netdev - [PATCH] net: ethernet: mtk_eth_soc: fix memory leak in mtk_ppe

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Date:   Sun, 13 Nov 2022 07:32:39 +0800
From:   Yan Cangang <nalanzeyu@...il.com>
To:     nbd@....name, john@...ozen.org, sean.wang@...iatek.com,
        Mark-MC.Lee@...iatek.com
Cc:     netdev@...r.kernel.org, Yan Cangang <nalanzeyu@...il.com>
Subject: [PATCH] net: ethernet: mtk_eth_soc: fix memory leak in mtk_ppe_init()

    When dmam_alloc_coherent() or devm_kzalloc() failed, the rhashtable
    ppe->l2_flows isn't destroyed. Fix it.

Fixes: 33fc42de3327 ("net: ethernet: mtk_eth_soc: support creating mac address based offload entries")
Signed-off-by: Yan Cangang <nalanzeyu@...il.com>
---
 drivers/net/ethernet/mediatek/mtk_ppe.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.c b/drivers/net/ethernet/mediatek/mtk_ppe.c
index 2d8ca99f2467..8da4c8be59fd 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
@@ -737,7 +737,7 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_eth *eth, void __iomem *base,
 				  MTK_PPE_ENTRIES * soc->foe_entry_size,
 				  &ppe->foe_phys, GFP_KERNEL);
 	if (!foe)
-		return NULL;
+		goto err_free_l2_flows;
 
 	ppe->foe_table = foe;
 
@@ -745,11 +745,15 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_eth *eth, void __iomem *base,
 			sizeof(*ppe->foe_flow);
 	ppe->foe_flow = devm_kzalloc(dev, foe_flow_size, GFP_KERNEL);
 	if (!ppe->foe_flow)
-		return NULL;
+		goto err_free_l2_flows;
 
 	mtk_ppe_debugfs_init(ppe, index);
 
 	return ppe;
+
+err_free_l2_flows:
+	rhashtable_destroy(&ppe->l2_flows);
+	return NULL;
 }
 
 static void mtk_ppe_init_foe_table(struct mtk_ppe *ppe)
-- 
2.30.2