From: Kuniyuki Iwashima kuniyu@amazon.com
[ Upstream commit e59ef36f0795696ab229569c153936bfd068d21c ]
While reading sysctl_net_busy_read, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader.
Fixes: 2d48d67fa8cd ("net: poll/select low latency socket support") 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/core/sock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/core/sock.c b/net/core/sock.c index bbf9517218ff3..002c91dd7191f 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -2783,7 +2783,7 @@ void sock_init_data(struct socket *sock, struct sock *sk)
#ifdef CONFIG_NET_RX_BUSY_POLL sk->sk_napi_id = 0; - sk->sk_ll_usec = sysctl_net_busy_read; + sk->sk_ll_usec = READ_ONCE(sysctl_net_busy_read); #endif
sk->sk_max_pacing_rate = ~0U;