[Qemu-devel] [PULL 09/21] vmw_pvscsi: check message ring page count at initialisation

[Paolo Bonzini <pbonzini@redhat.com>]

From: P J P <ppandit@redhat.com>

A guest could set the message ring page count to zero, resulting in
infinite loop. Add check to avoid it.

Reported-by: YY Z <bigbird475958471@gmail.com>
Signed-off-by: P J P <ppandit@redhat.com>
Message-Id: <20170425130623.3649-1-ppandit@redhat.com>
Reviewed-by: Dmitry Fleytman <dmitry@daynix.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/scsi/vmw_pvscsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/scsi/vmw_pvscsi.c b/hw/scsi/vmw_pvscsi.c
index 75575461e2..4a106da856 100644
--- a/hw/scsi/vmw_pvscsi.c
+++ b/hw/scsi/vmw_pvscsi.c
@@ -202,7 +202,7 @@ pvscsi_ring_init_msg(PVSCSIRingInfo *m, PVSCSICmdDescSetupMsgRing *ri)
     uint32_t len_log2;
     uint32_t ring_size;
 
-    if (ri->numPages > PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES) {
+    if (!ri->numPages || ri->numPages > PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES) {
         return -1;
     }
     ring_size = ri->numPages * PVSCSI_MAX_NUM_MSG_ENTRIES_PER_PAGE;
-- 
2.12.2