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tcp: Fix a data-race around sysctl_tcp_stdurg.

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[ Upstream commit 4e08ed41cb ]

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

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 2022-07-18 10:26:50 -07:00 committed by Greg Kroah-Hartman
parent daa8b5b869
commit 03bb3892f3
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_input.c
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@ -5492,7 +5492,7 @@ static void tcp_check_urg(struct sock *sk, const struct tcphdr *th)
struct tcp_sock *tp = tcp_sk(sk); struct tcp_sock *tp = tcp_sk(sk);
u32 ptr = ntohs(th->urg_ptr); u32 ptr = ntohs(th->urg_ptr);
if (ptr && !sock_net(sk)->ipv4.sysctl_tcp_stdurg) if (ptr && !READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_stdurg))
ptr--; ptr--;
ptr += ntohl(th->seq); ptr += ntohl(th->seq);