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tcp/dccp: Fix a data-race around sysctl_tcp_fwmark_accept.

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[ Upstream commit 1a0008f9df59451d0a17806c1ee1a19857032fa8 ]

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>
This commit is contained in:
Kuniyuki Iwashima
2022-07-13 13:51:58 -07:00
committed by Greg Kroah-Hartman
parent 0ee76fe01f
commit d4f65615db
1 changed files with 2 additions and 1 deletions
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3
include/net/inet_sock.h
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@@ -107,7 +107,8 @@ static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb) static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb)
{ {
if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept) if (!sk->sk_mark &&
READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept))
return skb->mark; return skb->mark;
return sk->sk_mark; return sk->sk_mark;