[PATCH 1/3] net: ethernet: bcmasp: fix possible OOB write in bcmasp_netfilt_get_all_active()

[Justin Chen]

On 9/6/23 2:21 AM, Hangyu Hua wrote:
> rule_locs is allocated in ethtool_get_rxnfc and the size is determined by
> rule_cnt from user space. So rule_cnt needs to be check before using
> rule_locs to avoid OOB writing or NULL pointer dereference.
> 
> Fixes: c5d511c49587 ("net: bcmasp: Add support for wake on net filters")
> Signed-off-by: Hangyu Hua <hbh25y at gmail.com>

Reviewed-by: Justin Chen <justin.chen at broadcom.com>

> ---
>   drivers/net/ethernet/broadcom/asp2/bcmasp.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp.c b/drivers/net/ethernet/broadcom/asp2/bcmasp.c
> index d63d321f3e7b..4df2ca871af8 100644
> --- a/drivers/net/ethernet/broadcom/asp2/bcmasp.c
> +++ b/drivers/net/ethernet/broadcom/asp2/bcmasp.c
> @@ -535,6 +535,9 @@ void bcmasp_netfilt_get_all_active(struct bcmasp_intf *intf, u32 *rule_locs,
>   	int j = 0, i;
>   
>   	for (i = 0; i < NUM_NET_FILTERS; i++) {
> +		if (j == *rule_cnt)
> +			break;
> +
>   		if (!priv->net_filters[i].claimed ||
>   		    priv->net_filters[i].port != intf->port)
>   			continue;
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