Merge tag 'net-6.1-rc9' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

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

  Current release - new code bugs:

   - bonding: ipv6: correct address used in Neighbour Advertisement
     parsing (src vs dst typo)

   - fec: properly scope IRQ coalesce setup during link up to supported
     chips only

  Previous releases - regressions:

   - Bluetooth fixes for fake CSR clones (knockoffs):
       - re-add ERR_DATA_REPORTING quirk
       - fix crash when device is replugged

   - Bluetooth:
       - silence a user-triggerable dmesg error message
       - L2CAP: fix u8 overflow, oob access
       - correct vendor codec definition
       - fix support for Read Local Supported Codecs V2

   - ti: am65-cpsw: fix RGMII configuration at SPEED_10

   - mana: fix race on per-CQ variable NAPI work_done

  Previous releases - always broken:

   - af_unix: diag: fetch user_ns from in_skb in unix_diag_get_exact(),
     avoid null-deref

   - af_can: fix NULL pointer dereference in can_rcv_filter

   - can: slcan: fix UAF with a freed work

   - can: can327: flush TX_work on ldisc .close()

   - macsec: add missing attribute validation for offload

   - ipv6: avoid use-after-free in ip6_fragment()

   - nft_set_pipapo: actually validate intervals in fields after the
     first one

   - mvneta: prevent oob access in mvneta_config_rss()

   - ipv4: fix incorrect route flushing when table ID 0 is used, or when
     source address is deleted

   - phy: mxl-gpy: add workaround for IRQ bug on GPY215B and GPY215C"

* tag 'net-6.1-rc9' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (77 commits)
  net: dsa: sja1105: avoid out of bounds access in sja1105_init_l2_policing()
  s390/qeth: fix use-after-free in hsci
  macsec: add missing attribute validation for offload
  net: mvneta: Fix an out of bounds check
  net: thunderbolt: fix memory leak in tbnet_open()
  ipv6: avoid use-after-free in ip6_fragment()
  net: plip: don't call kfree_skb/dev_kfree_skb() under spin_lock_irq()
  net: phy: mxl-gpy: add MDINT workaround
  net: dsa: mv88e6xxx: accept phy-mode = "internal" for internal PHY ports
  xen/netback: don't call kfree_skb() under spin_lock_irqsave()
  dpaa2-switch: Fix memory leak in dpaa2_switch_acl_entry_add() and dpaa2_switch_acl_entry_remove()
  ethernet: aeroflex: fix potential skb leak in greth_init_rings()
  tipc: call tipc_lxc_xmit without holding node_read_lock
  can: esd_usb: Allow REC and TEC to return to zero
  can: can327: flush TX_work on ldisc .close()
  can: slcan: fix freed work crash
  can: af_can: fix NULL pointer dereference in can_rcv_filter
  net: dsa: sja1105: fix memory leak in sja1105_setup_devlink_regions()
  ipv4: Fix incorrect route flushing when table ID 0 is used
  ipv4: Fix incorrect route flushing when source address is deleted
  ...

1 files changed, 5 insertions, 0 deletions

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index e19507614f64..60fd91bb5171 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -920,6 +920,9 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 		if (err < 0)
 			goto fail;
 
+		/* We prevent @rt from being freed. */
+		rcu_read_lock();
+
 		for (;;) {
 			/* Prepare header of the next frame,
 			 * before previous one went down. */
@@ -943,6 +946,7 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 		if (err == 0) {
 			IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
 				      IPSTATS_MIB_FRAGOKS);
+			rcu_read_unlock();
 			return 0;
 		}
 
@@ -950,6 +954,7 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 
 		IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
 			      IPSTATS_MIB_FRAGFAILS);
+		rcu_read_unlock();
 		return err;
 
 slow_path_clean: