From: Kuniyuki Iwashima kuniyu@amazon.com
[ Upstream commit 3c9ba81d72047f2e81bb535d42856517b613aba7 ]
While reading sysctl_somaxconn, 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 --- net/socket.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/socket.c b/net/socket.c index c74cfe1ee1699..7bcd7053e61f2 100644 --- a/net/socket.c +++ b/net/socket.c @@ -1509,7 +1509,7 @@ SYSCALL_DEFINE2(listen, int, fd, int, backlog)
sock = sockfd_lookup_light(fd, &err, &fput_needed); if (sock) { - somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; + somaxconn = READ_ONCE(sock_net(sock->sk)->core.sysctl_somaxconn); if ((unsigned int)backlog > somaxconn) backlog = somaxconn;