macvtap: read vnet_hdr_size once

[linux-2.6-microblaze.git] / drivers / net / macvtap.c

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 4026185..c27011b 100644 (file)
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -681,7 +681,7 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
        size_t linear;
 
        if (q->flags & IFF_VNET_HDR) {
-               vnet_hdr_len = q->vnet_hdr_sz;
+               vnet_hdr_len = READ_ONCE(q->vnet_hdr_sz);
 
                err = -EINVAL;
                if (len < vnet_hdr_len)
@@ -820,7 +820,7 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
 
        if (q->flags & IFF_VNET_HDR) {
                struct virtio_net_hdr vnet_hdr;
-               vnet_hdr_len = q->vnet_hdr_sz;
+               vnet_hdr_len = READ_ONCE(q->vnet_hdr_sz);
                if (iov_iter_count(iter) < vnet_hdr_len)
                        return -EINVAL;