linux-kernel - Re: [PATCH] tipc: fix an infoleak in tipc_nl_compat_link

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Date:	Wed, 01 Jun 2016 23:32:16 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	kangjielu@...il.com
Cc:	jon.maloy@...csson.com, ying.xue@...driver.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	taesoo@...ech.edu, csong84@...ech.edu, kjlu@...ech.edu
Subject: Re: [PATCH] tipc: fix an infoleak in tipc_nl_compat_link_dump

From: Kangjie Lu <kangjielu@...il.com>
Date: Wed,  1 Jun 2016 12:34:55 -0400

> diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c
> index f795b1d..115aafa 100644
> --- a/net/tipc/netlink_compat.c
> +++ b/net/tipc/netlink_compat.c
> @@ -604,6 +604,7 @@ static int tipc_nl_compat_link_dump(struct tipc_nl_compat_msg *msg,
>  
>  	link_info.dest = nla_get_flag(link[TIPC_NLA_LINK_DEST]);
>  	link_info.up = htonl(nla_get_flag(link[TIPC_NLA_LINK_UP]));
> +	memset((void *)link_info.str, 0, TIPC_MAX_LINK_NAME);
>  	strcpy(link_info.str, nla_data(link[TIPC_NLA_LINK_NAME]));
>  

Please instead use "nla_strlcpy()".

Thanks.