macvtap: fix the uninitialized var using in macvtap_alloc_skb()

Commit d1b08284 use new frag API but would leave f to be used
uninitialized, this patch fix it.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 7c3f84a..3da5578 100644 (file)
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -453,7 +453,6 @@ static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from,
        int copy = skb_headlen(skb);
        int size, offset1 = 0;
        int i = 0;
-       skb_frag_t *f;
 
        /* Skip over from offset */
        while (count && (offset >= from->iov_len)) {
@@ -503,14 +502,13 @@ static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from,
                skb->truesize += len;
                atomic_add(len, &skb->sk->sk_wmem_alloc);
                while (len) {
-                       __skb_fill_page_desc(
-                               skb, i, page[i],
-                               base & ~PAGE_MASK,
-                               min_t(int, len, PAGE_SIZE - f->page_offset));
+                       int off = base & ~PAGE_MASK;
+                       int size = min_t(int, len, PAGE_SIZE - off);
+                       __skb_fill_page_desc(skb, i, page[i], off, size);
                        skb_shinfo(skb)->nr_frags++;
                        /* increase sk_wmem_alloc */
-                       base += f->size;
-                       len -= f->size;
+                       base += size;
+                       len -= size;
                        i++;
                }
                offset1 = 0;