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| author | Alexander Aring <aring@mojatatu.com> | 2018-07-14 12:52:10 -0400 |
|---|---|---|
| committer | Stefan Schmidt <stefan@datenfreihafen.org> | 2018-08-06 11:21:15 +0200 |
| commit | ac74f87c789af40936a80131c4759f3e72579c3a (patch) | |
| tree | e73a6660cbf473fd6b9760435dced195178adb70 /net/ieee802154 | |
| parent | a30461080366214b690a367225a48c95d7a6a189 (diff) | |
| download | linux-ac74f87c789af40936a80131c4759f3e72579c3a.tar.gz linux-ac74f87c789af40936a80131c4759f3e72579c3a.tar.bz2 linux-ac74f87c789af40936a80131c4759f3e72579c3a.zip | |
net: 6lowpan: fix reserved space for single frames
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: David Palma <david.palma@ntnu.no>
Reported-by: Rabi Narayan Sahoo <rabinarayans0828@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Diffstat (limited to 'net/ieee802154')
| -rw-r--r-- | net/ieee802154/6lowpan/tx.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/net/ieee802154/6lowpan/tx.c b/net/ieee802154/6lowpan/tx.c index e6ff5128e61a..ca53efa17be1 100644 --- a/net/ieee802154/6lowpan/tx.c +++ b/net/ieee802154/6lowpan/tx.c @@ -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) { |