linux.git/net/ipv4, branch v7.2-rc6

Merge tag 'net-7.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2026-07-30T16:18:49+00:00

Pull networking fixes from Paolo Abeni:
 "This is again larger than usual: the backlog accumulated in the past weeks
  is not done yet. I'm not aware of any known pending regression.

  Including fixes from netfilter, Bluetooth, WiFi and CAN.

  Current release - regressions:

   - bluetooth: remove unnecessary hci_conn_get in create_conn_sync

   - can: isotp: fix timer drain order, wakeup handling and tx_gen
     ordering

   - eth:
       - tun/vhost: revert avoid ptr_ring tail-drop when a qdisc is
         present

  Previous releases - regressions:

   - core: do not send ICMP/NDISC Redirects when peer allocation fails

   - ipv6: take nexthop lock for f6i_list walks in replace check and
     notify

   - wifi: fix an ath12k MLO regression impacting WCN7850/QCC2072.

   - netfilter: nf_tables: make nft_object rhltable per table

   - af_unix: fix listen() succeeding on sockets in the wrong state

   - openvswitch: fix potential UAF on meter attach failure

   - bluetooth:
       - fix advertising data UAFs
       - avoid deadlocks in iso_sock_timeout

   - smc: fix socket use-after-free during link group termination

   - dpll: use pin owner's dpll ref for pin-level attribute reporting

   - eth:
       - veth: convert frag_list skbs before running XDP
       - ice: wait for reset completion in ice_resume()
       - igc: remove napi_synchronize() in igc_down()
       - vxlan: use pskb_network_may_pull() for transmit path header pulls

  Previous releases - always broken:

   - xsk: fix AF_XDP multi-buffer Tx descriptor reclaim

   - psp: fix NULL genl_sock deref race with concurrent netns teardown

   - netfilter: widen NAT rewrite delta to s32 in sip_help_tcp()

   - can: peak_usb: fix double free of transfer buffer on URB submit error

   - dibs: fix use-after-free of dmb_node in loopback attach/detach/unregister

   - sctp: prevent peer transport count overflow

   - dsa: mt7530: error out on failed reads in MT7531 PHY polling

   - eth:
       - idpf: bound interrupt-vector register fill to the allocated array"

* tag 'net-7.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (156 commits)
  qede: sync udp_tunnel ports outside qede_lock in the recovery path
  net: openvswitch: fix potential UAF on meter attach failure
  octeontx2-pf: Set correct sequence for carrier off and tx queue stop
  net: libwx: fix FDIR ATR queue mismatch for software VLAN packets
  net: dsa: realtek: use devm_mutex_init for l2_lock
  net: dsa: realtek: use devm_mutex_init for vlan_lock
  net: dsa: realtek: use devm_mutex_init for regmap lock
  net: dsa: realtek: rtl8365mb: use devm_mutex_init for mib_lock
  ptp: netc: fix potential interrupt storm caused by incorrect unbind order
  net: mana: Return error code from mana_create_rxq()
  net: openvswitch: fix skb leak on flow key update failure during ct
  net: openvswitch: fix skb leak on flow key update failure during recirculation
  net: stmmac: Fix E2E delay mechanism
  net: dsa: mt7530: error out on failed reads in MT7531 PHY polling
  net: dsa: mt7530: error out on failed reads in ATC/VTCR command polling
  net: dsa: mt7530: check bus->read() errors in the MDIO regmap backend
  Revert "tun/tap: add ptr_ring consume helper with netdev queue wakeup"
  Revert "vhost-net: wake queue of tun/tap after ptr_ring consume"
  Revert "ptr_ring: move free-space check into separate helper"
  Revert "tun/tap & vhost-net: avoid ptr_ring tail-drop when a qdisc is present"
  ...

net: udp_tunnel: fix memory leak in udp_tunnel_nic_unregister()

2026-07-28T11:32:34+00:00

syzbot reported a memory leak [1] in the UDP tunnel NIC offload code.

When device registration fails (e.g. in register_netdevice()), netdev core
unwinds by sending a single NETDEV_UNREGISTER notification. If work was queued
during NETDEV_REGISTER (utn->work_pending is set), udp_tunnel_nic_unregister()
returns early:

	if (utn->work_pending)
		return;

Because failed registrations do not enter netdev_wait_allrefs_any(), no
subsequent NETDEV_UNREGISTER rebroadcast will ever occur. As a result, the
struct udp_tunnel_nic allocated in udp_tunnel_nic_alloc() is leaked
permanently.

Fix this by removing the early return. Instead, synchronously cancel any
pending work with cancel_delayed_work_sync() before freeing @utn.

To be able to call cancel_delayed_work_sync() while holding RTNL (the work also
needs RTNL), switch udp_tunnel_nic_device_sync_work() to rtnl_trylock(). If RTNL
is contended, requeue the work with a 1 jiffy delay (via queue_delayed_work())
to prevent high CPU contention while waiting for RTNL lock.

The utn->work_pending bookkeeping is no longer needed and is removed, as
the workqueue core already tracks the pending/running state of the work.

[1]
BUG: memory leak
unreferenced object 0xffff888127d5f840 (size 96):
  comm "syz-executor", pid 5806, jiffies 4294942188
  backtrace (crc 99fdb6c8):
    __kmalloc_noprof+0x3bf/0x550
    udp_tunnel_nic_alloc net/ipv4/udp_tunnel_nic.c:756 [inline]
    udp_tunnel_nic_register net/ipv4/udp_tunnel_nic.c:833 [inline]
    udp_tunnel_nic_netdevice_event+0x804/0xab0 net/ipv4/udp_tunnel_nic.c:931
    notifier_call_chain+0x59/0x160 kernel/notifier.c:85
    call_netdevice_notifiers_info+0x7d/0xb0 net/core/dev.c:2250
    register_netdevice+0xc10/0xeb0 net/core/dev.c:11478

Fixes: cc4e3835eff4 ("udp_tunnel: add central NIC RX port offload infrastructure")
Reported-by: syzbot+eca845fb8c18dd6b44c1@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/netdev/6a632b15.dde6c935.cf6c8.0011.GAE@google.com/T/#u
Signed-off-by: Eric Dumazet 
Link: https://patch.msgid.link/20260724091137.1792543-1-edumazet@google.com
Signed-off-by: Paolo Abeni

fou: Fix use-after-free in fou_create()

2026-07-28T08:40:48+00:00

fou_create() publishes struct fou through sk_user_data before adding the
new FOU port to the per-netns list.  If fou_add_to_port_list() fails,
the error path frees fou while it is still reachable through
sk_user_data.  A concurrent receive can then dereference the freed
object in fou_from_sock().

This ordering issue was previously noted in the linked discussion.

The failure is reachable when local port 0 is requested.  Each socket
binds to a different ephemeral port, but fou_cfg_cmp() compares the
requested port 0 and reports -EALREADY once an entry already exists.

Release the tunnel socket before freeing fou so sk_user_data is cleared
first, and defer reclamation with kfree_rcu() to protect concurrent RCU
readers.  This matches the lifetime handling in fou_release().

Fixes: 23461551c006 ("fou: Support for foo-over-udp RX path")
Suggested-by: Kuniyuki Iwashima 
Link: https://lore.kernel.org/netdev/20260502031401.3557229-12-kuniyu@google.com/
Cc: stable@vger.kernel.org
Signed-off-by: Xuanqiang Luo 
Link: https://patch.msgid.link/20260722083858.182506-1-xuanqiang.luo@linux.dev
Signed-off-by: Paolo Abeni

net: do not send ICMP/NDISC Redirects when peer allocation fails

2026-07-27T20:54:16+00:00

When inet_getpeer_v4() or inet_getpeer_v6() fails to allocate a peer entry
under memory pressure or tree size caps, redirect handlers previously fell
back to sending un-rate-limited ICMP/NDISC Redirect messages.

In IPv4, ip_rt_send_redirect() called icmp_send() directly when peer == NULL.
In IPv6, ip6_forward() and ndisc_send_redirect() passed a NULL peer into
inet_peer_xrlim_allow(), which returned true when peer == NULL.

Because ICMP/NDISC Redirects are not part of the default global rate limit
mask (sysctl_icmp_ratemask), sending redirects when peer == NULL creates
an un-rate-limited ICMP packet storm.

Fix this by failing closed in ip_rt_send_redirect(), ip6_forward(), and
ndisc_send_redirect() when peer is NULL.

Fixes: 92d868292634 ("inetpeer: Move ICMP rate limiting state into inet_peer entries.")
Signed-off-by: Eric Dumazet 
Reviewed-by: Ido Schimmel 
Link: https://patch.msgid.link/20260724072901.1633601-1-edumazet@google.com
Signed-off-by: Jakub Kicinski

Merge tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

2026-07-25T02:31:12+00:00

Pull bpf fixes from Eduard Zingerman:

 - Fix tcp_bpf_sendmsg() error path mistaking a concurrently-freed
   sk_psock->cork for the local temporary message and freeing it again
   (Chengfeng Ye)

 - Reject passing scalar NULL to nonnull arg of a global subprog.

   Previously the verifier did not account for the cases directly
   passing scalars to a global subprog, e.g.: 'global_func(0);' would
   pass even if 'global_func' argument was marked nonnull (Amery Hung)

* tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf:
  bpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()
  selftests/bpf: Test passing scalar NULL to nonnull global subprog
  bpf: Reject passing scalar NULL to nonnull arg of a global subprog

Merge tag 'nf-26-07-23' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf

2026-07-25T00:10:54+00:00

Pablo Neira Ayuso says:

====================
Netfilter/IPVS fixes for net

The following batch contains Netfilter/IPVS fixes for net. This batch
includes a mix of IPVS follow ups related to Sashiko reports, as well as
crash fixes for connection tracking expectation, helpers, ipset and
nf_tables mostly for old bugs. This also includes a fix for the
flowtable tunnel selftest.

1) Use s32 instead of s16 to calculate the remaining payload containing
   SIP messages, otherwise underflow is possible allowing out-of-bound
   memory access beyond the skb->data area. From Xiang Mei.

2) Fix the counter check in the flowtable selftest for tunnels, from
   Lorenzo Bianconi.

3) Add and use nf_ct_expect_related_pair() to add the RTP and RTCP
   expectations under the expectation lock, this is required by the SIP
   and H.323 NAT helpers. This fixes a possible reinsertion of an
   expectation with the DEAD flag set on while looping to find
   consecutive ports.

4) Fix ipset UaF during table resize by blocking comment updates on
   kernel-side adds. From David Lee.

5) Do not propagate the IP_VS_CONN_F_ONE_PACKET flag when using IPVS
   state synchronization, otherwise reaching stale freed from
   ip_vs_conn struct is possible, Zhiling Zou.

6) Adjust the hn1 hash node when the forwarding method changes between
   MASQ and non-MASQ for an already hashed connection.  This can leave
   stale hash nodes pointing to a freed struct ip_vs_conn and trigger
   UaF while reading /proc/net/ip_vs_conn. From Julian Anastasov.

7) nft_object rhltable needs to be per table, just like chain rhltable,
   otherwise UaF from object lookup path while netns is being released.
   There is also the nlevent path that can reach stale objects. Placing
   this rhltable under the table hierarchy fixes this issue.

8) Reject invalid combined usage of hashlimit tables with and without
   XT_HASHLIMIT_RATE_MATCH flag mode, otherwise access to uninitialized
   .burst field of dsthash_ent is possible.

9) Fix checksum validations in IPVS performed from LOCAL_IN,
   from Julian Anastasov.

10) Fix incorrect packet offset to layer 4 protocol in IPVS, uncovered
    by Sashiko, from Julian Anastasov.

11) Skip the mangling of ICMP replies for non-first fragments, also
    reported by Sashiko. Also from Julian.

12) Clear ip_vs_conn flags under the spinlock to fix a possible data
    race. From Julian Anastasov.

13) Fix incorrect calculation of the payload bitmask in the nf_tables
    hardware offload support, leading to UBSAN splat. From Xiang Mei.

* tag 'nf-26-07-23' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf:
  netfilter: nft_payload: fix mask build for partial field offload
  ipvs: clear the nfct flag under lock
  ipvs: do not mangle ICMP replies for non-first fragments
  ipvs: fix places with wrong packet offsets
  ipvs: fix the checksum validations
  netfilter: xt_hashlimit: validate hashtable supports XT_HASHLIMIT_RATE_MATCH
  netfilter: nf_tables: make nft_object rhltable per table
  ipvs: adjust double hashing when fwd method changes
  ipvs: do not propagate one-packet flag to synced conns
  netfilter: ipset: do not update comments from kernel-side hash adds
  netfilter: nf_conntrack_expect: add and use nf_ct_expect_related_pair()
  selftests: netfilter: nft_flowtable.sh: fix offload counter verification for tunnel tests
  netfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp()
====================

Link: https://patch.msgid.link/20260723163910.274695-1-pablo@netfilter.org
Signed-off-by: Jakub Kicinski

bpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()

2026-07-24T22:04:11+00:00

tcp_bpf_sendmsg() keeps msg_tx across sk_stream_wait_memory(), which
drops and reacquires the socket lock.  Its error path tries to decide
whether msg_tx names the local temporary message by comparing it with
the current value of psock->cork.

This comparison is unsafe when two threads send on the same socket:

  Thread A                         Thread B
  msg_tx = psock->cork
  sk_msg_alloc() fails
  sk_stream_wait_memory()
    releases the socket lock      acquires the socket lock
                                  completes the cork
                                  psock->cork = NULL
                                  frees the cork
    reacquires the socket lock
  msg_tx != psock->cork
  sk_msg_free(msg_tx)

The stale cork is therefore mistaken for the local temporary message
and freed again.  KASAN reported:

  BUG: KASAN: slab-use-after-free in sk_msg_free+0x49/0x50
  Read of size 4 at addr ffff88810c908800 by task poc/90
  Call Trace:
   sk_msg_free+0x49/0x50
   tcp_bpf_sendmsg+0x14f5/0x1cc0
   __sys_sendto+0x32c/0x3a0
   __x64_sys_sendto+0xdb/0x1b0
  Allocated by task 89:
   __kasan_kmalloc+0x8f/0xa0
   tcp_bpf_sendmsg+0x16b3/0x1cc0
  Freed by task 91:
   __kasan_slab_free+0x43/0x70
   kfree+0x131/0x3c0
   tcp_bpf_sendmsg+0xec3/0x1cc0

msg_tx can only name the stack-local tmp or the shared cork. Check for
tmp directly so a changed psock->cork cannot turn a shared message into
an apparent local one.

Fixes: 604326b41a6f ("bpf, sockmap: convert to generic sk_msg interface")
Signed-off-by: Chengfeng Ye 
Reviewed-by: Emil Tsalapatis 
Reviewed-by: Jakub Sitnicki 
Link: https://lore.kernel.org/bpf/87fr18lmzo.fsf%40cloudflare.com/
Link: https://lore.kernel.org/netdev/20260719161630.2901208-1-nicoyip.dev%40gmail.com/ [v1]
Link: https://patch.msgid.link/20260724103856.3399001-1-nicoyip.dev@gmail.com
Signed-off-by: Eduard Zingerman

nexthop: avoid unlocked f6i_list walk in nh_rt_cache_flush

2026-07-24T22:00:56+00:00

nh_rt_cache_flush() walks nh->f6i_list during an RTNL-serialized nexthop
replace without holding nh->lock, racing the unlocked IPv6 route
add/delete that mutate the list under nh->lock and free fib6_info
entries (nh_rt_cache_flush() is inlined into rtm_new_nexthop()):

  BUG: KASAN: slab-use-after-free in nh_rt_cache_flush (net/ipv4/nexthop.c:2243)
  Read of size 8 at addr ffff888012953e18 by task exploit/146
   nh_rt_cache_flush (net/ipv4/nexthop.c:2243)
   replace_nexthop (net/ipv4/nexthop.c:2610)
   rtm_new_nexthop (net/ipv4/nexthop.c:3323)
   rtnetlink_rcv_msg (net/core/rtnetlink.c:7076)

Unlike the other f6i_list walks, this one bumps each route's sernum via
fib6_update_sernum_upto_root(), which needs tb6_lock; taking nh->lock
around it would invert the established tb6_lock -> nh->lock order and
deadlock. As the only purpose is to invalidate cached dsts, bump the
IPv6 sernum for the whole netns with rt_genid_bump_ipv6() instead,
mirroring the rt_cache_flush() already done for IPv4 just above.

Fixes: 081efd18326e ("ipv6: Protect nh->f6i_list with spinlock and flag.")
Reported-by: AutonomousCodeSecurity@microsoft.com
Signed-off-by: Xiang Mei (Microsoft) 
Reviewed-by: Ido Schimmel 
Link: https://patch.msgid.link/20260722002951.2614721-2-xmei5@asu.edu
Signed-off-by: Jakub Kicinski

nexthop: take nh->lock for f6i_list walks in replace check and notify

2026-07-24T22:00:56+00:00

fib6_check_nh_list() and __nexthop_replace_notify() walk nh->f6i_list
during an RTNL-serialized nexthop replace without holding nh->lock. IPv6
RTM_NEWROUTE/RTM_DELROUTE run without RTNL and mutate that list under
nh->lock (fib6_add_rt2node_nh(), fib6_purge_rt()), so both walks race a
concurrent route delete that unlinks and frees a fib6_info:

  BUG: KASAN: slab-use-after-free in rt6_fill_node.isra.0 (net/ipv6/route.c:5799)
  Read of size 4 at addr ffff888014607e64 by task exploit/143
   rt6_fill_node.isra.0 (net/ipv6/route.c:5799)
   fib6_rt_update (net/ipv6/route.c:6412)
   __nexthop_replace_notify (net/ipv4/nexthop.c:2542)
   rtm_new_nexthop (net/ipv4/nexthop.c:2554)
   rtnetlink_rcv_msg (net/core/rtnetlink.c:7076)

  BUG: KASAN: slab-use-after-free in fib6_check_nh_list (net/ipv4/nexthop.c:1605)
  Read of size 8 at addr ffff888014a7d068 by task exploit/142
   fib6_check_nh_list (net/ipv4/nexthop.c:1605)
   rtm_new_nexthop (net/ipv4/nexthop.c:2575)
   rtnetlink_rcv_msg (net/core/rtnetlink.c:7076)

Both walks only read the entries and take no tb6_lock, so protect them
with nh->lock; fib6_rt_update() uses gfp_any(), which returns GFP_ATOMIC
under the lock.

Fixes: 081efd18326e ("ipv6: Protect nh->f6i_list with spinlock and flag.")
Reported-by: AutonomousCodeSecurity@microsoft.com
Signed-off-by: Xiang Mei (Microsoft) 
Reviewed-by: Ido Schimmel 
Link: https://patch.msgid.link/20260722002951.2614721-1-xmei5@asu.edu
Signed-off-by: Jakub Kicinski

Merge tag 'net-7.2-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2026-07-23T19:58:08+00:00

Pull networking fixes from Jakub Kicinski:
 "Lots of fixes, double the count even for the 'new normal'. Largely due
  to my time off followed by a networking conference which distracted
  most maintainers (less so the AI generators).

  Including fixes from Bluetooth and WiFi.

  Current release - regressions:

   - wifi: mt76: fix MAC address for non OF pcie cards

  Current release - new code bugs:

   - mptcp: fix BUILD_BUG_ON on legacy ARM config

   - wifi: cfg80211: guard optional PMSR nominal time

  Previous releases - regressions:

   - qrtr: ns: raise node count limit to 512, we arbitrarily picked
     256 as a limit, turns out it was too low for real world deployments

   - vhost-net: fix TX stall when vhost owns virtio-net header

   - eth: amd-xgbe: fix MAC_AUTO_SW handling in CL37 AN

   - wifi: ath12k: fix low MLO RX throughput on WCN7850

  Previous releases - always broken:

   - number of random AI fixes for SCTP, RDS and TIPC protocols

   - more AI-looking fixes for WiFi drivers

   - number of fixes for missing pointer reloading after skb pull

   - reject BPF redirect use from qdisc qevent block

   - tcp: initialize standalone TCP-AO response padding

   - vsock/virtio: collapse receive queue under memory pressure to avoid
     client OOMing the host with tiny messages

   - ipv4: icmp: fill flow parameters in icmp_route_lookup decoy lookup,
     make sure the ICMP response routing follows the routing policy

   - gro: fix double aggregation of flush-marked skbs

   - ovpn: fix various refcount bugs

   - tls: device: push pending open record on splice EOF

   - eth: mlx5:
      - use sender devcom for MPV master-up
      - fix MCIA register buffer overflow on 32 dword reads"

* tag 'net-7.2-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (234 commits)
  drop_monitor: perform u64_stats updates under IRQ-disabled section
  drop_monitor: fix size calculations for 64-bit attributes
  net: drop_monitor: fix info leak in NET_DM_ATTR_PAYLOAD
  mptcp: fix BUILD_BUG_ON on legacy ARM config
  selftests: mptcp: userspace_pm: fix undefined variable port
  mptcp: fix stale skb->sk reference on subflow close
  mptcp: pm: userspace: fix use-after-free in get_local_id
  mptcp: decrement subflows counter on failed passive join
  mac802154: hold an interface reference across the scan worker
  sctp: don't free the ASCONF's own transport in DEL-IP processing
  phonet: check register_netdevice_notifier() error in phonet_device_init()
  phonet: pep: fix use-after-free in pep_get_sb()
  bnge/bng_re: fix ring ID widths
  tipc: fix integer overflow in tipc_recvmsg() and tipc_recvstream()
  net: airoha: fix ETS channel derivation in airoha_tc_setup_qdisc_ets()
  mctp: check register_netdevice_notifier() error in mctp_device_init()
  ptp: netc: explicitly clear TMR_OFF during initialization
  rds: tcp: unregister sysctl before tearing down listen socket
  ipv6: Change allocation flags to match rcu_read_lock section requirements
  net: slip: serialize receive against buffer reallocation
  ...