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Date: Wed, 16 Nov 2022 08:21:19 -0800 From: Alexander H Duyck <alexander.duyck@...il.com> To: Wang Hai <wanghai38@...wei.com>, jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com, baijiaju1990@....com, jeffrey.t.kirsher@...el.com, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org Subject: Re: [PATCH net] e100: Fix possible use after free in e100_xmit_prepare On Wed, 2022-11-16 at 01:24 +0800, Wang Hai wrote: > In e100_xmit_prepare(), if we can't map the skb, then return -ENOMEM, so > e100_xmit_frame() will return NETDEV_TX_BUSY and the upper layer will > resend the skb. But the skb is already freed, which will cause UAF bug > when the upper layer resends the skb. > > Remove the harmful free. > > Fixes: 5e5d49422dfb ("e100: Release skb when DMA mapping is failed in e100_xmit_prepare") > Signed-off-by: Wang Hai <wanghai38@...wei.com> > --- > drivers/net/ethernet/intel/e100.c | 5 +---- > 1 file changed, 1 insertion(+), 4 deletions(-) > > diff --git a/drivers/net/ethernet/intel/e100.c b/drivers/net/ethernet/intel/e100.c > index 560d1d442232..d3fdc290937f 100644 > --- a/drivers/net/ethernet/intel/e100.c > +++ b/drivers/net/ethernet/intel/e100.c > @@ -1741,11 +1741,8 @@ static int e100_xmit_prepare(struct nic *nic, struct cb *cb, > dma_addr = dma_map_single(&nic->pdev->dev, skb->data, skb->len, > DMA_TO_DEVICE); > /* If we can't map the skb, have the upper layer try later */ > - if (dma_mapping_error(&nic->pdev->dev, dma_addr)) { > - dev_kfree_skb_any(skb); > - skb = NULL; > + if (dma_mapping_error(&nic->pdev->dev, dma_addr)) > return -ENOMEM; > - } > > /* > * Use the last 4 bytes of the SKB payload packet as the CRC, used for I'm surprised the original patch that this essentially reverts was even accepted. Reviewed-by: Alexander Duyck <alexanderduyck@...com>
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