scsi: mpi3mr: Sanitise num_phys

[ Upstream commit 3668651 ]

Information is stored in mr_sas_port->phy_mask, values larger then size of
this field shouldn't be allowed.

Signed-off-by: Tomas Henzl <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Acked-by: Sathya Prakash Veerichetty <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>
[patched it to the out-of-tree mpi3mr driver]
Signed-off-by: Mahmoud Adam <[email protected]>

Author: mngyadam

drivers/scsi/mpi3mr/mpi3mr_transport.c

@@ -1082,11 +1082,21 @@ static struct mpi3mr_sas_port * mpi3mr_sas_port_add(struct mpi3mr_ioc *mrioc,
 	mpi3mr_sas_port_sanity_check(mrioc, mr_sas_node,
 	    mr_sas_port->remote_identify.sas_address, hba_port);
 
+	if (mr_sas_node->num_phys > sizeof(mr_sas_port->phy_mask) * 8)
+		ioc_info(mrioc, "max port count %u could be too high\n",
+		    mr_sas_node->num_phys);
+
 	for (i = 0; i < mr_sas_node->num_phys; i++) {
 		if ((mr_sas_node->phy[i].remote_identify.sas_address !=
 		    mr_sas_port->remote_identify.sas_address) ||
 		    (mr_sas_node->phy[i].hba_port != hba_port))
 			continue;
+
+		if (i > sizeof(mr_sas_port->phy_mask) * 8) {
+			ioc_warn(mrioc, "skipping port %u, max allowed value is %lu\n",
+			    i, sizeof(mr_sas_port->phy_mask) * 8);
+			goto out_fail;
+		}
 		list_add_tail(&mr_sas_node->phy[i].port_siblings,
 		    &mr_sas_port->phy_list);
 		mr_sas_port->num_phys++;