virtio/virtio_mem: handle a possible NULL as a memcpy parameter

[platform/kernel/linux-rpi.git] / drivers / virtio / virtio_mem.c

diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index bef8ad6..4624a2c 100644 (file)
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -577,7 +577,7 @@ static int virtio_mem_sbm_sb_states_prepare_next_mb(struct virtio_mem *vm)
                return -ENOMEM;
 
        mutex_lock(&vm->hotplug_mutex);
-       if (new_bitmap)
+       if (vm->sbm.sb_states)
                memcpy(new_bitmap, vm->sbm.sb_states, old_pages * PAGE_SIZE);
 
        old_bitmap = vm->sbm.sb_states;