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From: Tong Zhang <ztong0001@gmail.com>
To: Nicolas Ferre <nicolas.ferre@microchip.com>,
	Claudiu Beznea <claudiu.beznea@microchip.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Tong Zhang <ztong0001@gmail.com>,
	Nicolas Ferre <Nicolas.Ferre@microchip.com>
Subject: [PATCH v2] net: macb: fix use after free on rmmod
Date: Wed,  8 Sep 2021 12:02:32 -0700	[thread overview]
Message-ID: <20210908190232.573178-1-ztong0001@gmail.com> (raw)
In-Reply-To: <48b53487-a708-ec79-a993-3448f4ca6e6d@microchip.com>

plat_dev->dev->platform_data is released by platform_device_unregister(),
use of pclk and hclk is a use-after-free. Since device unregister won't
need a clk device we adjust the function call sequence to fix this issue.

[   31.261225] BUG: KASAN: use-after-free in macb_remove+0x77/0xc6 [macb_pci]
[   31.275563] Freed by task 306:
[   30.276782]  platform_device_release+0x25/0x80

Suggested-by: Nicolas Ferre <Nicolas.Ferre@microchip.com>
Signed-off-by: Tong Zhang <ztong0001@gmail.com>
---
v2: switch lines to fix the issue instead

 drivers/net/ethernet/cadence/macb_pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cadence/macb_pci.c b/drivers/net/ethernet/cadence/macb_pci.c
index 8b7b59908a1a..f66d22de5168 100644
--- a/drivers/net/ethernet/cadence/macb_pci.c
+++ b/drivers/net/ethernet/cadence/macb_pci.c
@@ -111,9 +111,9 @@ static void macb_remove(struct pci_dev *pdev)
 	struct platform_device *plat_dev = pci_get_drvdata(pdev);
 	struct macb_platform_data *plat_data = dev_get_platdata(&plat_dev->dev);
 
-	platform_device_unregister(plat_dev);
 	clk_unregister(plat_data->pclk);
 	clk_unregister(plat_data->hclk);
+	platform_device_unregister(plat_dev);
 }
 
 static const struct pci_device_id dev_id_table[] = {
-- 
2.25.1


  reply	other threads:[~2021-09-08 19:02 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-07 20:29 [PATCH v1] " Tong Zhang
2021-09-08  7:27 ` Nicolas.Ferre
2021-09-08 19:02   ` Tong Zhang [this message]
2021-09-09  7:53     ` [PATCH v2] " Nicolas Ferre
2021-09-09 10:00     ` patchwork-bot+netdevbpf
2021-09-08 19:02   ` [PATCH v1] " Tong Zhang

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