ip: Fix data-races around sysctl_ip_prot_sock.

[platform/kernel/linux-starfive.git] / net / ipv4 / sysctl_net_ipv4.c

diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 130e9c1..5490c28 100644 (file)
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -84,7 +84,7 @@ static int ipv4_local_port_range(struct ctl_table *table, int write,
                 * port limit.
                 */
                if ((range[1] < range[0]) ||
-                   (range[0] < net->ipv4.sysctl_ip_prot_sock))
+                   (range[0] < READ_ONCE(net->ipv4.sysctl_ip_prot_sock)))
                        ret = -EINVAL;
                else
                        set_local_port_range(net, range);
@@ -110,7 +110,7 @@ static int ipv4_privileged_ports(struct ctl_table *table, int write,
                .extra2 = &ip_privileged_port_max,
        };
 
-       pports = net->ipv4.sysctl_ip_prot_sock;
+       pports = READ_ONCE(net->ipv4.sysctl_ip_prot_sock);
 
        ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 
@@ -122,7 +122,7 @@ static int ipv4_privileged_ports(struct ctl_table *table, int write,
                if (range[0] < pports)
                        ret = -EINVAL;
                else
-                       net->ipv4.sysctl_ip_prot_sock = pports;
+                       WRITE_ONCE(net->ipv4.sysctl_ip_prot_sock, pports);
        }
 
        return ret;