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net: macb: fix use after free on rmmod 

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>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tong Zhang 2021-09-08 12:02:32 -07:00 committed by David S. Miller
parent 273c29e944
commit d82d5303c4
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/cadence/macb_pci.c
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@ -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[] = {