linux-kernel - [PATCH net] net: ethernet: mtk_eth_soc: fix memory leak in LRO rings release

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Message-ID: <20240811184949.2799-1-eladwf@gmail.com>
Date: Sun, 11 Aug 2024 21:49:45 +0300
From: Elad Yifee <eladwf@...il.com>
To: 
Cc: eladwf@...il.com,
	daniel@...rotopia.org,
	Felix Fietkau <nbd@....name>,
	Sean Wang <sean.wang@...iatek.com>,
	Mark Lee <Mark-MC.Lee@...iatek.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Chen Lin <chen45464546@....com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: [PATCH net] net: ethernet: mtk_eth_soc: fix memory leak in LRO rings release

For LRO we allocate more than one page, yet 'skb_free_frag' is used
to free the buffer, which only frees a single page.
Fix it by using 'free_pages' instead.

Fixes: 2f2c0d2919a1 ("net: ethernet: mtk_eth_soc: fix misuse of mem alloc interface netdev[napi]_alloc_frag")
 
Signed-off-by: Elad Yifee <eladwf@...il.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 16ca427cf4c3..bac6d0c48d21 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1762,8 +1762,10 @@ static void mtk_rx_put_buff(struct mtk_rx_ring *ring, void *data, bool napi)
 	if (ring->page_pool)
 		page_pool_put_full_page(ring->page_pool,
 					virt_to_head_page(data), napi);
-	else
+	else if (ring->frag_size <= PAGE_SIZE)
 		skb_free_frag(data);
+	else
+		free_pages(data, get_order(mtk_max_frag_size(ring->frag_size)));
 }
 
 static int mtk_xdp_frame_map(struct mtk_eth *eth, struct net_device *dev,
@@ -2132,7 +2134,7 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 				ring->buf_size, DMA_FROM_DEVICE);
 			if (unlikely(dma_mapping_error(eth->dma_dev,
 						       dma_addr))) {
-				skb_free_frag(new_data);
+				mtk_rx_put_buff(ring, new_data, true);
 				netdev->stats.rx_dropped++;
 				goto release_desc;
 			}
@@ -2146,7 +2148,7 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 			skb = build_skb(data, ring->frag_size);
 			if (unlikely(!skb)) {
 				netdev->stats.rx_dropped++;
-				skb_free_frag(data);
+				mtk_rx_put_buff(ring, data, true);
 				goto skip_rx;
 			}
 
@@ -2691,7 +2693,7 @@ static int mtk_rx_alloc(struct mtk_eth *eth, int ring_no, int rx_flag)
 				ring->buf_size, DMA_FROM_DEVICE);
 			if (unlikely(dma_mapping_error(eth->dma_dev,
 						       dma_addr))) {
-				skb_free_frag(data);
+				mtk_rx_put_buff(ring, data, false);
 				return -ENOMEM;
 			}
 		}
-- 
2.45.2