6LoWPAN: fix skb_copy call

This patch fixes 2 issues in lowpan_skb_deliver function:
1. Check for return status of skb_copy call;
2. Use skb_copy with proper GFP flag, drop check for non-interrupt
context.

Signed-off-by: Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index f0d1536..19d6aef 100644 (file)
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -479,10 +479,10 @@ static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr)
        int stat = NET_RX_SUCCESS;
 
        new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
-                                                               GFP_KERNEL);
+                                                               GFP_ATOMIC);
        kfree_skb(skb);
 
-       if (NULL == new)
+       if (!new)
                return -ENOMEM;
 
        skb_push(new, sizeof(struct ipv6hdr));
@@ -495,13 +495,14 @@ static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr)
        rcu_read_lock();
        list_for_each_entry_rcu(entry, &lowpan_devices, list)
                if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) {
-                       skb = skb_copy(new, GFP_KERNEL);
-                       skb->dev = entry->ldev;
+                       skb = skb_copy(new, GFP_ATOMIC);
+                       if (!skb) {
+                               stat = -ENOMEM;
+                               break;
+                       }
 
-                       if (in_interrupt())
-                               stat = netif_rx(skb);
-                       else
-                               stat = netif_rx_ni(skb);
+                       skb->dev = entry->ldev;
+                       stat = netif_rx(skb);
                }
        rcu_read_unlock();