Merge tag 'net-6.0-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Pull networking fixes from Jakub Kicinski:
 "Including fixes from wifi, netfilter and can.

  A handful of awaited fixes here - revert of the FEC changes, bluetooth
  fix, fixes for iwlwifi spew.

  We added a warning in PHY/MDIO code which is triggering on a couple of
  platforms in a false-positive-ish way. If we can't iron that out over
  the week we'll drop it and re-add for 6.1.

  I've added a new "follow up fixes" section for fixes to fixes in
  6.0-rcs but it may actually give the false impression that those are
  problematic or that more testing time would have caught them. So
  likely a one time thing.

  Follow up fixes:

   - nf_tables_addchain: fix nft_counters_enabled underflow

   - ebtables: fix memory leak when blob is malformed

   - nf_ct_ftp: fix deadlock when nat rewrite is needed

  Current release - regressions:

   - Revert "fec: Restart PPS after link state change" and the related
     "net: fec: Use a spinlock to guard `fep->ptp_clk_on`"

   - Bluetooth: fix HCIGETDEVINFO regression

   - wifi: mt76: fix 5 GHz connection regression on mt76x0/mt76x2

   - mptcp: fix fwd memory accounting on coalesce

   - rwlock removal fall out:
      - ipmr: always call ip{,6}_mr_forward() from RCU read-side
        critical section
      - ipv6: fix crash when IPv6 is administratively disabled

   - tcp: read multiple skbs in tcp_read_skb()

   - mdio_bus_phy_resume state warning fallout:
      - eth: ravb: fix PHY state warning splat during system resume
      - eth: sh_eth: fix PHY state warning splat during system resume

  Current release - new code bugs:

   - wifi: iwlwifi: don't spam logs with NSS>2 messages

   - eth: mtk_eth_soc: enable XDP support just for MT7986 SoC

  Previous releases - regressions:

   - bonding: fix NULL deref in bond_rr_gen_slave_id

   - wifi: iwlwifi: mark IWLMEI as broken

  Previous releases - always broken:

   - nf_conntrack helpers:
      - irc: tighten matching on DCC message
      - sip: fix ct_sip_walk_headers
      - osf: fix possible bogus match in nf_osf_find()

   - ipvlan: fix out-of-bound bugs caused by unset skb->mac_header

   - core: fix flow symmetric hash

   - bonding, team: unsync device addresses on ndo_stop

   - phy: micrel: fix shared interrupt on LAN8814"

* tag 'net-6.0-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (83 commits)
  selftests: forwarding: add shebang for sch_red.sh
  bnxt: prevent skb UAF after handing over to PTP worker
  net: marvell: Fix refcounting bugs in prestera_port_sfp_bind()
  net: sched: fix possible refcount leak in tc_new_tfilter()
  net: sunhme: Fix packet reception for len < RX_COPY_THRESHOLD
  udp: Use WARN_ON_ONCE() in udp_read_skb()
  selftests: bonding: cause oops in bond_rr_gen_slave_id
  bonding: fix NULL deref in bond_rr_gen_slave_id
  net: phy: micrel: fix shared interrupt on LAN8814
  net/smc: Stop the CLC flow if no link to map buffers on
  ice: Fix ice_xdp_xmit() when XDP TX queue number is not sufficient
  net: atlantic: fix potential memory leak in aq_ndev_close()
  can: gs_usb: gs_usb_set_phys_id(): return with error if identify is not supported
  can: gs_usb: gs_can_open(): fix race dev->can.state condition
  can: flexcan: flexcan_mailbox_read() fix return value for drop = true
  net: sh_eth: Fix PHY state warning splat during system resume
  net: ravb: Fix PHY state warning splat during system resume
  netfilter: nf_ct_ftp: fix deadlock when nat rewrite is needed
  netfilter: ebtables: fix memory leak when blob is malformed
  netfilter: nf_tables: fix percpu memory leak at nf_tables_addchain()
  ...

1 files changed, 7 insertions, 1 deletions

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index d398f3810662..969b33a9dd64 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -150,9 +150,15 @@ static bool mptcp_try_coalesce(struct sock *sk, struct sk_buff *to,
 		 MPTCP_SKB_CB(from)->map_seq, MPTCP_SKB_CB(to)->map_seq,
 		 to->len, MPTCP_SKB_CB(from)->end_seq);
 	MPTCP_SKB_CB(to)->end_seq = MPTCP_SKB_CB(from)->end_seq;
-	kfree_skb_partial(from, fragstolen);
+
+	/* note the fwd memory can reach a negative value after accounting
+	 * for the delta, but the later skb free will restore a non
+	 * negative one
+	 */
 	atomic_add(delta, &sk->sk_rmem_alloc);
 	mptcp_rmem_charge(sk, delta);
+	kfree_skb_partial(from, fragstolen);
+
 	return true;
 }