linux-kernel - [PATCH rtw-next] wifi: rtlwifi: fix possible skb memory leak in _rtl_pci_init_one

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Message-ID: <20250613074014.69856-2-fourier.thomas@gmail.com>
Date: Fri, 13 Jun 2025 09:38:36 +0200
From: Thomas Fourier <fourier.thomas@...il.com>
To: 
Cc: Thomas Fourier <fourier.thomas@...il.com>,
	Ping-Ke Shih <pkshih@...ltek.com>,
	linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH rtw-next] wifi: rtlwifi: fix possible skb memory leak in _rtl_pci_init_one_rxdesc()

When `dma_mapping_error()` is true, if a new `skb` has been allocated,
then it must be de-allocated.

Compile tested only

Signed-off-by: Thomas Fourier <fourier.thomas@...il.com>
---
 drivers/net/wireless/realtek/rtlwifi/pci.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c
index 898f597f70a9..472072630f8d 100644
--- a/drivers/net/wireless/realtek/rtlwifi/pci.c
+++ b/drivers/net/wireless/realtek/rtlwifi/pci.c
@@ -572,8 +572,11 @@ static int _rtl_pci_init_one_rxdesc(struct ieee80211_hw *hw,
 		dma_map_single(&rtlpci->pdev->dev, skb_tail_pointer(skb),
 			       rtlpci->rxbuffersize, DMA_FROM_DEVICE);
 	bufferaddress = *((dma_addr_t *)skb->cb);
-	if (dma_mapping_error(&rtlpci->pdev->dev, bufferaddress))
+	if (dma_mapping_error(&rtlpci->pdev->dev, bufferaddress)) {
+		if (!new_skb)
+			kfree_skb(skb);
 		return 0;
+	}
 	rtlpci->rx_ring[rxring_idx].rx_buf[desc_idx] = skb;
 	if (rtlpriv->use_new_trx_flow) {
 		/* skb->cb may be 64 bit address */
-- 
2.43.0