netdev - Re: [PATCH 3/3] netfilter: xt_CT: remove a compile warning

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Message-Id: <201204032328.CDE78687.tQOHSLVFOFMJOF@I-love.SAKURA.ne.jp>
Date:	Tue, 3 Apr 2012 23:28:50 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	pablo@...filter.org
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 3/3] netfilter: xt_CT: remove a compile warning

Pablo Neira Ayuso wrote:
> A bit better patch, no need to hold rcu_read_lock again in
> xt_ct_tg_timeout_put (even if that doesn't harm).

Patch looks OK.

By the way,

665 static struct nf_conn *
666 __nf_conntrack_alloc(struct net *net, u16 zone,
667                      const struct nf_conntrack_tuple *orig,
668                      const struct nf_conntrack_tuple *repl,
669                      gfp_t gfp, u32 hash)
670 {
(...snipped...)
680         atomic_inc(&net->ct.count);
(...snipped...)
698         ct = kmem_cache_alloc(net->ct.nf_conntrack_cachep, gfp);
699         if (ct == NULL) {
700                 atomic_dec(&net->ct.count);
701                 return ERR_PTR(-ENOMEM);
702         }
(...snipped...)
720         if (zone) {
721                 struct nf_conntrack_zone *nf_ct_zone;
722 
723                 nf_ct_zone = nf_ct_ext_add(ct, NF_CT_EXT_ZONE, GFP_ATOMIC);
724                 if (!nf_ct_zone)
725                         goto out_free;
726                 nf_ct_zone->id = zone;
727         }
(...snipped...)
737 out_free:

I think we want to call atomic_dec() here.

738         kmem_cache_free(net->ct.nf_conntrack_cachep, ct);
739         return ERR_PTR(-ENOMEM);
740 #endif
741 }
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