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tcp: Fix a data-race around sysctl_tcp_min_tso_segs.

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[ Upstream commit e0bb4ab9df ]

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

Fixes: 95bd09eb27 ("tcp: TSO packets automatic sizing")
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
2022-07-20 09:50:22 -07:00
committed by Greg Kroah-Hartman
parent 5584fe9718
commit f47e7e5b49
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_output.c
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@@ -1984,7 +1984,7 @@ static u32 tcp_tso_segs(struct sock *sk, unsigned int mss_now)
min_tso = ca_ops->min_tso_segs ? min_tso = ca_ops->min_tso_segs ?
ca_ops->min_tso_segs(sk) : ca_ops->min_tso_segs(sk) :
sock_net(sk)->ipv4.sysctl_tcp_min_tso_segs; READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_min_tso_segs);
tso_segs = tcp_tso_autosize(sk, mss_now, min_tso); tso_segs = tcp_tso_autosize(sk, mss_now, min_tso);
return min_t(u32, tso_segs, sk->sk_gso_max_segs); return min_t(u32, tso_segs, sk->sk_gso_max_segs);