netdev - Re: [PATCH] X.25: Fix address field length calculation

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Message-ID: <1381858190.22110.25.camel@joe-AO722>
Date:	Tue, 15 Oct 2013 10:29:50 -0700
From:	Joe Perches <joe@...ches.com>
To:	"Kelleter," Günther <GKelleter@...us.com>
Cc:	"andrew.hendry@...il.com" <andrew.hendry@...il.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"linux-x25@...r.kernel.org" <linux-x25@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] X.25: Fix address field length calculation

On Tue, 2013-10-15 at 14:29 +0000, Kelleter, Günther wrote:
> Addresses are BCD encoded, not ASCII. x25_addr_ntoa got it right.
[]
> Wrong length calculation leads to rejection of CALL ACCEPT packets.
[]
> diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
[]
> @@ -98,7 +98,7 @@ int x25_parse_address_block(struct sk_buff *skb,
>  	}
>   	len = *skb->data;
> -	needed = 1 + (len >> 4) + (len & 0x0f);
> +	needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;

This calculation looks odd.
Perhaps use bcd.h instead?


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