RDMA/ocrdma: Don't allow zero/invalid sgid usage

Signed-off-by: Naresh Gottumukkala <bgottumukkala@emulex.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
index 6bbcc786ef6d..af01ba202d40 100644
--- a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
+++ b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
@@ -2124,9 +2124,10 @@ static int ocrdma_set_av_params(struct ocrdma_qp *qp,
 {
         int status;
         struct ib_ah_attr *ah_attr = &attrs->ah_attr;
-        union ib_gid sgid;
+        union ib_gid sgid, zgid;
         u32 vlan_id;
         u8 mac_addr[6];
+
         if ((ah_attr->ah_flags & IB_AH_GRH) == 0)
                 return -EINVAL;
         cmd->params.tclass_sq_psn |=
@@ -2142,6 +2143,11 @@ static int ocrdma_set_av_params(struct ocrdma_qp *qp,
                          ah_attr->grh.sgid_index, &sgid);
         if (status)
                 return status;
+
+        memset(&zgid, 0, sizeof(zgid));
+        if (!memcmp(&sgid, &zgid, sizeof(zgid)))
+                return -EINVAL;
+
         qp->sgid_idx = ah_attr->grh.sgid_index;
         memcpy(&cmd->params.sgid[0], &sgid.raw[0], sizeof(cmd->params.sgid));
         ocrdma_resolve_dgid(qp->dev, &ah_attr->grh.dgid, &mac_addr[0]);