[PATCH] virtio-blk: Fix potential nullpointer read access in virtio_blk_data_plane_destroy

[Stefan Weil via]

Fixes: CID 1532828
Fixes: b6948ab01d ("virtio-blk: add iothread-vq-mapping parameter")
Signed-off-by: Stefan Weil <s...@weilnetz.de>
---
 hw/block/dataplane/virtio-blk.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c
index 6debd4401e..97a302cf49 100644
--- a/hw/block/dataplane/virtio-blk.c
+++ b/hw/block/dataplane/virtio-blk.c
@@ -152,7 +152,7 @@ bool virtio_blk_data_plane_create(VirtIODevice *vdev, 
VirtIOBlkConf *conf,
 void virtio_blk_data_plane_destroy(VirtIOBlockDataPlane *s)
 {
     VirtIOBlock *vblk;
-    VirtIOBlkConf *conf = s->conf;
+    VirtIOBlkConf *conf;
 
     if (!s) {
         return;
@@ -160,6 +160,7 @@ void virtio_blk_data_plane_destroy(VirtIOBlockDataPlane *s)
 
     vblk = VIRTIO_BLK(s->vdev);
     assert(!vblk->dataplane_started);
+    conf = s->conf;
 
     if (conf->iothread_vq_mapping_list) {
         IOThreadVirtQueueMappingList *node;
-- 
2.39.2