-09-13 11:39:38 +02:00
nf_conntrack_seqadj.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nf_conntrack_synproxy.h netfilter: conntrack: wrap two inline functions in config checks. 2019-09-13 12:47:10 +02:00
nf_conntrack_timeout.h netfilter: Replace zero-length array with flexible-array member 2020-03-15 15:20:16 +01:00
nf_conntrack_timestamp.h netfilter: conntrack: remove two unused functions from nf_conntrack_timestamp.h. 2019-09-13 12:48:09 +02:00
nf_conntrack_tuple.h netfilter: remove CONFIG_NETFILTER checks from headers. 2019-09-13 12:47:36 +02:00
nf_conntrack_zones.h netfilter: conntrack: remove CONFIG_NF_CONNTRACK checks from nf_conntrack_zones.h. 2019-09-13 12:47:41 +02:00
nf_dup_netdev.h netfilter: nft_{fwd,dup}_netdev: add offload support 2019-09-10 22:44:29 +02:00
nf_flow_table.h netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto() 2025-07-17 18:30:53 +02:00
nf_hooks_lwtunnel.h netfilter: add netfilter hooks to SRv6 data plane 2021-08-30 01:51:36 +02:00
nf_log.h netfilter: nf_log_common: merge with nf_log_syslog 2021-03-31 22:34:10 +02:00
nf_nat.h netfilter: nat: move nf_xfrm_me_harder to where it is used 2021-04-26 03:20:07 +02:00
nf_nat_helper.h netfilter: add missing includes to a number of header-files. 2019-08-13 12:14:39 +02:00
nf_nat_masquerade.h netfilter: update include directives. 2019-09-13 12:33:06 +02:00
nf_nat_redirect.h netfilter: nft_redir: use struct nf_nat_range2 throughout and deduplicate eval call-backs 2023-11-20 11:08:29 +01:00
nf_queue.h netfilter: nf_queue: fix possible use-after-free 2022-03-08 19:12:45 +01:00
nf_reject.h netfilter: add missing includes to a number of header-files. 2019-08-13 12:14:39 +02:00
nf_socket.h netfilter: Decrease code duplication regarding transparent socket option 2018-06-03 00:02:01 +02:00
nf_synproxy.h netfilter: remove CONFIG_NETFILTER checks from headers. 2019-09-13 12:47:36 +02:00
nf_tables.h netfilter: nf_tables: do not defer rule destruction via call_rcu 2025-05-22 14:08:28 +02:00
nf_tables_core.h netfilter: nft_payload: move struct nft_payload_set definition where it belongs 2024-06-16 13:39:50 +02:00
nf_tables_ipv4.h netfilter: nf_tables: convert pktinfo->tprot_set to flags field 2022-07-12 16:34:55 +02:00
nf_tables_ipv6.h netfilter: nf_tables: convert pktinfo->tprot_set to flags field 2022-07-12 16:34:55 +02:00
nf_tables_offload.h netfilter: nf_tables: bail out early if hardware offload is not supported 2022-06-14 18:36:17 +02:00
nf_tproxy.h netfilter: tproxy: fix deadlock due to missing BH disable 2023-03-17 08:48:55 +01:00
nft_fib.h netfilter: nftables: add nft_parse_register_store() and use it 2021-01-27 23:16:02 +01:00
nft_meta.h netfilter: nftables: add nft_parse_register_store() and use it 2021-01-27 23:16:02 +01:00
nft_reject.h netfilter: add missing includes to a number of header-files. 2019-08-13 12:14:39 +02:00
xt_rateest.h netfilter: make xt_rateest hash table per net 2018-03-05 23:15:44 +01:00