4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ira Weiny <ira.weiny@xxxxxxxxx>
commit 0dbfaa9f2813787679e296eb5476e40938ab48c8 upstream.
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@xxxxxxxxxxxxxxx
Fixes: 7724105686e7 ("IB/hfi1: add driver files")
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/hw/hfi1/verbs.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/drivers/infiniband/hw/hfi1/verbs.c
+++ b/drivers/infiniband/hw/hfi1/verbs.c
@@ -1573,6 +1573,7 @@ static int hfi1_check_ah(struct ib_devic
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))
@@ -1581,8 +1582,13 @@ static int hfi1_check_ah(struct ib_devic
/* 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;
