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From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Tue, 12 Apr 2022 12:24:19 +0300
Subject: [PATCH] net: ethernet: mtk_eth_soc: use after free in
__mtk_ppe_check_skb()
The __mtk_foe_entry_clear() function frees "entry" so we have to use
the _safe() version of hlist_for_each_entry() to prevent a use after
free.
Fixes: 33fc42de3327 ("net: ethernet: mtk_eth_soc: support creating mac address based offload entries")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
--- a/drivers/net/ethernet/mediatek/mtk_ppe.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
@@ -600,6 +600,7 @@ void __mtk_ppe_check_skb(struct mtk_ppe
struct mtk_foe_entry *hwe = &ppe->foe_table[hash];
struct mtk_flow_entry *entry;
struct mtk_foe_bridge key = {};
+ struct hlist_node *n;
struct ethhdr *eh;
bool found = false;
u8 *tag;
@@ -609,7 +610,7 @@ void __mtk_ppe_check_skb(struct mtk_ppe
if (FIELD_GET(MTK_FOE_IB1_STATE, hwe->ib1) == MTK_FOE_STATE_BIND)
goto out;
- hlist_for_each_entry(entry, head, list) {
+ hlist_for_each_entry_safe(entry, n, head, list) {
if (entry->type == MTK_FLOW_TYPE_L2_SUBFLOW) {
if (unlikely(FIELD_GET(MTK_FOE_IB1_STATE, hwe->ib1) ==
MTK_FOE_STATE_BIND))
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