IB/hfi1: Fix SL array bounds check

The SL specified by a user needs to be a valid SL.

Add a range check to the user specified SL value which protects from
running off the end of the SL to SC table.

CC: stable@vger.kernel.org
Fixes: 7724105686e7 ("IB/hfi1: add driver files")
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/hw/hfi1/verbs.c b/drivers/infiniband/hw/hfi1/verbs.c
index 13374c7..a7c586a 100644 (file)
--- a/drivers/infiniband/hw/hfi1/verbs.c
+++ b/drivers/infiniband/hw/hfi1/verbs.c
@@ -1582,6 +1582,7 @@ static int hfi1_check_ah(struct ib_device *ibdev, struct rdma_ah_attr *ah_attr)
        struct hfi1_pportdata *ppd;
        struct hfi1_devdata *dd;
        u8 sc5;
+       u8 sl;
 
        if (hfi1_check_mcast(rdma_ah_get_dlid(ah_attr)) &&
            !(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
@@ -1590,8 +1591,13 @@ static int hfi1_check_ah(struct ib_device *ibdev, struct rdma_ah_attr *ah_attr)
        /* test the mapping for validity */
        ibp = to_iport(ibdev, rdma_ah_get_port_num(ah_attr));
        ppd = ppd_from_ibp(ibp);
-       sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
        dd = dd_from_ppd(ppd);
+
+       sl = rdma_ah_get_sl(ah_attr);
+       if (sl >= ARRAY_SIZE(ibp->sl_to_sc))
+               return -EINVAL;
+
+       sc5 = ibp->sl_to_sc[sl];
        if (sc_to_vlt(dd, sc5) > num_vls && sc_to_vlt(dd, sc5) != 0xf)
                return -EINVAL;
        return 0;