diff --git a/hw/vhost.c b/hw/vhost.c
index 8d3ba5b608..7e282dd3d5 100644
--- a/hw/vhost.c
+++ b/hw/vhost.c
@@ -31,11 +31,11 @@ static void vhost_dev_sync_region(struct vhost_dev *dev,
     vhost_log_chunk_t *to = dev->log + end / VHOST_LOG_CHUNK + 1;
     uint64_t addr = (start / VHOST_LOG_CHUNK) * VHOST_LOG_CHUNK;
 
-    assert(end / VHOST_LOG_CHUNK < dev->log_size);
-    assert(start / VHOST_LOG_CHUNK < dev->log_size);
     if (end < start) {
         return;
     }
+    assert(end / VHOST_LOG_CHUNK < dev->log_size);
+
     for (;from < to; ++from) {
         vhost_log_chunk_t log;
         int bit;
@@ -277,8 +277,9 @@ static inline void vhost_dev_log_resize(struct vhost_dev* dev, uint64_t size)
     r = ioctl(dev->control, VHOST_SET_LOG_BASE, &log_base);
     assert(r >= 0);
     for (i = 0; i < dev->n_mem_sections; ++i) {
-        vhost_sync_dirty_bitmap(dev, &dev->mem_sections[i],
-                                0, (target_phys_addr_t)~0x0ull);
+        /* Sync only the range covered by the old log */
+        vhost_sync_dirty_bitmap(dev, &dev->mem_sections[i], 0,
+                                dev->log_size * VHOST_LOG_CHUNK - 1);
     }
     if (dev->log) {
         g_free(dev->log);