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net: Fix a data-race around sysctl_tstamp_allow_data.

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[ Upstream commit d2154b0afa ]

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>
This commit is contained in:
Kuniyuki Iwashima 2022-08-23 10:46:50 -07:00 committed by Greg Kroah-Hartman
parent ed48223f87
commit 8db070463e
1 changed files with 1 additions and 1 deletions
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2
net/core/skbuff.c
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@ -4691,7 +4691,7 @@ static bool skb_may_tx_timestamp(struct sock *sk, bool tsonly)
{ {
bool ret; bool ret;
if (likely(sysctl_tstamp_allow_data || tsonly)) if (likely(READ_ONCE(sysctl_tstamp_allow_data) || tsonly))
return true; return true;
read_lock_bh(&sk->sk_callback_lock); read_lock_bh(&sk->sk_callback_lock);