From 8b8f87767bf1864d79bc5ec0192b5d1409f845b4 Mon Sep 17 00:00:00 2001
From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Date: Sun, 26 Dec 2021 18:51:44 +0100
Subject: [PATCH 29/37] net: ag71xx: Fix a potential double free in error
handling paths
Git-commit: 1cd5384c88af5b59bf9f3b6c1a151bc14b88c2cd
Patch-mainline: v5.16-rc8
References: git-fixes
'ndev' is a managed resource allocated with devm_alloc_etherdev(), so there
is no need to call free_netdev() explicitly or there will be a double
free().
Simplify all error handling paths accordingly.
Fixes: d51b6ce441d3 ("net: ethernet: add ag71xx driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
drivers/net/ethernet/atheros/ag71xx.c | 23 ++++++++---------------
1 file changed, 8 insertions(+), 15 deletions(-)
diff --git a/drivers/net/ethernet/atheros/ag71xx.c b/drivers/net/ethernet/atheros/ag71xx.c
index 1ba81b1eb6fd..2f461e71c34e 100644
--- a/drivers/net/ethernet/atheros/ag71xx.c
+++ b/drivers/net/ethernet/atheros/ag71xx.c
@@ -1915,15 +1915,12 @@ static int ag71xx_probe(struct platform_device *pdev)
ag->mac_reset = devm_reset_control_get(&pdev->dev, "mac");
if (IS_ERR(ag->mac_reset)) {
netif_err(ag, probe, ndev, "missing mac reset\n");
- err = PTR_ERR(ag->mac_reset);
- goto err_free;
+ return PTR_ERR(ag->mac_reset);
}
ag->mac_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
- if (!ag->mac_base) {
- err = -ENOMEM;
- goto err_free;
- }
+ if (!ag->mac_base)
+ return -ENOMEM;
ndev->irq = platform_get_irq(pdev, 0);
err = devm_request_irq(&pdev->dev, ndev->irq, ag71xx_interrupt,
@@ -1931,7 +1928,7 @@ static int ag71xx_probe(struct platform_device *pdev)
if (err) {
netif_err(ag, probe, ndev, "unable to request IRQ %d\n",
ndev->irq);
- goto err_free;
+ return err;
}
ndev->netdev_ops = &ag71xx_netdev_ops;
@@ -1959,10 +1956,8 @@ static int ag71xx_probe(struct platform_device *pdev)
ag->stop_desc = dmam_alloc_coherent(&pdev->dev,
sizeof(struct ag71xx_desc),
&ag->stop_desc_dma, GFP_KERNEL);
- if (!ag->stop_desc) {
- err = -ENOMEM;
- goto err_free;
- }
+ if (!ag->stop_desc)
+ return -ENOMEM;
ag->stop_desc->data = 0;
ag->stop_desc->ctrl = 0;
@@ -1977,7 +1972,7 @@ static int ag71xx_probe(struct platform_device *pdev)
err = of_get_phy_mode(np, &ag->phy_if_mode);
if (err) {
netif_err(ag, probe, ndev, "missing phy-mode property in DT\n");
- goto err_free;
+ return err;
}
netif_napi_add(ndev, &ag->napi, ag71xx_poll, AG71XX_NAPI_WEIGHT);
@@ -1985,7 +1980,7 @@ static int ag71xx_probe(struct platform_device *pdev)
err = clk_prepare_enable(ag->clk_eth);
if (err) {
netif_err(ag, probe, ndev, "Failed to enable eth clk.\n");
- goto err_free;
+ return err;
}
ag71xx_wr(ag, AG71XX_REG_MAC_CFG1, 0);
@@ -2021,8 +2016,6 @@ static int ag71xx_probe(struct platform_device *pdev)
ag71xx_mdio_remove(ag);
err_put_clk:
clk_disable_unprepare(ag->clk_eth);
-err_free:
- free_netdev(ndev);
return err;
}
--
2.16.4