linux-kernel - [PATCH] net: gemini: Fix memory leak in gmac_setup

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Message-Id: <20191215011045.15453-1-navid.emamdoost@gmail.com>
Date:   Sat, 14 Dec 2019 19:10:44 -0600
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     Hans Ulli Kroll <ulli.kroll@...glemail.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     emamd001@....edu, Navid Emamdoost <navid.emamdoost@...il.com>
Subject: [PATCH] net: gemini: Fix memory leak in gmac_setup_txqs

In the implementation of gmac_setup_txqs() the allocated desc_ring is
leaked if TX queue base is not aligned. Release it via
dma_free_coherent.

Fixes: 4d5ae32f5e1e ("net: ethernet: Add a driver for Gemini gigabit ethernet")
Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
 drivers/net/ethernet/cortina/gemini.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/cortina/gemini.c b/drivers/net/ethernet/cortina/gemini.c
index a8f4c69252ff..3a796fe099dd 100644
--- a/drivers/net/ethernet/cortina/gemini.c
+++ b/drivers/net/ethernet/cortina/gemini.c
@@ -576,6 +576,8 @@ static int gmac_setup_txqs(struct net_device *netdev)
 
 	if (port->txq_dma_base & ~DMA_Q_BASE_MASK) {
 		dev_warn(geth->dev, "TX queue base is not aligned\n");
+		dma_free_coherent(geth->dev, len * sizeof(*desc_ring),
+				  desc_ring, port->txq_dma_base);
 		kfree(skb_tab);
 		return -ENOMEM;
 	}
-- 
2.17.1