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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 <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>
This commit is contained in:
P J P 2017-04-25 18:36:23 +05:30 committed by Paolo Bonzini
parent c8c33fca88
commit f68826989c
1 changed files with 1 additions and 1 deletions
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2
hw/scsi/vmw_pvscsi.c
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@ -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;