IB/mlx4: Check gid_index return value

commit 37995116fecfce2b61ee3da6e73b3e394c6818f9 upstream.

Check the returned GID index value and return an error if it is invalid.

Fixes: 5070cd2239bd ('IB/mlx4: Replace mechanism for RoCE GID management')
Signed-off-by: Daniel Jurgens <danielj@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/infiniband/hw/mlx4/ah.c b/drivers/infiniband/hw/mlx4/ah.c
index 06da56bda201283e474147b84bbdc05901abfe01..c007c766c61e4ad3f20c1099b2f553cdb1f9cfde 100644 (file)
--- a/drivers/infiniband/hw/mlx4/ah.c
+++ b/drivers/infiniband/hw/mlx4/ah.c
@@ -102,7 +102,10 @@ static struct ib_ah *create_iboe_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr
        if (vlan_tag < 0x1000)
                vlan_tag |= (ah_attr->sl & 7) << 13;
        ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
-       ah->av.eth.gid_index = mlx4_ib_gid_index_to_real_index(ibdev, ah_attr->port_num, ah_attr->grh.sgid_index);
+       ret = mlx4_ib_gid_index_to_real_index(ibdev, ah_attr->port_num, ah_attr->grh.sgid_index);
+       if (ret < 0)
+               return ERR_PTR(ret);
+       ah->av.eth.gid_index = ret;
        ah->av.eth.vlan = cpu_to_be16(vlan_tag);
        if (ah_attr->static_rate) {
                ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;