vrf: Fix use-after-free in vrf_xmit

KASAN detected a use-after-free:

[  269.467067] BUG: KASAN: use-after-free in vrf_xmit+0x7f1/0x827 [vrf] at addr ffff8800350a21c0
[  269.467067] Read of size 4 by task ssh/1879
[  269.467067] CPU: 1 PID: 1879 Comm: ssh Not tainted 4.10.0+ torvalds#249
[  269.467067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[  269.467067] Call Trace:
[  269.467067]  dump_stack+0x81/0xb6
[  269.467067]  kasan_object_err+0x21/0x78
[  269.467067]  kasan_report+0x2f7/0x450
[  269.467067]  ? vrf_xmit+0x7f1/0x827 [vrf]
[  269.467067]  ? ip_output+0xa4/0xdb
[  269.467067]  __asan_load4+0x6b/0x6d
[  269.467067]  vrf_xmit+0x7f1/0x827 [vrf]
...

Which corresponds to the skb access after xmit handling. Fix by saving
skb->len and using the saved value to update stats.

Fixes: 193125d ("net: Introduce VRF device driver")
Signed-off-by: David Ahern <[email protected]>

drivers/net/vrf.c

@@ -340,14 +340,15 @@ static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
 
 static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
 {
+ int len = skb->len;
  netdev_tx_t ret = is_ip_tx_frame(skb, dev);
 
  if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
  struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
 
  u64_stats_update_begin(&dstats->syncp);
  dstats->tx_pkts++;
- dstats->tx_bytes += skb->len;
+ dstats->tx_bytes += len;
  u64_stats_update_end(&dstats->syncp);
  } else {
  this_cpu_inc(dev->dstats->tx_drps);