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75fa9caeb8
linux/net
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Eric Dumazet 75fa9caeb8 ipv6: mcast: fix delay calculation in igmp6_join_group() 
When joining a multicast group, if a report work is already pending
(e.g. scheduled by a query or a previous join), igmp6_join_group()
cancels the delayed work and recalculates the delay:

	if (cancel_delayed_work(&ma->mca_work)) {
		refcount_dec(&ma->mca_refcnt);
		delay = ma->mca_work.timer.expires - jiffies;
	}

Unlike igmp6_group_queried(), igmp6_join_group() did not check
if delay >= interval. This leads to two issues:

1. If the timer has already expired (timer.expires <= jiffies), the
   stale expiry is reused by mod_delayed_work(), causing the second
   unsolicited report to fire on the very next tick without a
   randomized delay.
2. If the timer was originally armed by a query with a large
   maximum response delay, delay could exceed
   unsolicited_report_interval(ma->idev).

Fix this by initializing delay to unsolicited_report_interval(ma->idev)
and re-randomizing it with get_random_u32_below(interval) when
delay >= interval, mirroring the logic in igmp6_group_queried().

Fixes: 2d9a93b490 ("mld: convert from timer to delayed work")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Taehee Yoo <ap420073@gmail.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Link: https://patch.msgid.link/20260828084531.1826790-4-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-08-31 17:54:46 -07:00
..
6lowpan net: Use helpers to get/set UDP len tree-wide 2026-07-22 13:47:02 +02:00
9p 9p: Add missing read barrier in virtio zero-copy path 2026-06-21 05:22:57 +00:00
802 appletalk: move the protocol out of tree 2026-06-16 14:37:06 -07:00
8021q vlan: fix skb_under_panic and races when toggling HW VLAN offload 2026-08-20 13:05:43 -07:00
atm Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-08-06 11:53:47 -07:00
batman-adv Here are a few batman-adv bugfixes: 2026-08-22 12:42:58 -07:00
bluetooth Bluetooth: L2CAP: clear FLAG_DEFER_SETUP only for same PID/PSM 2026-08-31 13:59:45 -04:00
bpf bpf: Fix partial copy of non-linear test_run output 2026-06-21 17:55:06 -07:00
bridge net: bridge: mcast: fix use-after-free of a master VLAN's multicast context 2026-08-27 12:35:03 -07:00
can can: isotp: check register_netdevice_notifier() error in module init 2026-07-29 11:26:41 +02:00
ceph for-7.3/block-20260819 2026-08-20 13:55:16 -07:00
core page_pool: keep frag_offset aligned for odd-sized requests 2026-08-31 16:24:51 -07:00
dcb
devlink devlink: add generic device max_sfs parameter 2026-08-11 18:06:30 -07:00
dns_resolver keys, dns: Drop unused NUL terminator from upayload->data 2026-08-10 16:20:42 -07:00
dsa net: dsa: initial MT7628 tagging driver 2026-08-18 15:50:13 +02:00
ethernet
ethtool ethtool: tsconfig: reject zero-valued tx_type and rx_filter bitsets 2026-08-13 17:44:54 -07:00
handshake handshake: Require admin permission for DONE command 2026-06-12 15:45:44 -07:00
hsr Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-08-18 10:42:41 -07:00
ieee802154 ieee802154: convert dgram getsockopt to sockopt_t 2026-08-03 16:55:23 -07:00
ife net/sched: act_ife: Only operate on Ethernet frames 2026-08-24 11:59:59 -07:00
ipv4 igmp: convert struct ip_sf_list to RCU 2026-08-31 17:22:03 -07:00
ipv6 ipv6: mcast: fix delay calculation in igmp6_join_group() 2026-08-31 17:54:46 -07:00
iucv net/iucv: fix the recvmsg window update 2026-08-31 15:51:22 -07:00
kcm net: kcm: Hold RCU read lock while running BPF parser 2026-08-17 13:43:58 -07:00
key ipsec-2026-06-22 2026-06-23 16:22:24 -07:00
l2tp net: l2tp: do not propagate multicast notification errors 2026-08-24 11:43:28 -07:00
l3mdev
lapb
llc llc: fix SAP refcount leak when creating incoming sockets 2026-07-17 13:17:46 +02:00
mac80211 Networking changes for 7.3. 2026-08-20 08:16:04 -07:00
mac802154 mac802154: fix netdev use-after-free in beacon worker 2026-08-05 17:12:50 -07:00
mctp net: mctp: hold a reference to the route device in mctp_route_lookup() 2026-08-20 12:27:40 -07:00
mpls Summary 2026-08-20 08:46:41 -07:00
mptcp tcp: use GFP_ATOMIC in tcp_send_active_reset() 2026-08-28 15:35:38 -07:00
ncsi net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length 2026-08-05 17:24:57 -07:00
netfilter netfilter: nf_tables: remove leftover set_update_list 2026-08-27 16:10:57 +02:00
netlabel Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-06-11 14:33:35 -07:00
netlink netlink: drop unneeded semicolon 2026-08-05 17:32:34 -07:00
nfc nfc: nci: free destination parameters when closing a connection 2026-08-11 18:10:04 +02:00
nsh
openvswitch openvswitch: only skb_tx_error() a packet we are about to drop 2026-08-25 09:36:47 +02:00
packet net/packet: defer vmalloc TX_RING free until skbs finish 2026-08-20 13:18:46 -07:00
phonet phonet: pep: convert getsockopt to sockopt_t 2026-08-03 16:55:23 -07:00
psample net: psample: fix info leak in PSAMPLE_ATTR_DATA 2026-06-17 16:35:50 -07:00
psp psp: use unrcu_pointer() for the cmpxchg() on netdev psp_dev 2026-08-17 11:06:14 -07:00
qrtr net: qrtr: ns: Raise lookup limit to 128 2026-08-06 08:10:44 -07:00
rds Including fixes from Bluetooth, IPSec and Netfilter. 2026-08-27 13:53:43 -07:00
rfkill Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
rxrpc rxrpc: fix io_thread race in rxrpc_wake_up_io_thread() 2026-07-21 11:52:29 +02:00
sched net/sched: cls_flower: validate mask pointer after nla_next() 2026-08-31 17:02:56 -07:00
sctp sctp: validate chunk length in the inqueue parser 2026-08-30 14:17:53 -07:00
shaper net: shaper: add a note that we expect cap dumps to be tiny 2026-06-11 12:55:23 +02:00
smc Including fixes from Bluetooth, IPSec and Netfilter. 2026-08-27 13:53:43 -07:00
strparser
sunrpc NFS client updates for Linux 7.3 2026-08-26 15:09:21 -07:00
switchdev
tipc tipc: protect node reset trace dump with node lock 2026-08-28 14:35:19 -07:00
tls tls: device: fix out-of-bounds write in tls_append_frag() 2026-08-25 10:04:02 +02:00
unix Networking changes for 7.3. 2026-08-20 08:16:04 -07:00
vmw_vsock vsock/vmci: validate packet source for connected sockets 2026-08-31 16:50:54 -07:00
wireless Quite a bunch more work, of note: 2026-08-06 12:39:11 -07:00
x25 net/x25: fix use-after-free of the socket by its timers 2026-07-30 18:46:45 -07:00
xdp xsk: honor XDP_TX_METADATA in zero-copy path 2026-08-24 11:12:00 -07:00
xfrm ipsec-2026-08-18 2026-08-20 11:38:14 -07:00
compat.c net: af_unix: useful handling of LSM denials on SCM_RIGHTS 2026-08-17 18:14:52 -07:00
devres.c
Kconfig appletalk: move the protocol out of tree 2026-06-16 14:37:06 -07:00
Kconfig.debug
Makefile appletalk: move the protocol out of tree 2026-06-16 14:37:06 -07:00
socket.c Major changes: 2026-08-20 07:36:20 -07:00
sysctl_net.c net: enforce net sysctl registration 2026-08-13 13:12:21 +02:00