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epic100: fix use after free on rmmod

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commit 8ee9d82cd0a45e7d050ade598c9f33032a0f2891 upstream.

epic_close() calls epic_rx() and uses dma buffer, but in epic_remove_one()
we already freed the dma buffer. To fix this issue, reorder function calls
like in the .probe function.

BUG: KASAN: use-after-free in epic_rx+0xa6/0x7e0 [epic100]
Call Trace:
 epic_rx+0xa6/0x7e0 [epic100]
 epic_close+0xec/0x2f0 [epic100]
 unregister_netdev+0x18/0x20
 epic_remove_one+0xaa/0xf0 [epic100]

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-by: Yilun Wu <yiluwu@cs.stonybrook.edu>
Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Reviewed-by: Francois Romieu <romieu@fr.zoreil.com>
Link: https://lore.kernel.org/r/20220627043351.25615-1-ztong0001@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tong Zhang
2022-06-26 21:33:48 -07:00
committed by Greg Kroah-Hartman
parent 456bc33887
commit b8def021ac
1 changed files with 2 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/net/ethernet/smsc/epic100.c
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@@ -1513,14 +1513,14 @@ static void epic_remove_one(struct pci_dev *pdev)
struct net_device *dev = pci_get_drvdata(pdev); struct net_device *dev = pci_get_drvdata(pdev);
struct epic_private *ep = netdev_priv(dev); struct epic_private *ep = netdev_priv(dev);
unregister_netdev(dev);
dma_free_coherent(&pdev->dev, TX_TOTAL_SIZE, ep->tx_ring, dma_free_coherent(&pdev->dev, TX_TOTAL_SIZE, ep->tx_ring,
ep->tx_ring_dma); ep->tx_ring_dma);
dma_free_coherent(&pdev->dev, RX_TOTAL_SIZE, ep->rx_ring, dma_free_coherent(&pdev->dev, RX_TOTAL_SIZE, ep->rx_ring,
ep->rx_ring_dma); ep->rx_ring_dma);
unregister_netdev(dev);
pci_iounmap(pdev, ep->ioaddr); pci_iounmap(pdev, ep->ioaddr);
pci_release_regions(pdev);
free_netdev(dev); free_netdev(dev);
pci_release_regions(pdev);
pci_disable_device(pdev); pci_disable_device(pdev);
/* pci_power_off(pdev, -1); */ /* pci_power_off(pdev, -1); */
} }