netdev - Re: [PATCH net] sctp: fix overrun in sctp_diag_dump

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Date:   Tue, 23 Aug 2016 14:30:49 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Lance Richardson <lrichard@...hat.com>
Cc:     netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        Xin Long <lucien.xin@...il.com>
Subject: Re: [PATCH net] sctp: fix overrun in sctp_diag_dump_one()

On Tue, Aug 23, 2016 at 11:40:52AM -0400, Lance Richardson wrote:
> The function sctp_diag_dump_one() currently performs a memcpy()
> of 64 bytes from a 16 byte field into another 16 byte field. Fix
> by using correct size, use sizeof to obtain correct size instead
> of using a hard-coded constant.
> 
> Fixes: 8f840e47f190 ("sctp: add the sctp_diag.c file")
> Signed-off-by: Lance Richardson <lrichard@...hat.com>

Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>

Dave, please consider it to -stable.
Thanks!

> ---
>  net/sctp/sctp_diag.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/net/sctp/sctp_diag.c b/net/sctp/sctp_diag.c
> index bb69153..f3508aa 100644
> --- a/net/sctp/sctp_diag.c
> +++ b/net/sctp/sctp_diag.c
> @@ -424,11 +424,13 @@ static int sctp_diag_dump_one(struct sk_buff *in_skb,
>  		paddr.v4.sin_family = AF_INET;
>  	} else {
>  		laddr.v6.sin6_port = req->id.idiag_sport;
> -		memcpy(&laddr.v6.sin6_addr, req->id.idiag_src, 64);
> +		memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
> +		       sizeof(laddr.v6.sin6_addr));
>  		laddr.v6.sin6_family = AF_INET6;
>  
>  		paddr.v6.sin6_port = req->id.idiag_dport;
> -		memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst, 64);
> +		memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
> +		       sizeof(paddr.v6.sin6_addr));
>  		paddr.v6.sin6_family = AF_INET6;
>  	}
>  
> -- 
> 2.5.5
>