hw/s390x/virtio-ccw.c: Don't take address of fields in packed structs

Taking the address of a field in a packed struct is a bad idea, because
it might not be actually aligned enough for that pointer type (and
thus cause a crash on dereference on some host architectures). Newer
versions of clang warn about this. Avoid the bug by not using the
"modify in place" byte swapping functions.

Patch produced with scripts/coccinelle/inplace-byteswaps.cocci
(with a couple of long lines manually wrapped).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20181210120436.30522-1-peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

hw/s390x/virtio-ccw.c

@@ -287,18 +287,18 @@ static int virtio_ccw_handle_set_vq(SubchDev *sch, CCW1 ccw, bool check_len,
     }
     if (is_legacy) {
         ccw_dstream_read(&sch->cds, linfo);
-        be64_to_cpus(&linfo.queue);
-        be32_to_cpus(&linfo.align);
-        be16_to_cpus(&linfo.index);
-        be16_to_cpus(&linfo.num);
+        linfo.queue = be64_to_cpu(linfo.queue);
+        linfo.align = be32_to_cpu(linfo.align);
+        linfo.index = be16_to_cpu(linfo.index);
+        linfo.num = be16_to_cpu(linfo.num);
         ret = virtio_ccw_set_vqs(sch, NULL, &linfo);
     } else {
         ccw_dstream_read(&sch->cds, info);
-        be64_to_cpus(&info.desc);
-        be16_to_cpus(&info.index);
-        be16_to_cpus(&info.num);
-        be64_to_cpus(&info.avail);
-        be64_to_cpus(&info.used);
+        info.desc = be64_to_cpu(info.desc);
+        info.index = be16_to_cpu(info.index);
+        info.num = be16_to_cpu(info.num);
+        info.avail = be64_to_cpu(info.avail);
+        info.used = be64_to_cpu(info.used);
         ret = virtio_ccw_set_vqs(sch, &info, NULL);
     }
     sch->curr_status.scsw.count = 0;
@@ -382,7 +382,7 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
                 features.features = 0;
             }
             ccw_dstream_rewind(&sch->cds);
-            cpu_to_le32s(&features.features);
+            features.features = cpu_to_le32(features.features);
             ccw_dstream_write(&sch->cds, features.features);
             sch->curr_status.scsw.count = ccw.count - sizeof(features);
             ret = 0;
@@ -403,7 +403,7 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
             ret = -EFAULT;
         } else {
             ccw_dstream_read(&sch->cds, features);
-            le32_to_cpus(&features.features);
+            features.features = le32_to_cpu(features.features);
             if (features.index == 0) {
                 virtio_set_features(vdev,
                                     (vdev->guest_features & 0xffffffff00000000ULL) |
@@ -546,7 +546,7 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
             ret = -EFAULT;
         } else {
             ccw_dstream_read(&sch->cds, indicators);
-            be64_to_cpus(&indicators);
+            indicators = be64_to_cpu(indicators);
             dev->indicators = get_indicator(indicators, sizeof(uint64_t));
             sch->curr_status.scsw.count = ccw.count - sizeof(indicators);
             ret = 0;
@@ -567,7 +567,7 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
             ret = -EFAULT;
         } else {
             ccw_dstream_read(&sch->cds, indicators);
-            be64_to_cpus(&indicators);
+            indicators = be64_to_cpu(indicators);
             dev->indicators2 = get_indicator(indicators, sizeof(uint64_t));
             sch->curr_status.scsw.count = ccw.count - sizeof(indicators);
             ret = 0;
@@ -588,14 +588,14 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
             ret = -EFAULT;
         } else {
             ccw_dstream_read(&sch->cds, vq_config.index);
-            be16_to_cpus(&vq_config.index);
+            vq_config.index = be16_to_cpu(vq_config.index);
             if (vq_config.index >= VIRTIO_QUEUE_MAX) {
                 ret = -EINVAL;
                 break;
             }
             vq_config.num_max = virtio_queue_get_num(vdev,
                                                      vq_config.index);
-            cpu_to_be16s(&vq_config.num_max);
+            vq_config.num_max = cpu_to_be16(vq_config.num_max);
             ccw_dstream_write(&sch->cds, vq_config.num_max);
             sch->curr_status.scsw.count = ccw.count - sizeof(vq_config);
             ret = 0;
@@ -621,9 +621,11 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
             if (ccw_dstream_read(&sch->cds, thinint)) {
                 ret = -EFAULT;
             } else {
-                be64_to_cpus(&thinint.ind_bit);
-                be64_to_cpus(&thinint.summary_indicator);
-                be64_to_cpus(&thinint.device_indicator);
+                thinint.ind_bit = be64_to_cpu(thinint.ind_bit);
+                thinint.summary_indicator =
+                    be64_to_cpu(thinint.summary_indicator);
+                thinint.device_indicator =
+                    be64_to_cpu(thinint.device_indicator);
 
                 dev->summary_indicator =
                     get_indicator(thinint.summary_indicator, sizeof(uint8_t));
@@ -654,8 +656,8 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
             break;
         }
         ccw_dstream_read_buf(&sch->cds, &revinfo, 4);
-        be16_to_cpus(&revinfo.revision);
-        be16_to_cpus(&revinfo.length);
+        revinfo.revision = be16_to_cpu(revinfo.revision);
+        revinfo.length = be16_to_cpu(revinfo.length);
         if (ccw.count < len + revinfo.length ||
             (check_len && ccw.count > len + revinfo.length)) {
             ret = -EINVAL;