When mergeable buffer is used, vnet_hdr_sz is greater than sizeof struct
virtio_net_hdr. So we need advance the iov iterators in this case.
Fixes 6c36d2e26cda1ad3e2c4b90dd843825fc62fe5b4 ("macvtap: Use iovec iterators")
Cc: Herbert Xu <[email protected]>
Signed-off-by: Jason Wang <[email protected]>
---
drivers/net/macvtap.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index cea99d4..42a80d3 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -797,6 +797,8 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
if (copy_to_iter(&vnet_hdr, sizeof(vnet_hdr), iter) !=
sizeof(vnet_hdr))
return -EFAULT;
+
+ iov_iter_advance(iter, vnet_hdr_len - sizeof(vnet_hdr));
}
total = vnet_hdr_len;
total += skb->len;
--
1.9.1
--
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