netdev - Re: [PATCH v3 net-next 1/3] ipv4: Move cached routes to fib_nh

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Date:   Tue, 30 Apr 2019 08:27:23 -0600
From:   David Ahern <dsahern@...il.com>
To:     Ido Schimmel <idosch@...lanox.com>,
        David Ahern <dsahern@...nel.org>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 net-next 1/3] ipv4: Move cached routes to fib_nh_common

On 4/30/19 12:40 AM, Ido Schimmel wrote:
> On Mon, Apr 29, 2019 at 09:16:17AM -0700, David Ahern wrote:
>>  /* Release a nexthop info record */
>> @@ -491,9 +491,15 @@ int fib_nh_common_init(struct fib_nh_common *nhc, struct nlattr *encap,
>>  		       u16 encap_type, void *cfg, gfp_t gfp_flags,
>>  		       struct netlink_ext_ack *extack)
>>  {
>> +	int err;
>> +
>> +	nhc->nhc_pcpu_rth_output = alloc_percpu_gfp(struct rtable __rcu *,
>> +						    gfp_flags);
>> +	if (!nhc->nhc_pcpu_rth_output)
>> +		return -ENOMEM;
>> +
>>  	if (encap) {
>>  		struct lwtunnel_state *lwtstate;
>> -		int err;
>>  
>>  		if (encap_type == LWTUNNEL_ENCAP_NONE) {
>>  			NL_SET_ERR_MSG(extack, "LWT encap type not specified");
> 
> Failure here will leak 'nhc->nhc_pcpu_rth_output'
> 

ugh, thanks for catching that.