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Code
ceddedc969
linux/net/ipv6
History
Florian Westphal 91a79b7922 netfilter: nf_reject: don't leak dst refcount for loopback packets 
recent patches to add a WARN() when replacing skb dst entry found an
old bug:

WARNING: include/linux/skbuff.h:1165 skb_dst_check_unset include/linux/skbuff.h:1164 [inline]
WARNING: include/linux/skbuff.h:1165 skb_dst_set include/linux/skbuff.h:1210 [inline]
WARNING: include/linux/skbuff.h:1165 nf_reject_fill_skb_dst+0x2a4/0x330 net/ipv4/netfilter/nf_reject_ipv4.c:234
[..]
Call Trace:
 nf_send_unreach+0x17b/0x6e0 net/ipv4/netfilter/nf_reject_ipv4.c:325
 nft_reject_inet_eval+0x4bc/0x690 net/netfilter/nft_reject_inet.c:27
 expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
 ..

This is because blamed commit forgot about loopback packets.
Such packets already have a dst_entry attached, even at PRE_ROUTING stage.

Instead of checking hook just check if the skb already has a route
attached to it.

Fixes: f53b9b0bdc ("netfilter: introduce support for reject at prerouting stage")
Signed-off-by: Florian Westphal <fw@strlen.de>
Link: https://patch.msgid.link/20250820123707.10671-1-fw@strlen.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2025-08-21 10:02:00 -07:00
..
ila ipv6: adopt dst_dev() helper 2025-07-02 14:32:30 -07:00
netfilter netfilter: nf_reject: don't leak dst refcount for loopback packets 2025-08-21 10:02:00 -07:00
addrconf_core.c ipv6: Ensure natural alignment of const ipv6 loopback and router addresses 2024-01-30 12:43:18 +01:00
addrconf.c Networking changes for 6.17. 2025-07-30 08:58:55 -07:00
addrlabel.c net: replace ADDRLABEL with dynamic debug 2025-07-08 15:04:05 +02:00
af_inet6.c net: annotate races around sk->sk_uid 2025-06-23 17:04:03 -07:00
ah6.c net: fill in MODULE_DESCRIPTION()s for ipv6 modules 2024-02-09 14:12:01 -08:00
anycast.c dev: Pass netdevice_tracker to dev_get_by_flags_rcu(). 2025-07-14 17:11:14 -07:00
calipso.c net: ipv6: Fix spelling mistake 2025-07-02 15:42:29 -07:00
datagram.c net: dst: annotate data-races around dst->obsolete 2025-07-02 14:32:29 -07:00
esp6_offload.c xfrm: Add an inbound percpu state cache. 2024-10-29 11:56:18 +01:00
esp6.c espintcp: remove encap socket caching to avoid reference leak 2025-04-14 11:59:17 +02:00
exthdrs_core.c ipv6: Fix out-of-bounds access in ipv6_find_tlv() 2023-05-24 08:43:39 +01:00
exthdrs_offload.c net: gso: add HBH extension header offload support 2024-01-05 08:11:49 -08:00
exthdrs.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
fib6_notifier.c net: do not acquire rtnl in fib_seq_sum() 2024-10-11 15:35:05 -07:00
fib6_rules.c ipv6: fib_rules: Add DSCP mask matching 2025-02-21 16:08:48 -08:00
fou6.c
icmp.c ipv6: adopt dst_dev() helper 2025-07-02 14:32:30 -07:00
inet6_connection_sock.c net: annotate races around sk->sk_uid 2025-06-23 17:04:03 -07:00
inet6_hashtables.c inet: call inet6_ehashfn() once from inet6_hash_connect() 2025-03-06 15:26:02 -08:00
ioam6_iptunnel.c ipv6: adopt dst_dev() helper 2025-07-02 14:32:30 -07:00
ioam6.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
ip6_checksum.c
ip6_fib.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-07-26 11:49:45 -07:00
ip6_flowlabel.c treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
ip6_gre.c ip6_gre: Factor out common ip6gre tunnel match into helper 2025-07-22 12:15:26 +02:00
ip6_icmp.c
ip6_input.c net: preserve MSG_ZEROCOPY with forwarding 2025-07-02 15:07:16 -07:00
ip6_offload.c ipv6: reject malicious packets in ipv6_gso_segment() 2025-08-01 14:40:53 -07:00
ip6_offload.h
ip6_output.c ipv6: add force_forwarding sysctl to enable per-interface forwarding 2025-07-25 13:06:19 -07:00
ip6_tunnel.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
ip6_udp_tunnel.c ipv6: adopt dst_dev() helper 2025-07-02 14:32:30 -07:00
ip6_vti.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
ip6mr.c ipv6: ip6_mc_input() and ip6_mr_input() cleanups 2025-07-02 14:32:30 -07:00
ipcomp6.c xfrm: delete x->tunnel as we delete x 2025-07-08 13:28:27 +02:00
ipv6_sockglue.c ipv6: Remove setsockopt_needs_rtnl(). 2025-07-08 18:32:39 -07:00
Kconfig net: ipv6: select DST_CACHE from IPV6_RPL_LWTUNNEL 2024-09-22 19:52:07 +01:00
Makefile net/tcp: Introduce TCP_AO setsockopt()s 2023-10-27 10:35:44 +01:00
mcast_snoop.c
mcast.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-07-17 11:00:33 -07:00
mip6.c net: fill in MODULE_DESCRIPTION()s for ipv6 modules 2024-02-09 14:12:01 -08:00
ndisc.c neighbour: Remove __pneigh_lookup(). 2025-07-17 16:25:21 -07:00
netfilter.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
output_core.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
ping.c net: annotate races around sk->sk_uid 2025-06-23 17:04:03 -07:00
proc.c minmax: add a few more MIN_T/MAX_T users 2024-07-28 13:41:14 -07:00
protocol.c
raw.c net: annotate races around sk->sk_uid 2025-06-23 17:04:03 -07:00
reassembly.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
route.c bpf-next-6.17 2025-07-30 09:58:50 -07:00
rpl_iptunnel.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-07-17 11:00:33 -07:00
rpl.c ipv6: rpl: Remove pskb(_may)?_pull() in ipv6_rpl_srh_rcv(). 2023-06-19 11:32:58 -07:00
seg6_hmac.c ipv6: sr: Fix MAC comparison to be constant-time 2025-08-20 19:32:30 -07:00
seg6_iptunnel.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
seg6_local.c ipv6: adopt dst_dev() helper 2025-07-02 14:32:30 -07:00
seg6.c ipv6: sr: restruct ifdefines 2024-05-30 18:29:38 -07:00
sit.c net: ipv4: Add a flags argument to iptunnel_xmit(), udp_tunnel_xmit_skb() 2025-06-17 18:18:44 -07:00
syncookies.c net: annotate races around sk->sk_uid 2025-06-23 17:04:03 -07:00
sysctl_net_ipv6.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
tcp_ao.c net/tcp: Wire up l3index to TCP-AO 2023-10-27 10:35:46 +01:00
tcp_ipv6.c net: track pfmemalloc drops via SKB_DROP_REASON_PFMEMALLOC 2025-07-18 16:59:05 -07:00
tcpv6_offload.c net: use sock_gen_put() when sk_state is TCP_TIME_WAIT 2025-05-01 07:00:19 -07:00
tunnel6.c net: fill in MODULE_DESCRIPTION()s for ipv6 modules 2024-02-09 14:12:01 -08:00
udp_impl.h udp: move udp_memory_allocated into net_aligned_data 2025-07-02 14:22:02 -07:00
udp_offload.c udp_tunnel: create a fastpath GRO lookup. 2025-04-08 18:19:41 -07:00
udp.c net: track pfmemalloc drops via SKB_DROP_REASON_PFMEMALLOC 2025-07-18 16:59:05 -07:00
udplite.c udp: move udp_memory_allocated into net_aligned_data 2025-07-02 14:22:02 -07:00
xfrm6_input.c xfrm: Set transport header to fix UDP GRO handling 2025-07-02 09:19:56 +02:00
xfrm6_output.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
xfrm6_policy.c xfrm: respect ip protocols rules criteria when performing dst lookups 2024-09-23 07:02:07 +02:00
xfrm6_protocol.c
xfrm6_state.c
xfrm6_tunnel.c xfrm: flush all states in xfrm_state_fini 2025-08-06 09:23:38 +02:00