[PATCH AUTOSEL for 4.4 28/28] xen: xenbus driver must not accept invalid transaction ids

From: Juergen Gross [ Upstream commit 639b08810d6ad74ded2c5f6e233c4fcb9d147168 ] When accessing Xenstore in a transaction the user is specifying a transaction id which he normally obtained from Xenstore when starting the transaction. Xenstore is validating a transaction id

[PATCH AUTOSEL for 4.4 28/28] xen: xenbus driver must not accept invalid transaction ids

From: Juergen Gross [ Upstream commit 639b08810d6ad74ded2c5f6e233c4fcb9d147168 ] When accessing Xenstore in a transaction the user is specifying a transaction id which he normally obtained from Xenstore when starting the transaction. Xenstore is validating a transaction id against all known