tcf_pedit_act() computes the COW range for skb_ensure_writable()
once before the key loop using tcfp_off_max_hint, but the hint does
not account for the runtime header offset added by typed keys. This
can leave part of the write region un-COW'd.

Fix by moving skb_ensure_writable() inside the per-key loop where
the actual write offset is known, and add overflow checking on the
offset arithmetic. For negative offsets (e.g. Ethernet header edits
at ingress), use skb_cow() to COW the headroom instead. Guard
offset_valid() against INT_MIN, where negation is undefined.

Fixes: 8b796475fd78 ("net/sched: act_pedit: really ensure the skb is writable")
Reported-by: Yiming Qian <yimingqian591@gmail.com>
Reported-by: Keenan Dong <keenanat2000@gmail.com>
Reported-by: Han Guidong <2045gemini@gmail.com>
Reported-by: Zhang Cen <rollkingzzc@gmail.com>
Reviewed-by: Han Guidong <2045gemini@gmail.com>
Tested-by: Han Guidong <2045gemini@gmail.com>
Reviewed-by: Davide Caratti <dcaratti@redhat.com>
Tested-by: Davide Caratti <dcaratti@redhat.com>
Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com>
Tested-by: Toke Høiland-Jørgensen <toke@redhat.com>
Reviewed-by: Victor Nogueira <victor@mojatatu.com>
Tested-by: Victor Nogueira <victor@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Rajat Gupta <rajat.gupta@oss.qualcomm.com>
Link: https://patch.msgid.link/20260531123221.48732-1-jhs@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Luiz Augusto von Dentz says:

====================
bluetooth pull request for net:

 - hci_core: fix memory leak in error path of hci_alloc_dev()
 - hci_sync: reject oversized Broadcast Announcement prepend
 - MGMT: Fix backward compatibility with userspace
 - MGMT: validate advertising TLV before type checks
 - L2CAP: reject BR/EDR signaling packets over MTUsig
 - RFCOMM: validate skb length in MCC handlers
 - RFCOMM: hold listener socket in rfcomm_connect_ind()
 - ISO: Fix not releasing hdev reference on iso_conn_big_sync
 - ISO: Fix a use-after-free of the hci_conn pointer
 - ISO: Fix data-race on iso_pi fields in hci_get_route calls
 - SCO: Fix data-race on sco_pi fields in sco_connect
 - BNEP: reject short frames before parsing

* tag 'for-net-2026-06-03' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth:
  Bluetooth: MGMT: Fix backward compatibility with userspace
  Bluetooth: SCO: Fix data-race on sco_pi fields in sco_connect
  Bluetooth: ISO: Fix data-race on iso_pi fields in hci_get_route calls
  Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer
  Bluetooth: ISO: Fix not releasing hdev reference on iso_conn_big_sync
  Bluetooth: fix memory leak in error path of hci_alloc_dev()
  Bluetooth: bnep: reject short frames before parsing
  Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend
  Bluetooth: L2CAP: reject BR/EDR signaling packets over MTUsig
  Bluetooth: RFCOMM: validate skb length in MCC handlers
  Bluetooth: MGMT: validate advertising TLV before type checks
  Bluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind()
====================

Link: https://patch.msgid.link/20260603162714.342496-1-luiz.dentz@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

syzbot reported the following uninit splat:

  BUG: KMSAN: uninit-value in mptcp_write_data_fin net/mptcp/options.c:542 [inline]
  BUG: KMSAN: uninit-value in mptcp_established_options_dss net/mptcp/options.c:590 [inline]
  BUG: KMSAN: uninit-value in mptcp_established_options+0x112f/0x3530 net/mptcp/options.c:874
   mptcp_write_data_fin net/mptcp/options.c:542 [inline]
   mptcp_established_options_dss net/mptcp/options.c:590 [inline]
   mptcp_established_options+0x112f/0x3530 net/mptcp/options.c:874
   tcp_established_options+0x312/0xcc0 net/ipv4/tcp_output.c:1192
   __tcp_transmit_skb+0x5dc/0x5fe0 net/ipv4/tcp_output.c:1575
   __tcp_send_ack+0x967/0xad0 net/ipv4/tcp_output.c:4499
   tcp_send_ack+0x3d/0x60 net/ipv4/tcp_output.c:4505
   mptcp_subflow_shutdown+0x164/0x690 net/mptcp/protocol.c:3137
   mptcp_check_send_data_fin+0x31b/0x3d0 net/mptcp/protocol.c:3218
   __mptcp_wr_shutdown net/mptcp/protocol.c:3234 [inline]
   __mptcp_close+0x860/0x1360 net/mptcp/protocol.c:3313
   mptcp_close+0x42/0x260 net/mptcp/protocol.c:3367
   inet_release+0x1ee/0x2a0 net/ipv4/af_inet.c:442
   __sock_release net/socket.c:722 [inline]
   sock_close+0xd6/0x2f0 net/socket.c:1514
   __fput+0x60e/0x1010 fs/file_table.c:510
   ____fput+0x25/0x30 fs/file_table.c:538
   task_work_run+0x208/0x2b0 kernel/task_work.c:233
   resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
   __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
   exit_to_user_mode_loop+0x306/0x1b60 kernel/entry/common.c:98
   __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
   syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
   syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
   __do_fast_syscall_32+0x2c7/0x460 arch/x86/entry/syscall_32.c:310
   do_fast_syscall_32+0x37/0x80 arch/x86/entry/syscall_32.c:332
   do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370
   entry_SYSENTER_compat_after_hwframe+0x84/0x8e

  Local variable opts created at:
   __tcp_transmit_skb+0x4d/0x5fe0 net/ipv4/tcp_output.c:1536
   __tcp_send_ack+0x967/0xad0 net/ipv4/tcp_output.c:4499

The output path currently omits initializing the mptcp extension
`use_map` flag in a few corner cases.

Address the issue always zeroing all the extensions flags before
eventually initializing the individual bits. To that extent, introduce
and use a struct_group to avoid multiple bitwise operations.

Fixes: cfcceb7a39fc ("tcp: shrink per-packet memset in __tcp_transmit_skb()")
Cc: stable@vger.kernel.org
Reported-by: syzbot+ff020673c5e3d94d9478@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=ff020673c5e3d94d9478
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20260602-net-mptcp-misc-fixes-7-1-rc7-v2-10-856831229976@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/bluetooth/l2cap_core.c:l2cap_sig_channel() accepts BR/EDR
signaling packets up to the channel MTU and dispatches each command
without enforcing the signaling MTU (MTUsig). A Bluetooth BR/EDR peer
within radio range can send a fixed-channel CID 0x0001 packet that is
larger than MTUsig and contains many L2CAP_ECHO_REQ commands before
pairing. In a real-radio stock-kernel run, one 681-byte signaling
packet containing 168 zero-length ECHO_REQ commands made the target
transmit 168 ECHO_RSP frames over about 220 ms.

Impact: a Bluetooth BR/EDR peer within radio range, before pairing, can
force 168 ECHO_RSP frames from one 681-byte fixed-channel signaling
packet containing packed ECHO_REQ commands.

Define Linux's BR/EDR signaling MTU as the spec minimum of 48 bytes and
reject any larger signaling packet with one L2CAP_COMMAND_REJECT_RSP
carrying L2CAP_REJ_MTU_EXCEEDED before any command is dispatched.

The Bluetooth Core spec wording for MTUExceeded says the reject
identifier shall match the first request command in the packet, and
that packets containing only responses shall be silently discarded.
Linux intentionally deviates from that prescription: silently
discarding desynchronizes the peer because the remote stack never
learns its responses were dropped, and locating the first request
command requires walking command headers past MTUsig, i.e. processing
bytes from a packet we have already decided is too large to process.
We therefore always emit one reject and use the identifier from the
first command header, a single fixed-offset byte read.

The unrestricted BR/EDR signaling parser and ECHO_REQ response path both
trace to the initial git import; no later introducing commit is
available for a Fixes tag.

Cc: stable@vger.kernel.org
Suggested-by: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Link: https://lore.kernel.org/r/20260518002800.1361430-1-michael.bommarito@gmail.com
Link: https://lore.kernel.org/r/20260520135034.1060859-1-michael.bommarito@gmail.com
Link: https://lore.kernel.org/r/20260521000555.3712030-1-michael.bommarito@gmail.com
Assisted-by: Claude:claude-opus-4-7
Assisted-by: Codex:gpt-5-5-xhigh
Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

Pablo Neira Ayuso says:

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

The following patchset contains Netfilter/IPVS fixes for net:

1) Fix splat with PREEMPT_RCU because smp_processor_id() in nfqueue,
   from Fernando Fernandez Mancera.

2) Fix possible use of pointer to old IPVS scheduler after RCU grace
   period when editing service, from Julian Anastasov.

3) Fix possible forever RCU walk over rt->fib6_siblings in nft_fib6,
   if rt is unlinked mid-iteration, apparently same issue happens in
   the fib6 core. From Jiayuan Chen.

4) Add mutex to guard refcount in synproxy infrastructure, since
   concurrent hook {un}registration can happen.
   From Fernando Fernandez Mancera.

5) Bail out if IRC conntrack helper fails to parse a command, do not
   try parsing using other command handlers, from Florian Westphal.
   This fixes a possible out-of-bound read.

6) Possible use-after-free in nft_tunnel by releasing template dst
   after all references has been dropped, from Tristan Madani.

7) Ignore conntrack template in nft_ct, from Jiayuan Chen.

8) Missing skb_ensure_writable() in ebt_snat, Yiming Qian.

9) Remove multi-register byteorder support, this allows for kernel
   stack info leak, from Florian Westphal.

* tag 'nf-26-06-01' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf:
  netfilter: nft_byteorder: remove multi-register support
  netfilter: bridge: make ebt_snat ARP rewrite writable
  netfilter: nft_ct: bail out on template ct in get eval
  netfilter: nft_tunnel: fix use-after-free on object destroy
  netfilter: conntrack_irc: fix possible out-of-bounds read
  netfilter: synproxy: add mutex to guard hook reference counting
  netfilter: nft_fib_ipv6: bail out of sibling walk if rt got unlinked
  ipvs: clear the svc scheduler ptr early on edit
  netfilter: xt_NFQUEUE: prefer raw_smp_processor_id
====================

Link: https://patch.msgid.link/20260601115923.433946-1-pablo@netfilter.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

When NEWTFILTER and DELFILTER are run concurrently it is possible to create a
race with an associated action.

Let's illustrate with CPU0 running NEWTFILTER and CPU1 running DELFILTER:

 0: mutex_lock() <-- holds the idr lock
 0: rcu_read_lock()
 0: p = idr_find(idr, index) <-- action p is valid (RCU protects IDR)
 0: mutex_unlock() <-- releases the idr lock
 1: refcount_dec_and_mutex_lock() <-- refcnt 1->0, mutex held
 1: idr_remove(idr, index) <-- Action removed from IDR
 1: mutex_unlock() <-- mutex released allowing us to delete the action
 1: tcf_action_cleanup(p); kfree(p) <-- Kfrees p immediately, no deferral
 0: refcount_inc_not_zero(&p->tcfa_refcnt) <-- ouch, UAF p points to freed memory

This patch fixes the race condition between NEWTFILTER and DELFILTER by
adding struct rcu_head to tc_action used in the deferral and introducing a
call_rcu() in the delete path to defer the final kfree().

Note: this is a revert of commit d7fb60b9cafb ("net_sched: get rid of tcfa_rcu")
but also modernization/simplification to directly use kfree_rcu().

Let's illustrate the new restored code path:

 0: rcu_read_lock()
 1: refcount_dec_and_mutex_lock() <-- refcnt 1->0, mutex held
 1: idr_remove(idr, index)
 1: mutex_unlock()
 1: call_rcu(&p->tcfa_rcu, tcf_action_rcu_free) <-- defer kfree after grace period
 0: p = idr_find(idr, index)
 0: refcount_inc_not_zero(&p->tcfa_refcnt) <-- fails, refcnt already 0
 1: rcu_read_unlock() <-- release so freeing can run after grace period

After CPU1 calls idr_remove(), the object is no longer reachable through the IDR.
CPU0's subsequent idr_find() will return NULL, and even if it still held a
stale pointer, the immediate kfree() is now deferred until after the RCU grace
period, so no UAF can occur.

Fixes: d7fb60b9cafb ("net_sched: get rid of tcfa_rcu")
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Reported-by: Kyle Zeng <kylebot@openai.com>
Tested-by: Victor Nogueira <victor@mojatatu.com>
Tested-by: syzbot@syzkaller.appspotmail.com
Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Tested-by: Kyle Zeng <kylebot@openai.com>
Reviewed-by: Pedro Tammela <pctammela@mojatatu.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Victor Nogueira <victor@mojatatu.com>
Link: https://patch.msgid.link/20260531160812.68020-1-jhs@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

ip_vs_edit_service() while unbinding the old scheduler clears
the svc->scheduler ptr after the scheduler module initiates
RCU callbacks. This can cause packets to use the old
scheduler at the time when svc->sched_data is already freed
after RCU grace period.

Fix it by clearing the ptr early in ip_vs_unbind_scheduler(),
before the done_service method schedules any RCU callbacks.

Also, if the new scheduler fails to initialize when replacing
the old scheduler, try to restore the old scheduler while still
returning the error code.

Link: https://sashiko.dev/#/patchset/20260519015506.634185-1-rosenp%40gmail.com
Fixes: 05f00505a89a ("ipvs: fix crash if scheduler is changed")
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Steffen Klassert says:

====================
pull request (net): ipsec 2026-05-29

1) xfrm: route MIGRATE notifications to caller's netns
   Thread the caller's netns through km_migrate() so that
   MIGRATE notifications go to the issuing netns, fixing both the
   init_net listener leak and MOBIKE notifications inside
   non-init netns. From Maoyi Xie.

2) xfrm: ipcomp: Free destination pages on acomp errors
   Move the out_free_req label up so that allocated destination
   pages are released on decompression errors, not only on success.
   From Herbert Xu.

3) xfrm: Check for underflow in xfrm_state_mtu
   Reject configurations that cause xfrm_state_mtu() to underflow,
   preventing a negative TFCPAD value from becoming a memset size
   that triggers an out-of-bounds write of several terabytes.
   From David Ahern.

4) xfrm: ah: use skb_to_full_sk in async output callbacks
   Convert the possibly-incomplete skb->sk to a full socket pointer
   in async AH callbacks so that a request_sock or timewait_sock
   never reaches xfrm_output_resume() downstream consumers.
   From Michael Bommarito.

5) Add and revert: esp: fix page frag reference leak on skb_to_sgvec failure
   The patch does not fix te issue completely.

6) xfrm: esp: restore combined single-frag length gate
   Check the aligned post-trailer combined length against a page limit
   in the fast path, preventing skb_page_frag_refill() from falling
   back to a page too small for the destination scatterlist.
   From Jingguo Tan.

7) xfrm: iptfs: reset runtime state when cloning SAs
   Reinitialise the clone's mode_data runtime objects before
   publishing it, preventing queued skbs from being freed with
   list state copied from the original SA when migration fails.
   From Shaomin Chen.

8) xfrm: move policy_bydst RCU sync from per-netns .exit to .pre_exit
   Flush policy tables and drain the workqueue in a .pre_exit handler
   so that cleanup_net() pays one RCU grace period per batch instead
   of one per namespace, fixing stalls at high CLONE_NEWNET rates.
   From Usama Arif.

9) xfrm: input: hold netns during deferred transport reinjection
   Take a netns reference when queueing deferred transport reinjection
   work and drop it after the callback completes, keeping the skb->cb
   net pointer valid until the deferred work runs.
   From Zhengchuan Liang.

* tag 'ipsec-2026-05-29' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec:
  Revert "esp: fix page frag reference leak on skb_to_sgvec failure"
  xfrm: input: hold netns during deferred transport reinjection
  xfrm: move policy_bydst RCU sync from per-netns .exit to .pre_exit
  xfrm: iptfs: reset runtime state when cloning SAs
  xfrm: esp: restore combined single-frag length gate
  esp: fix page frag reference leak on skb_to_sgvec failure
  xfrm: ah: use skb_to_full_sk in async output callbacks
  xfrm: Check for underflow in xfrm_state_mtu
  xfrm: ipcomp: Free destination pages on acomp errors
  xfrm: route MIGRATE notifications to caller's netns
====================

Link: https://patch.msgid.link/20260529092648.3878973-1-steffen.klassert@secunet.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Pull networking fixes from Paolo Abeni:
 "This is again significantly bigger than the same point into the
  previous cycle, but at least smaller than last week.

  I'm not aware of any pending regression for the current cycle.

  Including fixes from netfilter.

  Current release - regressions:

    - netfilter: walk fib6_siblings under RCU

  Previous releases - regressions:

    - netlink: fix sending unassigned nsid after assigned one

    - bridge: fix sleep in atomic context in netlink path

    - sched: fix ethx:ingress -> ethy:egress -> ethx:ingress mirred loop

    - ipv4: fix net->ipv4.sysctl_local_reserved_ports UaF

    - eth: tun: free page on short-frame rejection in tun_xdp_one()

  Previous releases - always broken:

    - skbuff: fix missing zerocopy reference in pskb_carve helpers

    - handshake: drain pending requests at net namespace exit

    - ethtool:
       - rss: avoid modifying the RSS context response
       - module: avoid leaking a netdev ref on module flash errors
       - coalesce: cap profile updates at NET_DIM_PARAMS_NUM_PROFILES

    - netfilter: fix dst corruption in same register operation

    - nfc: hci: fix out-of-bounds read in HCP header parsing

    - ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()

    - eth:
       - vti: use ip6_tnl.net in vti6_changelink().
       - vxlan: do not reuse cached ip_hdr() value after
         skb_tunnel_check_pmtu()"

* tag 'net-7.1-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (94 commits)
  dpll: zl3073x: make frequency monitor a per-device attribute
  dpll: zl3073x: use __dpll_device_change_ntf() and remove change_work
  dpll: export __dpll_device_change_ntf() for use under dpll_lock
  net/handshake: Drain pending requests at net namespace exit
  net/handshake: Verify file-reference balance in submit paths
  net/handshake: Close the submit-side sock_hold race
  net/handshake: hand off the pinned file reference to accept_doit
  net/handshake: Take a long-lived file reference at submit
  net/handshake: Pass negative errno through handshake_complete()
  nvme-tcp: store negative errno in queue->tls_err
  net/handshake: Use spin_lock_bh for hn_lock
  net: skbuff: fix missing zerocopy reference in pskb_carve helpers
  net: hibmcge: move dma_rmb() after dma_sync_single_for_cpu() in RX path
  net: hibmcge: disable Relaxed Ordering to fix RX packet corruption
  selftests/tc-testing: Add netem test case exercising loops
  selftests/tc-testing: Add mirred test cases exercising loops
  net/sched: act_mirred: Fix return code in early mirred redirect error paths
  net/sched: act_mirred: Fix blockcast recursion bypass leading to stack overflow
  net/sched: Fix ethx:ingress -> ethy:egress -> ethx:ingress mirred loop
  net/sched: fix packet loop on netem when duplicate is on
  ...

Pull misc fixes from Andrew Morton:
 "13 hotfixes. 9 are for MM. 9 are cc:stable and the remaining 4 address
  post-7.1 issues or aren't considered suitable for backporting.

  All patches are singletons - please see the individual changelogs for
  details"

* tag 'mm-hotfixes-stable-2026-05-25-16-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  Revert "mm: introduce a new page type for page pool in page type"
  mm/vmalloc: do not trigger BUG() on BH disabled context
  MAINTAINERS, mailmap: change email for Eugen Hristev
  mm/migrate_device: fix pgtable leak in migrate_vma_insert_huge_pmd_page
  kernel/fork: validate exit_signal in kernel_clone()
  mm: memcontrol: propagate NMI slab stats to memcg vmstats
  mm/damon/sysfs-schemes: delete tried region in regions_rmdirs()
  mm/rmap: initialize nr_pages to 1 at loop start in try_to_unmap_one
  zram: fix use-after-free in zram_writeback_endio
  memfd: deny writeable mappings when implying SEAL_WRITE
  ipc: limit next_id allocation to the valid ID range
  Revert "mm/hugetlbfs: update hugetlbfs to use mmap_prepare"
  MAINTAINERS: .mailmap: update after GEHC spin-off