Hello Roopa Prabhu, This is a semi-automatic email about new static checker warnings. The patch efa5356b0d97: "bridge: per vlan dst_metadata netlink support" from Jan 31, 2017, leads to the following Smatch complaint: net/bridge/br_netlink_tunnel.c:144 br_fill_vlan_tinfo_range() error: we previously assumed 'vtbegin' could be null (see line 130) net/bridge/br_netlink_tunnel.c 129 130 if (vtbegin && vtend && (vtend->vid - vtbegin->vid) > 0) { ^^^^^^^ Check for NULL. 131 /* add range to skb */ 132 err = br_fill_vlan_tinfo(skb, vtbegin->vid, 133 vtbegin->tinfo.tunnel_id, 134 BRIDGE_VLAN_INFO_RANGE_BEGIN); 135 if (err) 136 return err; 137 138 err = br_fill_vlan_tinfo(skb, vtend->vid, 139 vtend->tinfo.tunnel_id, 140 BRIDGE_VLAN_INFO_RANGE_END); 141 if (err) 142 return err; 143 } else { 144 err = br_fill_vlan_tinfo(skb, vtbegin->vid, ^^^^^^^^^^^^ Unchecked dereference. 145 vtbegin->tinfo.tunnel_id, 146 0); regards, dan carpenter