netdev - Re: [PATCH iwl-next v8 12/15] ice: add parser execution main loop

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Date: Thu, 24 Aug 2023 17:39:01 +0200
From: Simon Horman <horms@...nel.org>
To: Junfeng Guo <junfeng.guo@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	anthony.l.nguyen@...el.com, jesse.brandeburg@...el.com,
	qi.z.zhang@...el.com, ivecera@...hat.com,
	sridhar.samudrala@...el.com, kuba@...nel.org, edumazet@...gle.com,
	davem@...emloft.net, pabeni@...hat.com
Subject: Re: [PATCH iwl-next v8 12/15] ice: add parser execution main loop

On Thu, Aug 24, 2023 at 03:54:57PM +0800, Junfeng Guo wrote:
> Implement function ice_parser_rt_execute which perform the main
> loop of the parser.
> 
> Also include the Parser Library files into ice Makefile.
> 
> Signed-off-by: Junfeng Guo <junfeng.guo@...el.com>

...

> @@ -80,6 +107,632 @@ void ice_parser_rt_pktbuf_set(struct ice_parser_rt *rt, const u8 *pkt_buf,
>  	memcpy(&rt->gpr[ICE_GPR_HV_IDX], &rt->pkt_buf[ho], ICE_GPR_HV_SIZE);
>  }
>  
> +static void _ice_bst_key_init(struct ice_parser_rt *rt,
> +			      struct ice_imem_item *imem)
> +{
> +	u8 tsr = (u8)rt->gpr[ICE_GPR_TSR_IDX];
> +	u16 ho = rt->gpr[ICE_GPR_HO_IDX];
> +	u8 *key = rt->bst_key;
> +	int idd, i;
> +
> +	idd = ICE_BST_TCAM_KEY_SIZE - 1;
> +	if (imem->b_kb.tsr_ctrl)
> +		key[idd] = (u8)tsr;
> +	else
> +		key[idd] = imem->b_kb.prio;
> +
> +	idd = ICE_BST_KEY_TCAM_SIZE - 1;
> +	for (i = idd; i >= 0; i--) {
> +		int j;
> +
> +		j = ho + idd - i;
> +		if (j < ICE_PARSER_MAX_PKT_LEN)
> +			key[i] = rt->pkt_buf[ho + idd - i];
> +		else
> +			key[i] = 0;
> +	}
> +
> +	ice_debug(rt->psr->hw, ICE_DBG_PARSER, "Generated Boost TCAM Key:\n");
> +	ice_debug(rt->psr->hw, ICE_DBG_PARSER, "%02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X\n",
> +		  key[0], key[1], key[2], key[3], key[4],
> +		  key[5], key[6], key[7], key[8], key[9],
> +		  key[10], key[11], key[12], key[13], key[14],
> +		  key[15], key[16], key[17], key[18], key[19]);

Hi Junfeng Guo,

key points to rt->bst_key which has ICE_BST_KEY_SIZE (10) elements.
But here 20 elements are accessed. This seems to be an overrun.

Flagged by Smatch.

> +	ice_debug(rt->psr->hw, ICE_DBG_PARSER, "\n");
> +}
> +