[Qemu-devel] [PATCH] virtio/vhost: do not take address of packed members

[Paolo Bonzini <pbonzini@redhat.com>]

The address of a packed member is not packed, which may cause accesses
to unaligned pointers.  Avoid this by reading the packed value before
passing it to another function.

Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/char/virtio-serial-bus.c | 6 +++---
 hw/virtio/vhost-user.c      | 7 +++++--
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/hw/char/virtio-serial-bus.c b/hw/char/virtio-serial-bus.c
index 9470bd7..2d236b3 100644
--- a/hw/char/virtio-serial-bus.c
+++ b/hw/char/virtio-serial-bus.c
@@ -664,9 +664,9 @@ static void virtio_serial_save_device(VirtIODevice *vdev, QEMUFile *f)
 
     /* The config space (ignored on the far end in current versions) */
     get_config(vdev, (uint8_t *)&config);
-    qemu_put_be16s(f, &config.cols);
-    qemu_put_be16s(f, &config.rows);
-    qemu_put_be32s(f, &config.max_nr_ports);
+    qemu_put_be16(f, config.cols);
+    qemu_put_be16(f, config.rows);
+    qemu_put_be32(f, config.max_nr_ports);
 
     /* The ports map */
     max_nr_ports = s->serial.max_virtserial_ports;
diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index 093675e..3c17207 100644
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -638,8 +638,11 @@ static void slave_read(void *opaque)
 
     switch (msg.request) {
     case VHOST_USER_SLAVE_IOTLB_MSG:
-        ret = vhost_backend_handle_iotlb_msg(dev, &msg.payload.iotlb);
-        break;
+        {
+            struct vhost_iotlb_msg iotlb = msg.payload.iotlb;
+            ret = vhost_backend_handle_iotlb_msg(dev, &iotlb);
+            break;
+        }
     default:
         error_report("Received unexpected msg type.");
         ret = -EINVAL;
-- 
1.8.3.1