netdev - Re: [PATCH iproute2] ss: avoid passing negative numbers to malloc

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Date:	Tue, 12 Nov 2013 15:18:47 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andreas Henriksson <andreas@...al.se>
Cc:	stephen@...workplumber.org, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2] ss: avoid passing negative numbers to malloc

On Tue, 2013-11-12 at 19:52 +0100, Andreas Henriksson wrote:
> Example:
> 
> $ ss state established \( sport = :4060  or sport = :4061 or sport = :4062  or sport = :4063 or sport = :4064  or sport = :4065 or sport = :4066  or sport = :4067 \)  > /dev/null
> Aborted
> 
> In the example above ssfilter_bytecompile(...) will return (int)136.
> char l1 = 136; means -120 which will result in a negative number
> being passed to malloc at misc/ss.c:913.
> 
> Simply declare l1 and l2 as intergers to avoid the char overflow.
> 
> This is one of the issues originally reported in http://bugs.debian.org/511720
> 
> Reported-by: Andreas Schuldei <andreas@...ian.org>
> Signed-off-by: Andreas Henriksson <andreas@...al.se>
> ---
>  misc/ss.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/misc/ss.c b/misc/ss.c
> index c0369f1..db3a3a4 100644
> --- a/misc/ss.c
> +++ b/misc/ss.c
> @@ -907,7 +907,8 @@ static int ssfilter_bytecompile(struct ssfilter *f, char **bytecode)
>  	}
>  		case SSF_OR:
>  	{
> -		char *a1, *a2, *a, l1, l2;
> +		char *a1, *a2, *a;
> +		int l1, l2;
>  		l1 = ssfilter_bytecompile(f->pred, &a1);
>  		l2 = ssfilter_bytecompile(f->post, &a2);
>  		if (!(a = malloc(l1+l2+4))) abort();

Please fix the other cases (SSF_NOT and SSF_AND) ?

Thanks !


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