Fix memif coverity issues

Change-Id: I1cd649e1d4582792f75d0db60a9524471fc76a9f
Signed-off-by: Milan Lenco <milan.lenco@pantheon.tech>

3 files changed, 32 insertions, 9 deletions

diff --git a/src/plugins/memif/device.c b/src/plugins/memif/device.c
index 446537a3792..899c78dc38f 100644
--- a/src/plugins/memif/device.c
+++ b/src/plugins/memif/device.c
@@ -272,9 +272,11 @@ static clib_error_t *
 memif_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
 {
   memif_main_t *apm = &memif_main;
-  memif_msg_t msg;
+  vlib_main_t *vm = vlib_get_main ();
+  memif_msg_t msg = { 0 };
   vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
   memif_if_t *mif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
+  static clib_error_t *error = 0;
 
   if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
     mif->flags |= MEMIF_IF_FLAG_ADMIN_UP;
@@ -286,11 +288,17 @@ memif_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
 	{
 	  msg.version = MEMIF_VERSION;
 	  msg.type = MEMIF_MSG_TYPE_DISCONNECT;
-	  send (mif->connection.fd, &msg, sizeof (msg), 0);
+	  if (send (mif->connection.fd, &msg, sizeof (msg), 0) < 0)
+	    {
+	      clib_unix_warning ("Failed to send disconnect request");
+	      error = clib_error_return_unix (0, "send fd %d",
+					      mif->connection.fd);
+	      memif_disconnect (vm, mif);
+	    }
 	}
     }
 
-  return 0;
+  return error;
 }
 
 static clib_error_t *
diff --git a/src/plugins/memif/memif.c b/src/plugins/memif/memif.c
index 7ba67c5b898..3ea95f3bb6e 100644
--- a/src/plugins/memif/memif.c
+++ b/src/plugins/memif/memif.c
@@ -85,7 +85,7 @@ memif_connect (vlib_main_t * vm, memif_if_t * mif)
 			       VNET_HW_INTERFACE_FLAG_LINK_UP);
 }
 
-static void
+void
 memif_disconnect (vlib_main_t * vm, memif_if_t * mif)
 {
   vnet_main_t *vnm = vnet_get_main ();
@@ -248,7 +248,12 @@ response:
   resp.version = MEMIF_VERSION;
   resp.type = MEMIF_MSG_TYPE_CONNECT_RESP;
   resp.retval = retval;
-  send (fd, &resp, sizeof (resp), 0);
+  if (send (fd, &resp, sizeof (resp), 0) < 0)
+    {
+      DEBUG_UNIX_LOG ("Failed to send connection response");
+      error = clib_error_return_unix (0, "send fd %d", fd);
+      memif_disconnect (vm, mif);
+    }
   return error;
 }
 
@@ -511,7 +516,8 @@ memif_connect_master (vlib_main_t * vm, memif_if_t * mif)
 	{
 	  u16 slot = i * (1 << mif->log2_ring_size) + j;
 	  ring->desc[j].region = 0;
-	  ring->desc[j].offset = buffer_offset + (slot * mif->buffer_size);
+	  ring->desc[j].offset =
+	    buffer_offset + (u32) (slot * mif->buffer_size);
 	  ring->desc[j].buffer_length = mif->buffer_size;
 	}
     }
@@ -524,7 +530,8 @@ memif_connect_master (vlib_main_t * vm, memif_if_t * mif)
 	  u16 slot =
 	    (i + mif->num_s2m_rings) * (1 << mif->log2_ring_size) + j;
 	  ring->desc[j].region = 0;
-	  ring->desc[j].offset = buffer_offset + (slot * mif->buffer_size);
+	  ring->desc[j].offset =
+	    buffer_offset + (u32) (slot * mif->buffer_size);
 	  ring->desc[j].buffer_length = mif->buffer_size;
 	}
     }
@@ -595,6 +602,11 @@ memif_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
   f64 start_time, last_run_duration = 0, now;
 
   sockfd = socket (AF_UNIX, SOCK_STREAM, 0);
+  if (sockfd < 0)
+    {
+      DEBUG_UNIX_LOG ("socket AF_UNIX");
+      return 0;
+    }
   sun.sun_family = AF_UNIX;
   template.read_function = memif_conn_fd_read_ready;
 
@@ -734,26 +746,28 @@ int
 memif_worker_thread_enable ()
 {
   /* if worker threads are enabled, switch to polling mode */
+  /* *INDENT-OFF* */
   foreach_vlib_main ((
 		       {
 		       vlib_node_set_state (this_vlib_main,
 					    memif_input_node.index,
 					    VLIB_NODE_STATE_POLLING);
 		       }));
-
+  /* *INDENT-ON* */
   return 0;
 }
 
 int
 memif_worker_thread_disable ()
 {
+  /* *INDENT-OFF* */
   foreach_vlib_main ((
 		       {
 		       vlib_node_set_state (this_vlib_main,
 					    memif_input_node.index,
 					    VLIB_NODE_STATE_INTERRUPT);
 		       }));
-
+  /* *INDENT-ON* */
   return 0;
 }
 
diff --git a/src/plugins/memif/memif.h b/src/plugins/memif/memif.h
index a7a88e07b0e..6154829764f 100644
--- a/src/plugins/memif/memif.h
+++ b/src/plugins/memif/memif.h
@@ -194,6 +194,7 @@ typedef struct
 
 int memif_create_if (vlib_main_t * vm, memif_create_if_args_t * args);
 int memif_delete_if (vlib_main_t * vm, u64 key);
+void memif_disconnect (vlib_main_t * vm, memif_if_t * mif);
 clib_error_t *memif_plugin_api_hookup (vlib_main_t * vm);
 
 #ifndef __NR_memfd_create