ixgbe: fix crash in build_skb Rx code path
commit0c5661ecc5
upstream. Add check for build_skb enabled ring in ixgbe_dma_sync_frag(). In that case &skb_shinfo(skb)->frags[0] may not always be set which can lead to a crash. Instead we derive the page offset from skb->data. Fixes:42073d91a2
("ixgbe: Have the CPU take ownership of the buffers sooner") CC: stable <stable@vger.kernel.org> Reported-by: Ambarish Soman <asoman@redhat.com> Suggested-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1877,6 +1877,14 @@ static void ixgbe_dma_sync_frag(struct ixgbe_ring *rx_ring,
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ixgbe_rx_pg_size(rx_ring),
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DMA_FROM_DEVICE,
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IXGBE_RX_DMA_ATTR);
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} else if (ring_uses_build_skb(rx_ring)) {
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unsigned long offset = (unsigned long)(skb->data) & ~PAGE_MASK;
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dma_sync_single_range_for_cpu(rx_ring->dev,
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IXGBE_CB(skb)->dma,
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offset,
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skb_headlen(skb),
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DMA_FROM_DEVICE);
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} else {
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struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[0];
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