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

[ Upstream commit f27b405 ] 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: c4f033d ("net: ethernet: mtk_eth_soc: rework hardware flow table management") Signed-off-by: Lorenzo Bianconi <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Sasha Levin <[email protected]>
starfive-tech · Sep 15, 2022 · e484616 · e484616
1 parent 0378b06
commit e484616
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.h b/drivers/net/ethernet/mediatek/mtk_ppe.h
@@ -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)