Re: [PATCH] netfilter: ipset: fix uninitialized variable bug

[Jozsef Kadlecsik <kadlec@netfilter.org>]

Hi Dan,

On Wed, 4 Aug 2021, Dan Carpenter wrote:

> This condition doesn't work because "port_to" is not initialized until
> the next line.  Move the condition down.

You are right - Nathan Chancellor already sent the same fix and I acked 
it. Thanks!

Best regards,
Jozsef
 
> Fixes: 7fb6c63025ff ("netfilter: ipset: Limit the maximal range of consecutive elements to add/delete")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
>  net/netfilter/ipset/ip_set_hash_ipportnet.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/net/netfilter/ipset/ip_set_hash_ipportnet.c b/net/netfilter/ipset/ip_set_hash_ipportnet.c
> index b293aa1ff258..7df94f437f60 100644
> --- a/net/netfilter/ipset/ip_set_hash_ipportnet.c
> +++ b/net/netfilter/ipset/ip_set_hash_ipportnet.c
> @@ -246,9 +246,6 @@ hash_ipportnet4_uadt(struct ip_set *set, struct nlattr *tb[],
>  		ip_set_mask_from_to(ip, ip_to, cidr);
>  	}
>  
> -	if (((u64)ip_to - ip + 1)*(port_to - port + 1) > IPSET_MAX_RANGE)
> -		return -ERANGE;
> -
>  	port_to = port = ntohs(e.port);
>  	if (tb[IPSET_ATTR_PORT_TO]) {
>  		port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
> @@ -256,6 +253,9 @@ hash_ipportnet4_uadt(struct ip_set *set, struct nlattr *tb[],
>  			swap(port, port_to);
>  	}
>  
> +	if (((u64)ip_to - ip + 1)*(port_to - port + 1) > IPSET_MAX_RANGE)
> +		return -ERANGE;
> +
>  	ip2_to = ip2_from;
>  	if (tb[IPSET_ATTR_IP2_TO]) {
>  		ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2_TO], &ip2_to);
> -- 
> 2.20.1
> 
> 

-
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