RE: [PATCH v3] net/ice: fix raw flow input pattern value change in FDIR

["Zhang, Qi Z" <qi.z.zhang@intel.com>]

> -----Original Message-----
> From: Xu, Ting <ting.xu@intel.com>
> Sent: Monday, April 18, 2022 2:59 PM
> To: dev@dpdk.org
> Cc: Guo, Junfeng <junfeng.guo@intel.com>; Xu, Ting <ting.xu@intel.com>;
> stable@dpdk.org; Yang, Qiming <qiming.yang@intel.com>; Zhang, Qi Z
> <qi.z.zhang@intel.com>
> Subject: [PATCH v3] net/ice: fix raw flow input pattern value change in FDIR
> 
> When parsing raw flow pattern in FDIR, the input parameter spec and mask
> are used directly and the original value will be changed. It will cause error if
> these values are used in other functions. In this patch, temporary variables
> are created to store the spec and mask.
> 
> Fixes: 25be39cc1760 ("net/ice: enable protocol agnostic flow offloading in
> FDIR")
> 
> Cc: stable@dpdk.org
> 
> Signed-off-by: Ting Xu <ting.xu@intel.com>
> ---
>  drivers/net/ice/ice_fdir_filter.c | 25 +++++++++++++++++++------
>  1 file changed, 19 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ice/ice_fdir_filter.c b/drivers/net/ice/ice_fdir_filter.c
> index 0982478feb..7914ba9407 100644
> --- a/drivers/net/ice/ice_fdir_filter.c
> +++ b/drivers/net/ice/ice_fdir_filter.c
> @@ -1870,10 +1870,11 @@ ice_fdir_parse_pattern(__rte_unused struct
> ice_adapter *ad,
>  				break;
> 
>  			/* convert raw spec & mask from byte string to int */
> -			unsigned char *tmp_spec =
> +			unsigned char *spec_pattern =
>  				(uint8_t *)(uintptr_t)raw_spec->pattern;
> -			unsigned char *tmp_mask =
> +			unsigned char *mask_pattern =
>  				(uint8_t *)(uintptr_t)raw_mask->pattern;
> +			uint8_t *tmp_spec, *tmp_mask;
>  			uint16_t tmp_val = 0;
>  			uint8_t pkt_len = 0;
>  			uint8_t tmp = 0;
> @@ -1884,8 +1885,18 @@ ice_fdir_parse_pattern(__rte_unused struct
> ice_adapter *ad,
>  				pkt_len)
>  				return -rte_errno;
> 
> +			tmp_spec = rte_zmalloc(NULL, pkt_len / 2, 0);
> +			if (!tmp_spec)
> +				return -rte_errno;
> +
> +			tmp_mask = rte_zmalloc(NULL, pkt_len / 2, 0);
> +			if (!tmp_mask) {
> +				rte_free(tmp_spec);
> +				return -rte_errno;
> +			}
> +
>  			for (i = 0, j = 0; i < pkt_len; i += 2, j++) {
> -				tmp = tmp_spec[i];
> +				tmp = spec_pattern[i];
>  				if (tmp >= 'a' && tmp <= 'f')
>  					tmp_val = tmp - 'a' + 10;
>  				if (tmp >= 'A' && tmp <= 'F')
> @@ -1894,7 +1905,7 @@ ice_fdir_parse_pattern(__rte_unused struct
> ice_adapter *ad,
>  					tmp_val = tmp - '0';
> 
>  				tmp_val *= 16;
> -				tmp = tmp_spec[i + 1];
> +				tmp = spec_pattern[i + 1];
>  				if (tmp >= 'a' && tmp <= 'f')
>  					tmp_spec[j] = tmp_val + tmp - 'a' + 10;
>  				if (tmp >= 'A' && tmp <= 'F')
> @@ -1902,7 +1913,7 @@ ice_fdir_parse_pattern(__rte_unused struct
> ice_adapter *ad,
>  				if (tmp >= '0' && tmp <= '9')
>  					tmp_spec[j] = tmp_val + tmp - '0';
> 
> -				tmp = tmp_mask[i];
> +				tmp = mask_pattern[i];
>  				if (tmp >= 'a' && tmp <= 'f')
>  					tmp_val = tmp - 'a' + 10;
>  				if (tmp >= 'A' && tmp <= 'F')
> @@ -1911,7 +1922,7 @@ ice_fdir_parse_pattern(__rte_unused struct
> ice_adapter *ad,
>  					tmp_val = tmp - '0';
> 
>  				tmp_val *= 16;
> -				tmp = tmp_mask[i + 1];
> +				tmp = mask_pattern[i + 1];
>  				if (tmp >= 'a' && tmp <= 'f')
>  					tmp_mask[j] = tmp_val + tmp - 'a' + 10;
>  				if (tmp >= 'A' && tmp <= 'F')
> @@ -1947,6 +1958,8 @@ ice_fdir_parse_pattern(__rte_unused struct
> ice_adapter *ad,
> 
>  			filter->parser_ena = true;
> 
> +			rte_free(tmp_spec);
> +			rte_free(tmp_mask);
>  			break;
>  		}
> 
> --
> 2.17.1

Added
Acked-by: Junfeng Guo <junfeng.guo@intel.com> from V2

Applied to dpdk-next-net-intel.

Thanks
Qi