netdev - Re: [NET]: Fix fib_rules compatibility breakage

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Message-ID: <46001300.90804@trash.net>
Date:	Tue, 20 Mar 2007 17:59:44 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Thomas Graf <tgraf@...g.ch>
CC:	Linux Netdev List <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>, lartc@...lman.ds9a.nl
Subject: Re: [NET]: Fix fib_rules compatibility breakage

Thomas Graf wrote:
> @@ -242,10 +239,10 @@ static int fib4_rule_compare(struct fib_
>  		return 0;
>  #endif
>  
> -	if (tb[FRA_SRC] && (rule4->src != nla_get_be32(tb[FRA_SRC])))
> +	if (frh->src_len && (rule4->src != nla_get_be32(tb[FRA_SRC])))
>  		return 0;
>  
> -	if (tb[FRA_DST] && (rule4->dst != nla_get_be32(tb[FRA_DST])))
> +	if (frh->dst_len && (rule4->dst != nla_get_be32(tb[FRA_DST])))
>  		return 0;
>  

The presence of the attributes when src_len/dst_len is non-zero
is only verified in fib_newrule, so this looks like it might crash
when something broken sets src_len/dst_len to a non-zero value
without actually adding the attributes.

Other than that it looks fine.
-
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