From: P J P Date: Tue, 25 Apr 2017 18:36:23 +0530 Subject: [PATCH] vmw_pvscsi: check message ring page count at initialisation A guest could set the message ring page count to zero, resulting in infinite loop. Add check to avoid it. Reported-by: YY Z Signed-off-by: P J P Message-Id: <20170425130623.3649-1-ppandit@redhat.com> Reviewed-by: Dmitry Fleytman Signed-off-by: Paolo Bonzini (cherry picked from commit f68826989cd4d1217797251339579c57b3c0934e) --- 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;