[PATCH] IB/hfi1: Fix SL array bounds check

[PATCH] IB/hfi1: Fix SL array bounds check

[ira.weiny]

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@vger.kernel.org # 4.9.x
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>
---
 drivers/infiniband/hw/hfi1/verbs.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/hfi1/verbs.c b/drivers/infiniband/hw/hfi1/verbs.c
index 01a380efea6b..14ddb7506085 100644
--- a/drivers/infiniband/hw/hfi1/verbs.c
+++ b/drivers/infiniband/hw/hfi1/verbs.c
@@ -1511,12 +1511,18 @@ static int hfi1_check_ah(struct ib_device *ibdev, struct ib_ah_attr *ah_attr)
 	struct hfi1_pportdata *ppd;
 	struct hfi1_devdata *dd;
 	u8 sc5;
+	u8 sl;
 
 	/* test the mapping for validity */
 	ibp = to_iport(ibdev, ah_attr->port_num);
 	ppd = ppd_from_ibp(ibp);
-	sc5 = ibp->sl_to_sc[ah_attr->sl];
 	dd = dd_from_ppd(ppd);
+
+	sl = ah_attr->sl;
+	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;
-- 
1.7.12.4