IB/iser: Handle iser_device allocation error gracefully

"iser_device" allocation failure is "handled" with a BUG_ON() right
before dereferencing the NULL-pointer - fix this!

Signed-off-by: Arne Redlich <arne.redlich@xiranet.com>
Signed-off-by: Erez Zilber <erezz@voltaire.com>

1 files changed, 9 insertions, 4 deletions

diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c
index 768ba69f2fd9..993f0a8ff28f 100644
--- a/drivers/infiniband/ulp/iser/iser_verbs.c
+++ b/drivers/infiniband/ulp/iser/iser_verbs.c
@@ -244,7 +244,7 @@ struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
         list_for_each_entry(device, &ig.device_list, ig_list)
                 /* find if there's a match using the node GUID */
                 if (device->ib_device->node_guid == cma_id->device->node_guid)
-                        goto out;
+                        goto inc_refcnt;
 
         device = kzalloc(sizeof *device, GFP_KERNEL);
         if (device == NULL)
@@ -260,9 +260,9 @@ struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
         }
         list_add(&device->ig_list, &ig.device_list);
 
-out:
-        BUG_ON(device == NULL);
+inc_refcnt:
         device->refcount++;
+out:
         mutex_unlock(&ig.device_list_mutex);
         return device;
 }
@@ -368,6 +368,12 @@ static void iser_addr_handler(struct rdma_cm_id *cma_id)
         int    ret;
 
         device = iser_device_find_by_ib_device(cma_id);
+        if (!device) {
+                iser_err("device lookup/creation failed\n");
+                iser_connect_error(cma_id);
+                return;
+        }
+
         ib_conn = (struct iser_conn *)cma_id->context;
         ib_conn->device = device;
 
@@ -376,7 +382,6 @@ static void iser_addr_handler(struct rdma_cm_id *cma_id)
                 iser_err("resolve route failed: %d\n", ret);
                 iser_connect_error(cma_id);
         }
-        return;
 }
 
 static void iser_route_handler(struct rdma_cm_id *cma_id)