netdev - Re: [PATCH net-next] nfnetlink_queue: enable PID info retrieval

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Message-ID: <1465507031.7945.44.camel@edumazet-glaptop3.roam.corp.google.com>
Date:	Thu, 09 Jun 2016 14:17:11 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Saeed Mahameed <saeedm@...lanox.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org,
	Yevgeny Petrilin <yevgenyp@...lanox.com>,
	Andre Melkoumian <andre@...lanox.com>,
	Matthew Finlay <matt@...lanox.com>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>
Subject: Re: [PATCH net-next] nfnetlink_queue: enable PID info retrieval

On Thu, 2016-06-09 at 23:50 +0300, Saeed Mahameed wrote:
> From: Matthew Finlay <matt@...lanox.com>


> diff --git a/net/socket.c b/net/socket.c
> index a1bd161..67de200 100644
> --- a/net/socket.c
> +++ b/net/socket.c
> @@ -382,6 +382,7 @@ struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
>  	}
>  
>  	sock->file = file;
> +	file->f_owner.sock_pid  = find_get_pid(task_pid_nr(current));
>  	file->f_flags = O_RDWR | (flags & O_NONBLOCK);
>  	file->private_data = sock;
>  	return file;

Wow, that is a serious memory leak weapon (of struct pid)

Why don't you store the pid value, instead of a pointer ?