netdev - [PATCH wpan 2/2] net: mac802154: tx: expand tailroom if necessary

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Date:   Mon,  2 Jul 2018 16:32:03 -0400
From:   Alexander Aring <aring@...atatu.com>
To:     stefan@....samsung.com
Cc:     linux-wpan@...r.kernel.org, netdev@...r.kernel.org,
        kernel@...atatu.com, Alexander Aring <aring@...atatu.com>
Subject: [PATCH wpan 2/2] 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@...u.no>
Reported-by: Rabi Narayan Sahoo <rabinarayans0828@...il.com>
Signed-off-by: Alexander Aring <aring@...atatu.com>
---
 net/mac802154/tx.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/net/mac802154/tx.c b/net/mac802154/tx.c
index 7e253455f9dd..bcd1a5e6ebf4 100644
--- a/net/mac802154/tx.c
+++ b/net/mac802154/tx.c
@@ -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));
 	}
 
-- 
2.11.0