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net: mac802154: tx: expand tailroom if necessary 

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@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>
This commit is contained in:
Alexander Aring 2018-07-02 16:32:03 -04:00 committed by Stefan Schmidt
parent ac74f87c78
commit f9c5283113
1 changed files with 14 additions and 1 deletions
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15
net/mac802154/tx.c
View File

@ -63,8 +63,21 @@ ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
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));
}