Re: [dpdk-dev] [PATCH] net/txgbe: fix null pointer check problem

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 4/25/2021 1:54 PM, Min Hu (Connor) wrote:
> From: HongBo Zheng <zhenghongbo3@huawei.com>
> 
> In function cons_parse_ntuple_filter, item->spec and item->mask
> should be confirmed not null before use memcmp on it, current
> judgement (item->spec || item->mask) just can confirm item->spec
> or item->mask is not null, and cause null pointer be used in
> memcmp.
> 
> This patch fix this problem.
> 
> Fixes: b7eeecb17556 ("net/txgbe: parse n-tuple filter")
> Cc: stable@dpdk.org
> 
> Signed-off-by: HongBo Zheng <zhenghongbo3@huawei.com>
> Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
> ---
>  drivers/net/txgbe/txgbe_flow.c | 18 ++++++++----------
>  1 file changed, 8 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/net/txgbe/txgbe_flow.c b/drivers/net/txgbe/txgbe_flow.c
> index 57a4f2e..35026ee 100644
> --- a/drivers/net/txgbe/txgbe_flow.c
> +++ b/drivers/net/txgbe/txgbe_flow.c
> @@ -240,11 +240,10 @@ cons_parse_ntuple_filter(const struct rte_flow_attr *attr,
>  			return -rte_errno;
>  		}
>  		/* if the first item is MAC, the content should be NULL */
> -		if ((item->spec || item->mask) &&
> -			(memcmp(eth_spec, &eth_null,
> -				sizeof(struct rte_flow_item_eth)) ||
> -			 memcmp(eth_mask, &eth_null,
> -				sizeof(struct rte_flow_item_eth)))) {
> +		if ((item->spec && memcmp(eth_spec, &eth_null,
> +					  sizeof(struct rte_flow_item_eth))) ||
> +		    (item->mask && memcmp(eth_mask, &eth_null,
> +					  sizeof(struct rte_flow_item_eth)))) {
>  			rte_flow_error_set(error, EINVAL,
>  				RTE_FLOW_ERROR_TYPE_ITEM,
>  				item, "Not supported by ntuple filter");
> @@ -272,11 +271,10 @@ cons_parse_ntuple_filter(const struct rte_flow_attr *attr,
>  			return -rte_errno;
>  		}
>  		/* the content should be NULL */
> -		if ((item->spec || item->mask) &&
> -			(memcmp(vlan_spec, &vlan_null,
> -				sizeof(struct rte_flow_item_vlan)) ||
> -			 memcmp(vlan_mask, &vlan_null,
> -				sizeof(struct rte_flow_item_vlan)))) {
> +		if ((item->spec && memcmp(vlan_spec, &vlan_null,
> +					  sizeof(struct rte_flow_item_vlan))) ||
> +		    (item->mask && memcmp(vlan_mask, &vlan_null,
> +					  sizeof(struct rte_flow_item_vlan)))) {
>  			rte_flow_error_set(error, EINVAL,
>  				RTE_FLOW_ERROR_TYPE_ITEM,
>  				item, "Not supported by ntuple filter");
> 

Looks good to me, but lets wait or maintainers review.