linux-kernel - [PATCH net] net: pch_gbe: fix potential memleak in pch_gbe_tx

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Date:   Thu, 17 Nov 2022 14:55:27 +0800
From:   Wang Hai <wanghai38@...wei.com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <andriy.shevchenko@...ux.intel.com>,
        <liuhangbin@...il.co>, <masa-korg@....okisemi.com>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: [PATCH net] net: pch_gbe: fix potential memleak in pch_gbe_tx_queue()

In pch_gbe_xmit_frame(), NETDEV_TX_OK will be returned whether
pch_gbe_tx_queue() sends data successfully or not, so pch_gbe_tx_queue()
needs to free skb before returning. But pch_gbe_tx_queue() returns without
freeing skb in case of dma_map_single() fails. Add dev_kfree_skb_any()
to fix it.

Fixes: 77555ee72282 ("net: Add Gigabit Ethernet driver of Topcliff PCH")
Signed-off-by: Wang Hai <wanghai38@...wei.com>
---
 drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
index 3f2c30184752..c9ae47128a07 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
@@ -1143,6 +1143,7 @@ static void pch_gbe_tx_queue(struct pch_gbe_adapter *adapter,
 		buffer_info->dma = 0;
 		buffer_info->time_stamp = 0;
 		tx_ring->next_to_use = ring_num;
+		dev_kfree_skb_any(skb);
 		return;
 	}
 	buffer_info->mapped = true;
-- 
2.17.1