linux-kernel - [net PATCH] net: ethernet: stmicro: stmmac: fix possible memory leak in __stmmac

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Date:   Wed, 14 Jun 2023 09:32:41 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Christian Marangi <ansuelsmth@...il.com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Jose Abreu <Jose.Abreu@...opsys.com>, stable@...r.kernel.org
Subject: [net PATCH] net: ethernet: stmicro: stmmac: fix possible memory leak in __stmmac_open

Fix a possible memory leak in __stmmac_open when stmmac_init_phy fails.
It's also needed to free everything allocated by stmmac_setup_dma_desc
and not just the dma_conf struct.

Correctly call free_dma_desc_resources on the new dma_conf passed to
__stmmac_open on error.

Reported-by: Jose Abreu <Jose.Abreu@...opsys.com>
Fixes: ba39b344e924 ("net: ethernet: stmicro: stmmac: generate stmmac dma conf before open")
Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
Cc: stable@...r.kernel.org
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index fa07b0d50b46..0966ab86fde2 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3877,10 +3877,10 @@ static int __stmmac_open(struct net_device *dev,
 
 	stmmac_hw_teardown(dev);
 init_error:
-	free_dma_desc_resources(priv, &priv->dma_conf);
 	phylink_disconnect_phy(priv->phylink);
 init_phy_error:
 	pm_runtime_put(priv->device);
+	free_dma_desc_resources(priv, dma_conf);
 	return ret;
 }
 
-- 
2.40.1