| Message ID | 20220627043351.25615-1-ztong0001@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 8ee9d82cd0a45e7d050ade598c9f33032a0f2891 |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [v2] epic100: fix use after free on rmmod | expand |
Hello: This patch was applied to netdev/net.git (master) by Jakub Kicinski <kuba@kernel.org>: On Sun, 26 Jun 2022 21:33:48 -0700 you wrote: > 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] > > [...] Here is the summary with links: - [v2] epic100: fix use after free on rmmod https://git.kernel.org/netdev/net/c/8ee9d82cd0a4 You are awesome, thank you!
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); */ }
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> --- v2: amend fix tag drivers/net/ethernet/smsc/epic100.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)