kernel: mtk_eth_soc: zero-initialize PPE flow tables

Prevents invalid flow table data from leaking across reboots

Fixes: https://github.com/openwrt/openwrt/issues/19895
Signed-off-by: Felix Fietkau <[email protected]>

diff --git a/target/linux/generic/pending-6.12/736-05-net-ethernet-mtk_eth_soc-zero-initialize-PPE-flow-ta.patch b/target/linux/generic/pending-6.12/736-05-net-ethernet-mtk_eth_soc-zero-initialize-PPE-flow-ta.patch
new file mode 100644 (file)
index 0000000..2ca5ace
--- /dev/null
+++ b/target/linux/generic/pending-6.12/736-05-net-ethernet-mtk_eth_soc-zero-initialize-PPE-flow-ta.patch
@@ -0,0 +1,27 @@
+From: Felix Fietkau <[email protected]>
+Date: Fri, 12 Sep 2025 14:18:14 +0200
+Subject: [PATCH] net: ethernet: mtk_eth_soc: zero initialize PPE flow table
+
+Avoid picking up flows from last boot or other invalid data
+
+Signed-off-by: Felix Fietkau <[email protected]>
+---
+
+--- a/drivers/net/ethernet/mediatek/mtk_ppe.c
++++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
+@@ -914,6 +914,7 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_
+       if (!foe)
+               goto err_free_l2_flows;
+ 
++      memset(foe, 0, MTK_PPE_ENTRIES * soc->foe_entry_size);
+       ppe->foe_table = foe;
+ 
+       foe_flow_size = (MTK_PPE_ENTRIES / soc->hash_offset) *
+@@ -928,6 +929,7 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_
+               if (!mib)
+                       return NULL;
+ 
++              memset(mib, 0, MTK_PPE_ENTRIES * sizeof(*mib));
+               ppe->mib_table = mib;
+ 
+               acct = devm_kzalloc(dev, MTK_PPE_ENTRIES * sizeof(*acct),

diff --git a/target/linux/generic/pending-6.6/736-05-net-ethernet-mtk_eth_soc-zero-initialize-PPE-flow-ta.patch b/target/linux/generic/pending-6.6/736-05-net-ethernet-mtk_eth_soc-zero-initialize-PPE-flow-ta.patch
new file mode 100644 (file)
index 0000000..2ca5ace
--- /dev/null
+++ b/target/linux/generic/pending-6.6/736-05-net-ethernet-mtk_eth_soc-zero-initialize-PPE-flow-ta.patch
@@ -0,0 +1,27 @@
+From: Felix Fietkau <[email protected]>
+Date: Fri, 12 Sep 2025 14:18:14 +0200
+Subject: [PATCH] net: ethernet: mtk_eth_soc: zero initialize PPE flow table
+
+Avoid picking up flows from last boot or other invalid data
+
+Signed-off-by: Felix Fietkau <[email protected]>
+---
+
+--- a/drivers/net/ethernet/mediatek/mtk_ppe.c
++++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
+@@ -914,6 +914,7 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_
+       if (!foe)
+               goto err_free_l2_flows;
+ 
++      memset(foe, 0, MTK_PPE_ENTRIES * soc->foe_entry_size);
+       ppe->foe_table = foe;
+ 
+       foe_flow_size = (MTK_PPE_ENTRIES / soc->hash_offset) *
+@@ -928,6 +929,7 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_
+               if (!mib)
+                       return NULL;
+ 
++              memset(mib, 0, MTK_PPE_ENTRIES * sizeof(*mib));
+               ppe->mib_table = mib;
+ 
+               acct = devm_kzalloc(dev, MTK_PPE_ENTRIES * sizeof(*acct),