From 7cc76f51508219a74dca835745e4f84393820017 Mon Sep 17 00:00:00 2001 From: Jason Wang Date: Thu, 20 Nov 2014 16:31:05 +0800 Subject: [PATCH] macvtap: advance iov iterator when needed in macvtap_put_user() 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 Signed-off-by: Jason Wang Acked-by: Herbert Xu Signed-off-by: David S. Miller --- drivers/net/macvtap.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c index cea99d4a8263..42a80d3de839 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; -- 2.20.1