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virtio-net: fix leaking page for gso packet during mergeable XDP

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[ Upstream commit 3d62b2a0db ]

We need to drop refcnt to xdp_page if we see a gso packet. Otherwise
it will be leaked. Fixing this by moving the check of gso packet above
the linearizing logic. While at it, remove useless comment as well.

Cc: John Fastabend <john.fastabend@gmail.com>
Fixes: 72979a6c35 ("virtio_net: xdp, add slowpath case for non contiguous buffers")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jason Wang
2018-05-22 11:44:31 +08:00
committed by Greg Kroah-Hartman
parent 2b8b2b26c3
commit fa11d99253
1 changed files with 7 additions and 8 deletions
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15
drivers/net/virtio_net.c
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@@ -632,6 +632,13 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
void *data;
u32 act;
/* Transient failure which in theory could occur if
* in-flight packets from before XDP was enabled reach
* the receive path after XDP is loaded.
*/
if (unlikely(hdr->hdr.gso_type))
goto err_xdp;
/* This happens when rx buffer size is underestimated */
if (unlikely(num_buf > 1 ||
headroom < virtnet_get_headroom(vi))) {
@@ -647,14 +654,6 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
xdp_page = page;
}
/* Transient failure which in theory could occur if
* in-flight packets from before XDP was enabled reach
* the receive path after XDP is loaded. In practice I
* was not able to create this condition.
*/
if (unlikely(hdr->hdr.gso_type))
goto err_xdp;
/* Allow consuming headroom but reserve enough space to push
* the descriptor on if we get an XDP_TX return code.
*/