vringh: fix range used in iotlb_translate()
authorStefano Garzarella <sgarzare@redhat.com>
Wed, 9 Nov 2022 10:25:02 +0000 (11:25 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 12 Jan 2023 11:02:07 +0000 (12:02 +0100)
commit909fb8fbd46b3e16b21880ea862a0263dfc17c7a
tree888280e37980bf477a3441ca21fd1af4c9c22c4a
parent9bc360aa816f7694b0f97371cecc850148ff3295
vringh: fix range used in iotlb_translate()

[ Upstream commit f85efa9b0f5381874f727bd98f56787840313f0b ]

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

In iotlb_translate() 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: 9ad9c49cfe97 ("vringh: IOTLB support")
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20221109102503.18816-2-sgarzare@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/vhost/vringh.c