vhost: fix range used in translate_desc()
authorStefano Garzarella <sgarzare@redhat.com>
Wed, 9 Nov 2022 10:25:03 +0000 (11:25 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 12 Jan 2023 10:59:11 +0000 (11:59 +0100)
commite3462410c36d7fa265e62255809ce55ae4bd0326
treec7fd80e8e879c1a87693ad775089d72d0e50c418
parent13871f60ec2f603752451f3c2e88be671d7ea56d
vhost: fix range used in translate_desc()

[ Upstream commit 98047313cdb46828093894d0ac8b1183b8b317f9 ]

vhost_iotlb_itree_first() requires `start` and `last` parameters
to search for a mapping that overlaps the range.

In translate_desc() we cyclically call vhost_iotlb_itree_first(),
incrementing `addr` by the amount already translated, so rightly
we move the `start` parameter passed to vhost_iotlb_itree_first(),
but we should hold the `last` parameter constant.

Let's fix it by saving the `last` parameter value before incrementing
`addr` in the loop.

Fixes: a9709d6874d5 ("vhost: convert pre sorted vhost memory array to interval tree")
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20221109102503.18816-3-sgarzare@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/vhost/vhost.c