[Qemu-devel] [PATCH for 3.1 3/4] virtio-scsi/migration: Allow load_request to fail

["Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>]

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

Rather than asserting, check values and return NULL
on failure.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 hw/scsi/virtio-scsi.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
index 6301af76ad..3441bfe6d7 100644
--- a/hw/scsi/virtio-scsi.c
+++ b/hw/scsi/virtio-scsi.c
@@ -204,7 +204,11 @@ static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq)
     uint32_t n;
 
     qemu_get_be32s(f, &n);
-    assert(n < vs->conf.num_queues);
+    if (n >= vs->conf.num_queues) {
+        error_report("%s: Bad queue number (%d vs %d)",
+                     __func__, n, vs->conf.num_queues);
+        return NULL;
+    }
     req = qemu_get_virtqueue_element(vdev, f,
                                      sizeof(VirtIOSCSIReq) + vs->cdb_size);
     if (!req) {
@@ -216,13 +220,18 @@ static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq)
     if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size,
                               sizeof(VirtIOSCSICmdResp) + vs->sense_size) < 0) {
         error_report("invalid SCSI request migration data");
-        exit(1);
+        return NULL;
     }
 
     scsi_req_ref(sreq);
     req->sreq = sreq;
     if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
-        assert(req->sreq->cmd.mode == req->mode);
+        if (req->sreq->cmd.mode != req->mode) {
+            error_report("%s: Bad mode (%d vs %d)",
+                         __func__, req->sreq->cmd.mode, req->mode);
+            scsi_req_unref(sreq);
+            return NULL;
+        }
     }
     return req;
 }
-- 
2.17.1