Merge branch 'rmnet-fixes'

Subash Abhinov Kasiviswanathan says:

====================
net: qualcomm: rmnet: Updates 2018-10-02

This series is a set of small fixes for rmnet driver

Patch 1 is a fix for a scenario reported by syzkaller
Patch 2 & 3 are fixes for incorrect allocation flags
====================

Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c

···
 	struct sk_buff *skbn;
 
 	if (skb->dev->type == ARPHRD_ETHER) {
-		if (pskb_expand_head(skb, ETH_HLEN, 0, GFP_KERNEL)) {
+		if (pskb_expand_head(skb, ETH_HLEN, 0, GFP_ATOMIC)) {
 			kfree_skb(skb);
 			return;
 		}
···
 	}
 
 	if (skb_headroom(skb) < required_headroom) {
-		if (pskb_expand_head(skb, required_headroom, 0, GFP_KERNEL))
+		if (pskb_expand_head(skb, required_headroom, 0, GFP_ATOMIC))
 			return -ENOMEM;
 	}
 
···
 
 	if (!skb)
 		goto done;
+
+	if (skb->pkt_type == PACKET_LOOPBACK)
+		return RX_HANDLER_PASS;
 
 	dev = skb->dev;
 	port = rmnet_get_port(dev);