Message ID | 20180223203941.3193-1-jeffrey.t.kirsher@intel.com |
---|---|
State | Accepted, archived |
Delegated to: | David Miller |
Headers | show |
Series | [net] ixgbe: fix crash in build_skb Rx code path | expand |
From: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Date: Fri, 23 Feb 2018 12:39:41 -0800 > From: Emil Tantilov <emil.s.tantilov@intel.com> > > 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: 42073d91a214 > ("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> Applied, thanks Jeff.
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c index 0da5aa2c8aba..9fc063af233c 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c @@ -1888,6 +1888,14 @@ static void ixgbe_dma_sync_frag(struct ixgbe_ring *rx_ring, ixgbe_rx_pg_size(rx_ring), DMA_FROM_DEVICE, IXGBE_RX_DMA_ATTR); + } else if (ring_uses_build_skb(rx_ring)) { + unsigned long offset = (unsigned long)(skb->data) & ~PAGE_MASK; + + dma_sync_single_range_for_cpu(rx_ring->dev, + IXGBE_CB(skb)->dma, + offset, + skb_headlen(skb), + DMA_FROM_DEVICE); } else { struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[0];