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H A Digmp.cdiff 6305d821e3b9b5379d348528e5b5faf316383bc2 Fri Jul 15 12:17:42 CDT 2022 Kuniyuki Iwashima <kuniyu@amazon.com> igmp: Fix a data-race around sysctl_igmp_max_memberships.

While reading sysctl_igmp_max_memberships, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>