RDMA/cxgb3: Handle NULL inetdev pointer in iwch_query_port()

in_dev_get() can return NULL.  If it does, iwch_query_port() will crash.
Handle the NULL case by mapping it to port state INIT.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/infiniband/hw/cxgb3/iwch_provider.c b/drivers/infiniband/hw/cxgb3/iwch_provider.c
index 6895523779d0..03cfaecc3bb7 100644
--- a/drivers/infiniband/hw/cxgb3/iwch_provider.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_provider.c
@@ -1199,11 +1199,14 @@ static int iwch_query_port(struct ib_device *ibdev,
                 props->state = IB_PORT_DOWN;
         else {
                 inetdev = in_dev_get(netdev);
-                if (inetdev->ifa_list)
-                        props->state = IB_PORT_ACTIVE;
-                else
+                if (inetdev) {
+                        if (inetdev->ifa_list)
+                                props->state = IB_PORT_ACTIVE;
+                        else
+                                props->state = IB_PORT_INIT;
+                        in_dev_put(inetdev);
+                } else
                         props->state = IB_PORT_INIT;
-                in_dev_put(inetdev);
         }
 
         props->port_cap_flags =