[PULL 50/52] hw/scsi/vhost-scsi: don't leak vqs on error

["Michael S. Tsirkin" <mst@redhat.com>]

From: Daniil Tatianin <d-tatianin@yandex-team.ru>

vhost_dev_init calls vhost_dev_cleanup in case of an error during
initialization, which zeroes out the entire vsc->dev as well as the
vsc->dev.vqs pointer. This prevents us from properly freeing it in free_vqs.
Keep a local copy of the pointer so we can free it later.

Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Message-Id: <20211129132358.1110372-1-d-tatianin@yandex-team.ru>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/scsi/vhost-scsi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c
index 039caf2614..efb3e14d9e 100644
--- a/hw/scsi/vhost-scsi.c
+++ b/hw/scsi/vhost-scsi.c
@@ -170,6 +170,7 @@ static void vhost_scsi_realize(DeviceState *dev, Error **errp)
     Error *err = NULL;
     int vhostfd = -1;
     int ret;
+    struct vhost_virtqueue *vqs = NULL;
 
     if (!vs->conf.wwpn) {
         error_setg(errp, "vhost-scsi: missing wwpn");
@@ -213,7 +214,8 @@ static void vhost_scsi_realize(DeviceState *dev, Error **errp)
     }
 
     vsc->dev.nvqs = VHOST_SCSI_VQ_NUM_FIXED + vs->conf.num_queues;
-    vsc->dev.vqs = g_new0(struct vhost_virtqueue, vsc->dev.nvqs);
+    vqs = g_new0(struct vhost_virtqueue, vsc->dev.nvqs);
+    vsc->dev.vqs = vqs;
     vsc->dev.vq_index = 0;
     vsc->dev.backend_features = 0;
 
@@ -232,7 +234,7 @@ static void vhost_scsi_realize(DeviceState *dev, Error **errp)
     return;
 
  free_vqs:
-    g_free(vsc->dev.vqs);
+    g_free(vqs);
     if (!vsc->migratable) {
         migrate_del_blocker(vsc->migration_blocker);
     }
-- 
MST