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authorJ. Bruce Fields <bfields@redhat.com>2017-09-05 15:11:47 -0400
committerJ. Bruce Fields <bfields@redhat.com>2017-09-05 15:11:47 -0400
commit0828170f3d6a9d86d2cf5bcd00f1b1ff99f0c15e (patch)
tree30236ae805486596c7a53c388931f3626aa97e2b /net/sunrpc
parent7075a867ce5748007b299bd28f12754cd51719d4 (diff)
parenteebe53e87f97975ee58a21693e44797608bf679c (diff)
merge nfsd 4.13 bugfixes into nfsd for-4.14 branch
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/svcsock.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index b434f524d677..399fab5d1936 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -421,6 +421,9 @@ static void svc_data_ready(struct sock *sk)
dprintk("svc: socket %p(inet %p), busy=%d\n",
svsk, sk,
test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
+
+ /* Refer to svc_setup_socket() for details. */
+ rmb();
svsk->sk_odata(sk);
if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags))
svc_xprt_enqueue(&svsk->sk_xprt);
@@ -437,6 +440,9 @@ static void svc_write_space(struct sock *sk)
if (svsk) {
dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
+
+ /* Refer to svc_setup_socket() for details. */
+ rmb();
svsk->sk_owspace(sk);
svc_xprt_enqueue(&svsk->sk_xprt);
}
@@ -760,8 +766,12 @@ static void svc_tcp_listen_data_ready(struct sock *sk)
dprintk("svc: socket %p TCP (listen) state change %d\n",
sk, sk->sk_state);
- if (svsk)
+ if (svsk) {
+ /* Refer to svc_setup_socket() for details. */
+ rmb();
svsk->sk_odata(sk);
+ }
+
/*
* This callback may called twice when a new connection
* is established as a child socket inherits everything
@@ -794,6 +804,8 @@ static void svc_tcp_state_change(struct sock *sk)
if (!svsk)
printk("svc: socket %p: no user data\n", sk);
else {
+ /* Refer to svc_setup_socket() for details. */
+ rmb();
svsk->sk_ostate(sk);
if (sk->sk_state != TCP_ESTABLISHED) {
set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
@@ -1381,12 +1393,18 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
return ERR_PTR(err);
}
- inet->sk_user_data = svsk;
svsk->sk_sock = sock;
svsk->sk_sk = inet;
svsk->sk_ostate = inet->sk_state_change;
svsk->sk_odata = inet->sk_data_ready;
svsk->sk_owspace = inet->sk_write_space;
+ /*
+ * This barrier is necessary in order to prevent race condition
+ * with svc_data_ready(), svc_listen_data_ready() and others
+ * when calling callbacks above.
+ */
+ wmb();
+ inet->sk_user_data = svsk;
/* Initialize the socket */
if (sock->type == SOCK_DGRAM)