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tcp: Fix a data-race around sysctl_tcp_max_orphans.

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[ Upstream commit 47e6ab24e8c6e3ca10ceb5835413f401f90de4bf ]

While reading sysctl_tcp_max_orphans, it can be changed concurrently.
So, we need to add READ_ONCE() to avoid a data-race.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
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
2022-07-06 16:39:58 -07:00
committed by Greg Kroah-Hartman
parent 609ce7ff75
commit 6481a8a72a
1 changed files with 2 additions and 1 deletions
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3
net/ipv4/tcp.c
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@@ -2490,7 +2490,8 @@ static void tcp_orphan_update(struct timer_list *unused)
static bool tcp_too_many_orphans(int shift)
{
return READ_ONCE(tcp_orphan_cache) << shift > sysctl_tcp_max_orphans;
return READ_ONCE(tcp_orphan_cache) << shift >
READ_ONCE(sysctl_tcp_max_orphans);
}
bool tcp_check_oom(struct sock *sk, int shift)