macvtap: zerocopy: fix offset calculation when building skb

commit 3afc9621f15701c557e60f61eba9242bac2771dd upstream.

This patch fixes the offset calculation when building skb:

- offset1 were used as skb data offset not vector offset
- reset offset to zero only when we advance to next vector

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index c1d602d5f15e9d47fc2570dfae5fed390badcc70..0302bc5adc69288ef30dcd7ccc51bbbd620852d3 100644 (file)
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -506,10 +506,11 @@ static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from,
                if (copy > size) {
                        ++from;
                        --count;
-               }
+                       offset = 0;
+               } else
+                       offset += size;
                copy -= size;
                offset1 += size;
-               offset = 0;
        }
 
        if (len == offset1)
@@ -520,13 +521,13 @@ static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from,
                int num_pages;
                unsigned long base;
 
-               len = from->iov_len - offset1;
+               len = from->iov_len - offset;
                if (!len) {
-                       offset1 = 0;
+                       offset = 0;
                        ++from;
                        continue;
                }
-               base = (unsigned long)from->iov_base + offset1;
+               base = (unsigned long)from->iov_base + offset;
                size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT;
                if (i + size > MAX_SKB_FRAGS)
                        return -EMSGSIZE;
@@ -548,7 +549,7 @@ static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from,
                        len -= size;
                        i++;
                }
-               offset1 = 0;
+               offset = 0;
                ++from;
        }
        return 0;