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net: Fix a data-race around sysctl_tstamp_allow_data.
[ Upstream commitd2154b0afa
] While reading sysctl_tstamp_allow_data, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader. Fixes:b245be1f4d
("net-timestamp: no-payload only sysctl") 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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@ -4892,7 +4892,7 @@ static bool skb_may_tx_timestamp(struct sock *sk, bool tsonly)
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{
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bool ret;
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if (likely(sysctl_tstamp_allow_data || tsonly))
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if (likely(READ_ONCE(sysctl_tstamp_allow_data) || tsonly))
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return true;
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read_lock_bh(&sk->sk_callback_lock);
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