ipv6: mcast: annotate data-races around mca_flags

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/proc/net/igmp6 walks IPv6 multicast memberships under RCU and
prints mca_flags without holding idev->mc_lock. The multicast paths
update the field while holding idev->mc_lock.

Annotate this intentional lockless snapshot with READ_ONCE() and the
matching writers with WRITE_ONCE().

Signed-off-by: Yuyang Huang <sigefriedhyy@gmail.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260609081113.7613-2-sigefriedhyy@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Yuyang Huang 2026-06-09 17:11:12 +09:00 • committed by Jakub Kicinski

parent 8d8fb5b5f5

commit d0dc208808

1 changed files with 32 additions and 20 deletions

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net/ipv6/mcast.c

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