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

From: Florian Westphal <[email-masked]>
Date: Thu, 9 Jun 2016 23:35:17 +0200

Saeed Mahameed <[email-masked]> wrote:
> 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;

This looks like this leaks sock_pid reference...?

(find_get_pid -> get_pid -> atomic_inc() , I don't see a put_pid in the
 patch)

Can't comment further than this since I'm not familiar with vfs; e.g.
I can't say if fown_struct is right place or not, or if this approach
even works when creating process has exited after fork, etc.