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tcp: Fix data-races around sysctl_tcp_migrate_req.
[ Upstream commit 4177f54 ] While reading sysctl_tcp_migrate_req, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers. Fixes: f9ac779 ("net: Introduce net.ipv4.tcp_migrate_req.") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
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