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tcp: Fix a data-race around sysctl_tcp_notsent_lowat.
[ Upstream commit55be873695
] While reading sysctl_tcp_notsent_lowat, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader. Fixes:c9bee3b7fd
("tcp: TCP_NOTSENT_LOWAT socket option") 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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1 changed files with 1 additions and 1 deletions
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@ -1882,7 +1882,7 @@ void __tcp_v4_send_check(struct sk_buff *skb, __be32 saddr, __be32 daddr);
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static inline u32 tcp_notsent_lowat(const struct tcp_sock *tp)
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{
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struct net *net = sock_net((struct sock *)tp);
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return tp->notsent_lowat ?: net->ipv4.sysctl_tcp_notsent_lowat;
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return tp->notsent_lowat ?: READ_ONCE(net->ipv4.sysctl_tcp_notsent_lowat);
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}
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static inline bool tcp_stream_memory_free(const struct sock *sk)
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