[PATCH] scsi-generic: do not snoop the output of failed commands

[PATCH] scsi-generic: do not snoop the output of failed commands

[Paolo Bonzini]

If a READ CAPACITY command would fail, for example s->qdev.blocksize would be
set to zero and cause a division by zero on the next use.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/scsi/scsi-generic.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
index cf7e11cf44..f9fd2ccfdd 100644
--- a/hw/scsi/scsi-generic.c
+++ b/hw/scsi/scsi-generic.c
@@ -288,7 +288,10 @@ static void scsi_read_complete(void * opaque, int ret)
         }
     }
 
-    if (len == 0) {
+    if (r->io_header.host_status != SCSI_HOST_OK ||
+        (r->io_header.driver_status & SG_ERR_DRIVER_TIMEOUT) ||
+        r->io_header.status != GOOD ||
+        len == 0) {
         scsi_command_complete_noio(r, 0);
         goto done;
     }
-- 
2.29.2