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| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-18 10:26:50 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-07-29 17:28:12 +0200 |
| commit | d79e98dab53a7c82112a75aa889844403f3fd25f (patch) | |
| tree | 9d9e1edac092ac10e9e9f030720c4448e423d1ce | |
| parent | d316488be1d9674af7dd0a8ae56f394496e42a30 (diff) | |
| download | linux-stable-d79e98dab53a7c82112a75aa889844403f3fd25f.tar.gz linux-stable-d79e98dab53a7c82112a75aa889844403f3fd25f.tar.bz2 linux-stable-d79e98dab53a7c82112a75aa889844403f3fd25f.zip | |
tcp: Fix a data-race around sysctl_tcp_stdurg.
[ Upstream commit 4e08ed41cb1194009fc1a916a59ce3ed4afd77cd ]
While reading sysctl_tcp_stdurg, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.
Fixes: 1da177e4c3f4 ("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>
| -rw-r--r-- | net/ipv4/tcp_input.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 61f93f51adbb..f200dd654e05 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -5576,7 +5576,7 @@ static void tcp_check_urg(struct sock *sk, const struct tcphdr *th) struct tcp_sock *tp = tcp_sk(sk); 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 += ntohl(th->seq); |