[NET]: Make second arg to skb_reserved() signed.

Some subsystems, such as PPP, can send negative values
here.  It just happened to work correctly on 32-bit with
an unsigned value, but on 64-bit this explodes.

Figured out by Paul Mackerras based upon several PPP crash
reports.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index e5fd66c5650b53fd1354aab69591ede2d6ea8794..ad7cc22bd424a8bb21c3055efd55e0a79861a5a9 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -926,7 +926,7 @@ static inline int skb_tailroom(const struct sk_buff *skb)
  *     Increase the headroom of an empty &sk_buff by reducing the tail
  *     room. This is only allowed for an empty buffer.
  */
-static inline void skb_reserve(struct sk_buff *skb, unsigned int len)
+static inline void skb_reserve(struct sk_buff *skb, int len)
 {
        skb->data += len;
        skb->tail += len;