linux-kernel - [PATCH 4.9 02/63] net: mac802154: tx: expand tailroom if necessary

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Date:   Fri,  7 Sep 2018 23:09:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Palma <david.palma@...u.no>,
        Rabi Narayan Sahoo <rabinarayans0828@...il.com>,
        Alexander Aring <aring@...atatu.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>
Subject: [PATCH 4.9 02/63] net: mac802154: tx: expand tailroom if necessary

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexander Aring <aring@...atatu.com>

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@...u.no>
Reported-by: Rabi Narayan Sahoo <rabinarayans0828@...il.com>
Cc: stable@...r.kernel.org
Signed-off-by: Alexander Aring <aring@...atatu.com>
Signed-off-by: Stefan Schmidt <stefan@...enfreihafen.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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));
 	}