rdma_cm: fail iwarp accepts w/o connection params

commit f2625f7db4dd0bbd16a9c7d2950e7621f9aa57ad upstream.

cma_accept_iw() needs to return an error if conn_params is NULL.
Since this is coming from user space, we can crash.

Reported-by: Shaobo He <shaobo@cs.utah.edu>
Acked-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index c25768c2dd3b..f2d40c05ef9e 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -3540,6 +3540,9 @@ static int cma_accept_iw(struct rdma_id_private *id_priv,
         struct iw_cm_conn_param iw_param;
         int ret;
 
+        if (!conn_param)
+                return -EINVAL;
+
         ret = cma_modify_qp_rtr(id_priv, conn_param);
         if (ret)
                 return ret;