linux.git/net, branch v7.2

Merge tag 'ceph-for-7.2-rc8' of https://github.com/ceph/ceph-client

2026-08-14T17:18:06+00:00

Pull ceph fixes from Ilya Dryomov:
 "A handful of tiny fixes, with the main ones being a follow-up for
  CEPH_IOC_SET_LAYOUT{,_POLICY} ioctl permissions check that went into
  rc5 and a userspace compatibility fixup.  The rest mostly harden
  against malformed network input.  All marked for stable"

* tag 'ceph-for-7.2-rc8' of https://github.com/ceph/ceph-client:
  ceph: use the mount idmap for the owner checks in the SET_LAYOUT ioctls
  ceph: fix MDS random selection readiness predicate
  libceph: Avoid using invalid osd indices from primary_temp
  libceph: fix OOB read in decode_watchers() via missing bounds check
  libceph: fix multiple unsafe decodes in decode_locker()
  libceph: tolerate addrvecs with multiple entries of the same type

Merge tag 'net-7.2-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2026-08-13T15:37:26+00:00

Pull networking fixes from Paolo Abeni:
 "Including fixes from netfilter.

  There is a known WiFi/mt76 regression, waiting for a complete fix that
  should land soonish.

  Previous releases - regressions:

   - tcp: fix icsk_ack.ato bitfield overflow

   - af_unix: Unlink scc_entry in unix_del_edge()

   - ipv4: fix use-after-free in fib_nhc_update_mtu()

   - netfilter:
      - ipset: fix refcount race between list:set GC and swap
      - nf_tables_offload: suppress WARN_ON_ONCE for ENOMEM in abort
        path

   - sched: act_ct: fix sk_buff leak when the header checks reject a
     packet

   - sctp: clear new_transport when removing a peer

   - dibs: correct freeing of dmb_clientid_arr

   - ovpn: fix NULL dereference when killing missing key

   - eth:
      - veth: fix queue index used to wake the peer txq in veth_poll
      - ngbe: fix NULL pointer dereference in non-MSI-X interrupt
        enabling
      - gve: fix zero-length skb frag with header-split

  Previous releases - always broken:

   - core: fix skb length accounting after generic XDP frag adjustment

   - af_packet: don't send zero-byte data in tpacket_snd().

   - eth:
      - bnxt: avoid deadlock when canceling IRQ affinity notifier
      - ipvlan: inherit needed_headroom and needed_tailroom from
        phy_dev"

* tag 'net-7.2-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (55 commits)
  l2tp: fix tunnel and session refcount leak on seq_file release
  net/sched: cls_bpf: reject dev-bound programs bound to a different device
  sctp: fix use-after-free of cached ASCONF chunk
  net: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG
  sctp: clear new_transport when removing a peer
  net/dibs: Correct freeing of dmb_clientid_arr
  net/sched: cls_u32: skip hash tables in u32_bind_class()
  gve: fix NULL dereference due to missing ptp adjfine
  gve: fix zero-length skb frag with header-split
  net/sched: act_api: fix TOCTOU NULL deref on a->goto_chain
  af_packet: Don't send zero-byte data in tpacket_snd().
  tipc: read le->link under the node lock in tipc_node_link_down()
  selftests: tls: cover splice after a failed decrypt
  net/tls: Fail tls_sw_splice_read() after a failed async decrypt
  net: ngbe: fix NULL pointer dereference in non-MSI-X interrupt enabling
  net: tap: fix wrong transport_header when sending VLAN-tagged frame
  net: packet: fix wrong transport_header when sending VLAN-tagged frame
  vxlan: do not arm the ageing timer on a device that is down
  ipv4: fix use-after-free in fib_nhc_update_mtu()
  NTB: ntb_netdev: Preserve RX queue depth on allocation failure
  ...

l2tp: fix tunnel and session refcount leak on seq_file release

2026-08-13T09:49:31+00:00

In pppol2tp_proc_open() and l2tp_dfs_seq_open(), iteration state
(pd->tunnel and pd->session) is kept in seq_file private data to allow
iteration across multiple read() system calls.

However, if userspace closes /proc/net/pppol2tp or /sys/kernel/debug/l2tp/tunnels
before reading to end-of-file (EOF), any tunnel or session reference stored in
pd->tunnel / pd->session is left un-dropped when seq_file private data is freed.

Fix this by dropping any remaining pd->tunnel and pd->session references in
pppol2tp_proc_release() and l2tp_dfs_seq_release() when closing the file.

Fixes: 0e0c3fee3a59 ("l2tp: hold reference on tunnels printed in pppol2tp proc file")
Fixes: f726214d9b23 ("l2tp: hold reference on tunnels printed in l2tp/tunnels debugfs file")
Reported-by: syzbot+d6fa74e3f19d6ee01e3a@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/netdev/6a760f32.01d0871a.3a0d52.004f.GAE@google.com/T/#u
Assisted-by: Jetski:Gemini-3.1-Pro
Cc: James Chapman 
Cc: Guillaume Nault 
Signed-off-by: Eric Dumazet 
Link: https://patch.msgid.link/20260811144651.2733424-1-edumazet@google.com
Signed-off-by: Paolo Abeni

net/sched: cls_bpf: reject dev-bound programs bound to a different device

2026-08-13T09:08:39+00:00

cls_bpf_prog_from_efd() obtained a SCHED_CLS program via
bpf_prog_get_type_dev() but never verified that a device-bound (offloaded)
program's bound netdev matches the TC netdev the classifier is being
attached to. This let a program loaded with prog_ifindex for device A be
attached via cls_bpf + skip_sw to device B; deleting device A then
destroyed the program's offload state while it was still attached to
device B, triggering a netdevsim WARN (panic with panic_on_warn=1).

Mirror the XDP attach path (net/core/dev.c) and reject the attach with
-EINVAL when a dev-bound program's bound device does not match the
target device.

Fixes: 2b3486bc2d23 ("bpf: Introduce device-bound XDP programs")
Reported-by: vega@nebusec.ai
Tested-by: Victor Nogueira 
Signed-off-by: Jamal Hadi Salim 
Acked-by: Daniel Borkmann 
Link: https://patch.msgid.link/20260809094418.901607-1-jhs@mojatatu.com
Signed-off-by: Paolo Abeni

sctp: fix use-after-free of cached ASCONF chunk

2026-08-13T00:54:42+00:00

addip_last_asconf caches the outstanding outbound ASCONF chunk. The normal
ASCONF-ACK completion path releases the chunk and clears the pointer.

However, sctp_asconf_queue_teardown() releases the cached chunk without
clearing addip_last_asconf. During peer restart handling,
sctp_sf_do_dupcook_a() queues SCTP_CMD_PURGE_ASCONF_QUEUE, which invokes
sctp_asconf_queue_teardown() while the association remains alive and leaves
the pointer dangling.

A delayed authenticated ASCONF-ACK can then reach sctp_sf_do_asconf_ack(),
which accesses the stale chunk and passes it to sctp_process_asconf_ack(),
causing a use-after-free and a second release.

Clearing the pointer exposes a race with T4 expiry. Peer restart handling
queues the timer stop before the purge, but SCTP_CMD_TIMER_STOP uses
timer_delete(), which does not wait for a callback already running on
another CPU. Such a callback can reach sctp_sf_t4_timer_expire() after
the purge and dereference NULL.

Clear addip_last_asconf after releasing the cached chunk, and make
sctp_sf_t4_timer_expire() consume a stale T4 expiry if no outstanding
ASCONF remains.

Fixes: a000c01e60e4 ("sctp: stop pending timers and purge queues when peer restart asoc")
Cc: stable@vger.kernel.org
Suggested-by: Xin Long 
Signed-off-by: Yuxiang Yang 
Acked-by: Xin Long 
Link: https://patch.msgid.link/20260809043806.2768302-1-yangyx22@mails.tsinghua.edu.cn
Signed-off-by: Jakub Kicinski

sctp: clear new_transport when removing a peer

2026-08-13T00:21:37+00:00

sctp_process_asconf_param() stores a newly added peer transport in
asoc->new_transport. After all parameters in the ASCONF chunk have been
processed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the
new transport.

An authenticated ASCONF from a remote SCTP peer can add a transport and
remove it again with a wildcard DEL-IP parameter in the same chunk. The
wildcard deletion preserves the transport on which the ASCONF arrived, but
removes the newly added transport through
sctp_assoc_del_nonprimary_peers(). The removal does not clear
asoc->new_transport, leaving it pointing to the removed transport.

sctp_sf_do_asconf() then creates a HEARTBEAT whose chunk->transport points
to the removed transport without holding a transport reference. During
local address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on
control_chunk_list. After the transport is freed by RCU, a successful
ASCONF_ACK for the replacement address releases the queued HEARTBEAT and
sctp_outq_select_transport() reads the freed transport's state.

The issue was found during a static audit of SCTP objects. With an
authenticated peer, the reproducer triggered the same KASAN report in 2
of 2 unpatched runs on a KASAN-enabled netdev/main kernel:

  BUG: KASAN: slab-use-after-free in sctp_outq_select_transport
  Read of size 4 at addr ffff88800b9bd95c by task python3/197

  Call Trace:
   sctp_outq_select_transport+0x549/0x8b0 [sctp]
   sctp_outq_flush+0x306/0x2c60 [sctp]
   sctp_transport_immediate_rtx+0xaf/0x260 [sctp]
   sctp_process_asconf_ack+0xa48/0xf70 [sctp]

  Allocated by task 197:
   sctp_transport_new+0x68/0x650 [sctp]
   sctp_assoc_add_peer+0x258/0x12a0 [sctp]
   sctp_process_asconf+0x5e9/0x1090 [sctp]

  Last potentially related work creation:
   __call_rcu_common.constprop.0+0x77/0xb70
   sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp]
   sctp_process_asconf+0xd9c/0x1090 [sctp]

The first invalid access was a four-byte read of transport->state at
net/sctp/outqueue.c:833. The same reproducer completed the full
authenticated ASCONF and local-address replacement sequence with this
change without a KASAN report or oops.

Clear new_transport when its peer is removed, before it can be used to
create the HEARTBEAT.

Fixes: 6af29ccc223b ("sctp: Bundle HEAERTBEAT into ASCONF_ACK")
Cc: stable@vger.kernel.org
Signed-off-by: Qing Ming 
Acked-by: Xin Long 
Link: https://patch.msgid.link/20260811152803.5629-1-a0yami@mailbox.org
Signed-off-by: Jakub Kicinski

libceph: Avoid using invalid osd indices from primary_temp

2026-08-12T19:21:41+00:00

A corrupted osdmap received from a Ceph monitor or OSD may contain osd
indices in its pg_temp, primary_temp, pg_upmap, and pg_upmap_items parts
that don't exist, i.e., that are greater than max_osd or smaller than
CEPH_HOMELESS_OSD (-1). These indices are used to create the up and
acting set in ceph_pg_to_up_acting_osds(), called from calc_target().
While most of these osd indices are checked, the one from primary_temp
is not. Subsequently, this may lead to calc_target() returning this
(potentially invalid) index as target osd for a (linger) request.
Because the osd_state, osd_weight, and osd_addr arrays only contain
max_osd entries (with indices 0 to max_osd -1), this leads to
out-of-bounds accesses when trying to read values from these arrays.

This patch fixes the issue by adding a check to get_temp_osds(), so that
only valid osd indices from primary_temp are used, and it falls back to
using the primary from pg_temp or the up set if it is invalid.

[ idryomov: changelog ]

Cc: stable@vger.kernel.org
Fixes: 5e8d4d36bf23 ("libceph: add support for primary_temp mappings")
Signed-off-by: Raphael Zimmer 
Reviewed-by: Ilya Dryomov 
Signed-off-by: Ilya Dryomov

libceph: fix OOB read in decode_watchers() via missing bounds check

2026-08-12T19:21:41+00:00

ceph_start_decoding() validates that struct_len bytes remain in the
buffer after the encoding header, but accepts struct_len=0 as valid:
ceph_decode_need(p, end, 0, bad) always passes. When a malicious or
compromised OSD sends an obj_list_watch_response_t reply with
struct_len=0, ceph_start_decoding() returns success with p == end,
leaving zero bytes guaranteed for subsequent reads.

The immediately following ceph_decode_32(p) in decode_watchers() has
no preceding bounds check. With p == end this is a 4-byte read past
the validated buffer boundary. The garbage value is then passed
directly to kzalloc_objs() as the watcher count.

The sibling function decode_watcher() already uses the safe variants
(ceph_decode_copy_safe, ceph_decode_64_safe, ceph_decode_skip_32)
after its own ceph_start_decoding() call. decode_watchers() is the
only site that uses the bare variant, confirming an oversight.

Fix by replacing ceph_decode_32(p) with ceph_decode_32_safe(p, end,
*num_watchers, bad), consistent with the established pattern.

Attacker model: a malicious or compromised OSD in a multi-tenant Ceph
deployment (e.g. cloud) can trigger this against any kernel client
that calls CEPH_OSD_OP_LIST_WATCHERS, without any further privileges
beyond OSD session establishment.

[ idryomov: trim changelog ]

Cc: stable@vger.kernel.org
Fixes: a4ed38d7a180 ("libceph: support for CEPH_OSD_OP_LIST_WATCHERS")
Signed-off-by: Pavitra Jha 
Reviewed-by: Viacheslav Dubeyko 
Signed-off-by: Ilya Dryomov

libceph: fix multiple unsafe decodes in decode_locker()

2026-08-12T19:21:41+00:00

decode_locker() in cls_lock_client.c contains three unsafe decode
operations that allow a malicious or compromised OSD to trigger
slab-out-of-bounds reads:

1. ceph_decode_copy() at the locker_id_t name field has no preceding
   bounds check. With p == end after ceph_start_decoding() accepts
   struct_len=0, this reads sizeof(ceph_entity_name) = 9 bytes past
   the validated buffer boundary.

2. *p += sizeof(struct ceph_timespec) after the locker_info_t header
   is an unchecked pointer advance. A malicious OSD can position p
   past end, causing all subsequent _safe checks to pass against a
   bogus boundary.

3. len = ceph_decode_32(p) has no preceding bounds check, and the
   immediately following *p += len is uncapped. A malicious OSD can
   send len=0xffffffff, advancing p gigabytes past end and escaping
   the decode window entirely.

Fix all three by replacing bare operations with their safe variants:
  ceph_decode_copy   -> ceph_decode_copy_safe
  *p += sizeof(...)  -> ceph_decode_skip_n
  ceph_decode_32(p)  -> ceph_decode_32_safe
  *p += len          -> ceph_decode_skip_n

A new label is added to return -EINVAL on any bounds violation.
-EINVAL is appropriate here: the data received from the OSD
is structurally malformed, which is an invalid argument to the decode
contract regardless of whether the caller or the wire is at fault.

Attacker model: a malicious or compromised OSD in a multi-tenant Ceph
deployment can trigger this against any kernel client that issues the
lock.get_info class method (e.g. during RBD exclusive lock acquisition)
without any further privileges beyond OSD session establishment.

[ idryomov: use ceph_decode_skip_string() to skip description, trim
  changelog ]

Cc: stable@vger.kernel.org
Fixes: d4ed4a530562 ("libceph: support for lock.lock_info")
Signed-off-by: Pavitra Jha 
Reviewed-by: Ilya Dryomov 
Signed-off-by: Ilya Dryomov

libceph: tolerate addrvecs with multiple entries of the same type

2026-08-12T19:20:54+00:00

ceph_decode_entity_addrvec() rejects any addrvec containing more than
one entry that matches the requested msgr type (LEGACY or MSGR2),
logging "another match of type N in addrvec" and returning -EINVAL.

Some admin tooling (e.g. pveceph mon create from Proxmox VE) generates
addrvecs with multiple same-type entries when public_network lists more
than one CIDR: it picks one local IP per subnet and emits both a v2 and
a v1 entry for each IP.  Monmaps shaped this way cause:

  libceph: mon0 (1)10.10.10.15:6789 session established
  libceph: another match of type 1 in addrvec
  libceph: problem decoding monmap, -22

No Ceph code uses the extra entries: since Nautilus, the userspace
messenger (AsyncMessenger) unconditionally picks the first address of
the requested type and ignores any subsequent matches.

Match that behavior: use the first matching entry and silently skip any
subsequent ones.  This is a compatibility fix for existing deployments
and does not enable dual-stack or multi-subnet address selection.

[ idryomov: tweak ceph_decode_entity_addrvec() comment ]

Cc: stable@vger.kernel.org
Fixes: a5cbd5fc22d5 ("libceph, ceph: get and handle cluster maps with addrvecs")
Link: https://bugzilla.proxmox.com/show_bug.cgi?id=7518
Signed-off-by: Kefu Chai 
Reviewed-by: Ilya Dryomov 
Signed-off-by: Ilya Dryomov