The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 8ee9d82cd0a45e7d050ade598c9f33032a0f2891 Mon Sep 17 00:00:00 2001 From: Tong Zhang ztong0001@gmail.com Date: Sun, 26 Jun 2022 21:33:48 -0700 Subject: [PATCH] epic100: fix use after free on rmmod
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: 1da177e4c3f4 ("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
diff --git a/drivers/net/ethernet/smsc/epic100.c b/drivers/net/ethernet/smsc/epic100.c index a0654e88444c..0329caf63279 100644 --- a/drivers/net/ethernet/smsc/epic100.c +++ b/drivers/net/ethernet/smsc/epic100.c @@ -1515,14 +1515,14 @@ static void epic_remove_one(struct pci_dev *pdev) struct net_device *dev = pci_get_drvdata(pdev); struct epic_private *ep = netdev_priv(dev);
+ unregister_netdev(dev); dma_free_coherent(&pdev->dev, TX_TOTAL_SIZE, ep->tx_ring, ep->tx_ring_dma); dma_free_coherent(&pdev->dev, RX_TOTAL_SIZE, ep->rx_ring, ep->rx_ring_dma); - unregister_netdev(dev); pci_iounmap(pdev, ep->ioaddr); - pci_release_regions(pdev); free_netdev(dev); + pci_release_regions(pdev); pci_disable_device(pdev); /* pci_power_off(pdev, -1); */ }