4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Alexander Aring <aring@xxxxxxxxxxxx>
commit f9c52831133050c6b82aa8b6831c92da2bbf2a0b upstream.
This patch is necessary if case of AF_PACKET or other socket interface
which I am aware of it and didn't allocated the necessary room.
Reported-by: David Palma <david.palma@xxxxxxx>
Reported-by: Rabi Narayan Sahoo <rabinarayans0828@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Alexander Aring <aring@xxxxxxxxxxxx>
Signed-off-by: Stefan Schmidt <stefan@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/mac802154/tx.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
--- a/net/mac802154/tx.c
+++ b/net/mac802154/tx.c
@@ -63,8 +63,21 @@ ieee802154_tx(struct ieee802154_local *l
int ret;
if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) {
- u16 crc = crc_ccitt(0, skb->data, skb->len);
+ struct sk_buff *nskb;
+ u16 crc;
+ if (unlikely(skb_tailroom(skb) < IEEE802154_FCS_LEN)) {
+ nskb = skb_copy_expand(skb, 0, IEEE802154_FCS_LEN,
+ GFP_ATOMIC);
+ if (likely(nskb)) {
+ consume_skb(skb);
+ skb = nskb;
+ } else {
+ goto err_tx;
+ }
+ }
+
+ crc = crc_ccitt(0, skb->data, skb->len);
put_unaligned_le16(crc, skb_put(skb, 2));
}
