[PATCH v2 1/2] RDMA/uverbs: Fix the check for port number

[Mustafa Ismail]

The port number is only valid if IB_QP_PORT is set in the mask.
So only check port number if it is valid to prevent modify_qp from
failing due to an invalid port number.

Fixes: 5ecce4c9b17b("Check port number supplied by user verbs cmds")
Cc: <sta...@vger.kernel.org> # v2.6.14+
Reviewed-by: Steve Wise <sw...@opengridcomputing.com>
Signed-off-by: Mustafa Ismail <mustafa.ism...@intel.com>
---
 drivers/infiniband/core/uverbs_cmd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/uverbs_cmd.c 
b/drivers/infiniband/core/uverbs_cmd.c
index 8ba9bfb..19de068 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -1935,7 +1935,8 @@ static int modify_qp(struct ib_uverbs_file *file,
                goto out;
        }
 
-       if (!rdma_is_port_valid(qp->device, cmd->base.port_num)) {
+       if ((cmd->base.attr_mask & IB_QP_PORT) &&
+           !rdma_is_port_valid(qp->device, cmd->base.port_num)) {
                ret = -EINVAL;
                goto release_qp;
        }
-- 
2.7.4