kni: fix segmented mbuf data overflow

[ upstream commit 60d7deb ]

'kni_net_rx_lo_fifo()' can get segmented buffers, using 'pkt_len' for
that case will be wrong and some values can cause buffer overflow
in destination mbuf data.

Fixes: d89a58d ("kni: support chained mbufs")

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>

kernel/linux/kni/kni_net.c

@@ -440,7 +440,7 @@ kni_net_rx_lo_fifo(struct kni_dev *kni)
 		/* Copy mbufs */
 		for (i = 0; i < num; i++) {
 			kva = pa2kva(kni->pa[i]);
-			len = kva->pkt_len;
+			len = kva->data_len;
 			data_kva = kva2data_kva(kva);
 			kni->va[i] = pa2va(kni->pa[i], kva);