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Change History

In the Linux kernel, the following vulnerability has been resolved:

ipv6: mcast: remove one synchronize_net() barrier in ipv6_mc_down()

As discussed in the past (commit 2d3916f31891 ("ipv6: fix skb drops
in igmp6_event_query() and igmp6_event_report()")) I think the
synchronize_net() call in ipv6_mc_down() is not needed.

Under load, synchronize_net() can last between 200 usec and 5 ms.

KASAN seems to agree as well.

kernel.org https://git.kernel.org/stable/c/17ef8efc00b34918b966388b2af0993811895a8c [No types assigned]

kernel.org https://git.kernel.org/stable/c/26d4bac55750d535f1f0b8790dc26daf6089e373 [No types assigned]

kernel.org https://git.kernel.org/stable/c/5da9a218340a2bc804dc4327e5804392e24a0b88 [No types assigned]

kernel.org https://git.kernel.org/stable/c/7eb06ee5921189812e6b4bfe7b0f1e878be16df7 [No types assigned]

kernel.org https://git.kernel.org/stable/c/9d159d6637ccce25f879d662a480541ef4ba3a50 [No types assigned]

kernel.org https://git.kernel.org/stable/c/a03ede2282ebbd181bd6f5c38cbfcb5765afcd04 [No types assigned]