netdev - Re: bridge: per vlan dst_metadata netlink support

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Date:   Tue, 7 Feb 2017 12:29:16 +0100
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Colin Ian King <colin.king@...onical.com>,
        Roopa Prabhu <roopa@...ulusnetworks.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        bridge@...ts.linux-foundation.org,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: bridge: per vlan dst_metadata netlink support

On 07/02/17 12:25, Colin Ian King wrote:
> Hi,
> 
> Static analysis with CoverityScan on net/bridge/br_netlink_tunnel.c has
> picked up and issue where tb[] is being referenced but contains
> uninitialized data.
> 
> 222 int br_parse_vlan_tunnel_info(struct nlattr *attr,
> 223                               struct vtunnel_info *tinfo)
> 224 {
> 
>     1. var_decl: Declaring variable tb without initializer.
> 
> 225         struct nlattr *tb[IFLA_BRIDGE_VLAN_TUNNEL_MAX + 1];
> 226         u32 tun_id;
> 227         u16 vid, flags = 0;
> 228         int err;
> 229
> 230         memset(tinfo, 0, sizeof(*tinfo));
> 231
> 
>     CID 1400055 (#1 of 1): Uninitialized pointer read (UNINIT)2.
> uninit_use: Using uninitialized value tb[IFLA_BRIDGE_VLAN_TUNNEL_ID].
> 
> 232         if (!tb[IFLA_BRIDGE_VLAN_TUNNEL_ID] ||
> 233             !tb[IFLA_BRIDGE_VLAN_TUNNEL_VID])
> 234                 return -EINVAL;
> 
> Colin
> 

Good catch, these should go after the parsing.