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tcp/dccp: Fix a data-race around sysctl_tcp_fwmark_accept.
[ Upstream commit1a0008f9df
] While reading sysctl_tcp_fwmark_accept, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader. Fixes:84f39b08d7
("net: support marking accepting TCP sockets") 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 2 additions and 1 deletions
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@ -110,7 +110,8 @@ static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
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static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb)
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{
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if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept)
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if (!sk->sk_mark &&
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READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept))
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return skb->mark;
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return sk->sk_mark;
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