4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Michael J. Ruhl <michael.j.ruhl@xxxxxxxxx>
commit 8561eae60ff9417a50fa1fb2b83ae950dc5c1e21 upstream.
The Infiniband spec defines "A multicast address is defined by a
MGID and a MLID" (section 10.5). Currently the MLID value is not
validated.
Add check to verify that the MLID value is in the correct address
range.
Fixes: 0c33aeedb2cf ("[IB] Add checks to multicast attach and detach")
Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx>
Reviewed-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@xxxxxxxxx>
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@xxxxxxxxx>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
Reviewed-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/core/verbs.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -1516,7 +1516,9 @@ int ib_attach_mcast(struct ib_qp *qp, un
if (!qp->device->attach_mcast)
return -ENOSYS;
- if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
+ if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD ||
+ lid < be16_to_cpu(IB_MULTICAST_LID_BASE) ||
+ lid == be16_to_cpu(IB_LID_PERMISSIVE))
return -EINVAL;
ret = qp->device->attach_mcast(qp, gid, lid);
@@ -1532,7 +1534,9 @@ int ib_detach_mcast(struct ib_qp *qp, un
if (!qp->device->detach_mcast)
return -ENOSYS;
- if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
+ if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD ||
+ lid < be16_to_cpu(IB_MULTICAST_LID_BASE) ||
+ lid == be16_to_cpu(IB_LID_PERMISSIVE))
return -EINVAL;
ret = qp->device->detach_mcast(qp, gid, lid);