netdev - Re: [Patch net] sit: use __GFP_NOWARN for user controlled allocation

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Date:   Fri, 23 Jun 2017 14:22:24 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     netdev <netdev@...r.kernel.org>
Subject: Re: [Patch net] sit: use __GFP_NOWARN for user controlled allocation

On Fri, Jun 23, 2017 at 2:21 PM, Andrey Konovalov <andreyknvl@...gle.com> wrote:
> On Fri, Jun 23, 2017 at 12:29 AM, Cong Wang <xiyou.wangcong@...il.com> wrote:
>> The memory allocation size is controlled by user-space,
>> if it is too large just fail silently and return NULL,
>> not to mention there is a fallback allocation later.
>
> Thanks!
>
> Tested-by: Andrey Konovalov <andreyknvl.com>

Should be:
Tested-by: Andrey Konovalov <andreyknvl@...gle.com>

>
>>
>> Reported-by: Andrey Konovalov <andreyknvl@...gle.com>
>> Cc: Andrey Konovalov <andreyknvl@...gle.com>
>> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
>> ---
>>  net/ipv6/sit.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
>> index 2378503..f8ad158 100644
>> --- a/net/ipv6/sit.c
>> +++ b/net/ipv6/sit.c
>> @@ -305,7 +305,7 @@ static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
>>          * we try harder to allocate.
>>          */
>>         kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
>> -               kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
>> +               kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) :
>>                 NULL;
>>
>>         rcu_read_lock();
>> --
>> 2.5.5
>>