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net: ethernet: mtk_eth_soc: check max allowed hash in mtk_ppe_check_skb

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Even if max hash configured in hw in mtk_ppe_hash_entry is
MTK_PPE_ENTRIES - 1, check theoretical OOB accesses in
mtk_ppe_check_skb routine

Fixes: c4f033d9e0 ("net: ethernet: mtk_eth_soc: rework hardware flow table management")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lorenzo Bianconi 2022-09-05 14:41:28 +02:00 committed by David S. Miller
parent 9cb252c4c1
commit f27b405ef4
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/mediatek/mtk_ppe.h
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@ -293,6 +293,9 @@ mtk_ppe_check_skb(struct mtk_ppe *ppe, struct sk_buff *skb, u16 hash)
if (!ppe)
return;
if (hash > MTK_PPE_HASH_MASK)
return;
now = (u16)jiffies;
diff = now - ppe->foe_check_time[hash];
if (diff < HZ / 10)