Commit 6ce27549 authored by Alexander Aring's avatar Alexander Aring Committed by Greg Kroah-Hartman
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net: 6lowpan: fix reserved space for single frames

commit ac74f87c upstream.

This patch fixes patch add handling to take care tail and headroom for
single 6lowpan frames. We need to be sure we have a skb with the right
head and tailroom for single frames. This patch do it by using
skb_copy_expand() if head and tailroom is not enough allocated by upper
layer.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=195059

Reported-by: default avatarDavid Palma <david.palma@ntnu.no>
Reported-by: default avatarRabi Narayan Sahoo <rabinarayans0828@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarAlexander Aring <aring@mojatatu.com>
Signed-off-by: default avatarStefan Schmidt <stefan@datenfreihafen.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 832fa818
......@@ -265,9 +265,24 @@ netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *ldev)
/* We must take a copy of the skb before we modify/replace the ipv6
* header as the header could be used elsewhere
*/
skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb)
return NET_XMIT_DROP;
if (unlikely(skb_headroom(skb) < ldev->needed_headroom ||
skb_tailroom(skb) < ldev->needed_tailroom)) {
struct sk_buff *nskb;
nskb = skb_copy_expand(skb, ldev->needed_headroom,
ldev->needed_tailroom, GFP_ATOMIC);
if (likely(nskb)) {
consume_skb(skb);
skb = nskb;
} else {
kfree_skb(skb);
return NET_XMIT_DROP;
}
} else {
skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb)
return NET_XMIT_DROP;
}
ret = lowpan_header(skb, ldev, &dgram_size, &dgram_offset);
if (ret < 0) {
......
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