linux-kernel - [PATCH] [v3] ethernet: atheros: fix a memleak in atl1e_setup_ring

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Date:   Thu, 14 Dec 2023 21:04:04 +0800
From:   Zhipeng Lu <alexious@....edu.cn>
To:     alexious@....edu.cn
Cc:     Suman Ghosh <sumang@...vell.com>,
        Chris Snook <chris.snook@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Simon Horman <horms@...nel.org>,
        Yuanjun Gong <ruc_gongyuanjun@....com>,
        Jeff Garzik <jgarzik@...hat.com>,
        Jie Yang <jie.yang@...eros.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] [v3] ethernet: atheros: fix a memleak in atl1e_setup_ring_resources

In the error handling of 'offset > adapter->ring_size', the
tx_ring->tx_buffer allocated by kzalloc should be freed,
instead of 'goto failed' instantly.

Fixes: a6a5325239c2 ("atl1e: Atheros L1E Gigabit Ethernet driver")
Signed-off-by: Zhipeng Lu <alexious@....edu.cn>
Reviewed-by: Suman Ghosh <sumang@...vell.com>
---

Changelog:

v2: Setting tx_ring->tx_buffer to NULL after free.
v3: Moving free and set-null operation to a new label free_buffer.
---
 drivers/net/ethernet/atheros/atl1e/atl1e_main.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/atheros/atl1e/atl1e_main.c b/drivers/net/ethernet/atheros/atl1e/atl1e_main.c
index 5935be190b9e..5f2a6fcba967 100644
--- a/drivers/net/ethernet/atheros/atl1e/atl1e_main.c
+++ b/drivers/net/ethernet/atheros/atl1e/atl1e_main.c
@@ -866,10 +866,13 @@ static int atl1e_setup_ring_resources(struct atl1e_adapter *adapter)
 		netdev_err(adapter->netdev, "offset(%d) > ring size(%d) !!\n",
 			   offset, adapter->ring_size);
 		err = -1;
-		goto failed;
+		goto free_buffer;
 	}
 
 	return 0;
+free_buffer:
+	kfree(tx_ring->tx_buffer);
+	tx_ring->tx_buffer = NULL;
 failed:
 	if (adapter->ring_vir_addr != NULL) {
 		dma_free_coherent(&pdev->dev, adapter->ring_size,
-- 
2.34.1