netdev - [PATCH net] net: airoha: Fix NULL pointer dereference in airoha_qdma_cleanup_rx

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Message-ID: <7330a41bba720c33abc039955f6172457a3a34f0.1721205981.git.lorenzo@kernel.org>
Date: Wed, 17 Jul 2024 10:47:19 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: netdev@...r.kernel.org
Cc: nbd@....name,
	sean.wang@...iatek.com,
	Mark-MC.Lee@...iatek.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	angelogioacchino.delregno@...labora.com,
	lorenzo.bianconi83@...il.com
Subject: [PATCH net] net: airoha: Fix NULL pointer dereference in airoha_qdma_cleanup_rx_queue()

Move page_pool_get_dma_dir() inside the while loop of
airoha_qdma_cleanup_rx_queue routine in order to avoid possible NULL
pointer dereference if airoha_qdma_init_rx_queue() fails before
properly allocating the page_pool pointer.

Fixes: 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC")
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 drivers/net/ethernet/mediatek/airoha_eth.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/airoha_eth.c b/drivers/net/ethernet/mediatek/airoha_eth.c
index cc1a69522f61..16761fde6c6c 100644
--- a/drivers/net/ethernet/mediatek/airoha_eth.c
+++ b/drivers/net/ethernet/mediatek/airoha_eth.c
@@ -1585,7 +1585,6 @@ static int airoha_qdma_init_rx_queue(struct airoha_eth *eth,
 
 static void airoha_qdma_cleanup_rx_queue(struct airoha_queue *q)
 {
-	enum dma_data_direction dir = page_pool_get_dma_dir(q->page_pool);
 	struct airoha_eth *eth = q->eth;
 
 	while (q->queued) {
@@ -1593,7 +1592,7 @@ static void airoha_qdma_cleanup_rx_queue(struct airoha_queue *q)
 		struct page *page = virt_to_head_page(e->buf);
 
 		dma_sync_single_for_cpu(eth->dev, e->dma_addr, e->dma_len,
-					dir);
+					page_pool_get_dma_dir(q->page_pool));
 		page_pool_put_full_page(q->page_pool, page, false);
 		q->tail = (q->tail + 1) % q->ndesc;
 		q->queued--;
-- 
2.45.2