RDMA/uverbs: Fix the check for port number

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: <stable@vger.kernel.org> # v2.6.14+
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Mustafa Ismail <mustafa.ismail@intel.com>
Tested-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 71451eae42de48f5c1cc4458808fcae4c9e2b0f5..2c98533a0203b084fb198a3eb8088a0bac59522c 100644 (file)
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -1933,7 +1933,8 @@ 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;
        }