linux-kernel - Re: [PATCH] net: netfilter: fix GCC uninitialized warning

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Message-ID: <CAJwJo6Ybv9pXSFJqxtPR=W0+6JDfh8M7DtFQYV6VnuWjjWpTNA@mail.gmail.com>
Date:	Fri, 6 Nov 2015 22:13:16 +0300
From:	Dmitry Safonov <0x7f454c46@...il.com>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	Patrick McHardy <kaber@...sh.net>, kadlec@...ckhole.kfki.hu,
	davem@...emloft.net, netfilter-devel@...r.kernel.org,
	coreteam@...filter.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: netfilter: fix GCC uninitialized warning

I thought, it was decided to use 0/NULL/whatever, than uninitialized_var()?
Is right now?
http://thread.gmane.org/gmane.linux.kernel/1383415

2015-11-06 22:10 GMT+03:00 Pablo Neira Ayuso <pablo@...filter.org>:
> On Fri, Nov 06, 2015 at 09:48:14PM +0300, Dmitry Safonov wrote:
>> With x86_64_defconfig:
>> GCC thinks that in nfulnl_recv_config flags parameter is not inited but
>> it was under the same condition (nfula[NFULA_CFG_FLAGS] == true).
>> Suppress this warning:
>>       net/netfilter/nfnetlink_log.c: In function ‘nfulnl_recv_config’:
>>       net/netfilter/nfnetlink_log.c:320:14: warning: ‘flags’ may be used uninitialized in this function [-Wmaybe-uninitialized]
>>       inst->flags = flags;
>>                   ^
>> Signed-off-by: Dmitry Safonov <0x7f454c46@...il.com>
>> ---
>>  net/netfilter/nfnetlink_log.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
>> index 06eb48fceb42e4..d65f3b987b7f13 100644
>> --- a/net/netfilter/nfnetlink_log.c
>> +++ b/net/netfilter/nfnetlink_log.c
>> @@ -825,7 +825,7 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
>>       struct net *net = sock_net(ctnl);
>>       struct nfnl_log_net *log = nfnl_log_pernet(net);
>>       int ret = 0;
>> -     u16 flags;
>> +     u16 flags = 0; /* GCC uninitialized */
>
>         u16 uninitialized_var(flags); ?
>
>>       if (nfula[NFULA_CFG_CMD]) {
>>               u_int8_t pf = nfmsg->nfgen_family;
>> --
>> 2.6.2
>>
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