linux-kernel - Is this an out-of-bounds issue?

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Message-ID: <ZuQ6aCn7QlVymj62@iZbp1asjb3cy8ks0srf007Z>
Date: Fri, 13 Sep 2024 21:13:12 +0800
From: Qianqiang Liu <qianqiang.liu@....com>
To: junfeng.guo@...el.com
Cc: anthony.l.nguyen@...el.com, przemyslaw.kitszel@...el.com,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Is this an out-of-bounds issue?

The code in drivers/net/ethernet/intel/ice/ice_parser_rt.c:

114 static void ice_bst_key_init(struct ice_parser_rt *rt,
115                              struct ice_imem_item *imem)
116 {
117         u8 tsr = (u8)rt->gpr[ICE_GPR_TSR_IDX];
118         u16 ho = rt->gpr[ICE_GPR_HO_IDX];
119         u8 *key = rt->bst_key;
120         int idd, i;
121
122         idd = ICE_BST_TCAM_KEY_SIZE - 1;
123         if (imem->b_kb.tsr_ctrl)
124                 key[idd] = tsr;
125         else
126                 key[idd] = imem->b_kb.prio;

The "ICE_BST_TCAM_KEY_SIZE" macro is 20, so "idd" is 20 - 1 = 19.
"key" equals "rt->bst_key" which is an array, and the size of the
array is ICE_BST_KEY_SIZE which is 10.
Is it possible that 'key[idd]' might access invalid memory?
Should the "idd" be "ICE_BST_KEY_SIZE"?

-	idd = ICE_BST_TCAM_KEY_SIZE - 1;
+	idd = ICE_BST_KEY_SIZE - 1;

-- 
Best,
Qianqiang Liu