ca8210: fix mac_len negative array access

This patch fixes a buffer overflow access of skb->data if
ieee802154_hdr_peek_addrs() fails.

Reported-by: lianhui tang <[email protected]>
Signed-off-by: Alexander Aring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Stefan Schmidt <[email protected]>

Author: Alexander Aring

drivers/net/ieee802154/ca8210.c

@@ -1913,6 +1913,8 @@ static int ca8210_skb_tx(
 	 * packet
 	 */
 	mac_len = ieee802154_hdr_peek_addrs(skb, &header);
+	if (mac_len < 0)
+		return mac_len;
 
 	secspec.security_level = header.sec.level;
 	secspec.key_id_mode = header.sec.key_id_mode;