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-rw-r--r--net/netlink/af_netlink.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 24b7cf447bc5..ada47e59647a 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -594,7 +594,10 @@ static int netlink_insert(struct sock *sk, u32 portid)
/* We need to ensure that the socket is hashed and visible. */
smp_wmb();
- nlk_sk(sk)->bound = portid;
+ /* Paired with lockless reads from netlink_bind(),
+ * netlink_connect() and netlink_sendmsg().
+ */
+ WRITE_ONCE(nlk_sk(sk)->bound, portid);
err:
release_sock(sk);
@@ -1012,7 +1015,8 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr,
if (nlk->ngroups < BITS_PER_LONG)
groups &= (1UL << nlk->ngroups) - 1;
- bound = nlk->bound;
+ /* Paired with WRITE_ONCE() in netlink_insert() */
+ bound = READ_ONCE(nlk->bound);
if (bound) {
/* Ensure nlk->portid is up-to-date. */
smp_rmb();
@@ -1098,8 +1102,9 @@ static int netlink_connect(struct socket *sock, struct sockaddr *addr,
/* No need for barriers here as we return to user-space without
* using any of the bound attributes.
+ * Paired with WRITE_ONCE() in netlink_insert().
*/
- if (!nlk->bound)
+ if (!READ_ONCE(nlk->bound))
err = netlink_autobind(sock);
if (err == 0) {
@@ -1888,7 +1893,8 @@ static int netlink_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
dst_group = nlk->dst_group;
}
- if (!nlk->bound) {
+ /* Paired with WRITE_ONCE() in netlink_insert() */
+ if (!READ_ONCE(nlk->bound)) {
err = netlink_autobind(sock);
if (err)
goto out;