netdev - Re: [PATCH v3] audit: fix memory leak in nf_tables

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Message-ID: <20210717002243.GA27401@salvia>
Date:   Sat, 17 Jul 2021 02:22:43 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Dongliang Mu <mudongliangabcd@...il.com>
Cc:     Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Richard Guy Briggs <rgb@...hat.com>,
        Paul Moore <paul@...l-moore.com>,
        syzbot <syzkaller@...glegroups.com>,
        kernel test robot <lkp@...el.com>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] audit: fix memory leak in nf_tables_commit

On Wed, Jul 14, 2021 at 11:27:03AM +0800, Dongliang Mu wrote:
> In nf_tables_commit, if nf_tables_commit_audit_alloc fails, it does not
> free the adp variable.
> 
> Fix this by adding nf_tables_commit_audit_free which frees 
> the linked list with the head node adl.
> 
> backtrace:
>   kmalloc include/linux/slab.h:591 [inline]
>   kzalloc include/linux/slab.h:721 [inline]
>   nf_tables_commit_audit_alloc net/netfilter/nf_tables_api.c:8439 [inline]
>   nf_tables_commit+0x16e/0x1760 net/netfilter/nf_tables_api.c:8508
>   nfnetlink_rcv_batch+0x512/0xa80 net/netfilter/nfnetlink.c:562
>   nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:634 [inline]
>   nfnetlink_rcv+0x1fa/0x220 net/netfilter/nfnetlink.c:652
>   netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
>   netlink_unicast+0x2c7/0x3e0 net/netlink/af_netlink.c:1340
>   netlink_sendmsg+0x36b/0x6b0 net/netlink/af_netlink.c:1929
>   sock_sendmsg_nosec net/socket.c:702 [inline]
>   sock_sendmsg+0x56/0x80 net/socket.c:722

Applied, thanks.