From c235082b50f6dd81436b82fd73ffbdeede4ec2e4 Mon Sep 17 00:00:00 2001 From: Cornelia Huck Date: Tue, 1 Mar 2016 13:44:53 +0100 Subject: [PATCH] virtio/s390: size of SET_IND payload SET_IND takes as a payload the _address_ of the indicators, meaning that we have one of the rare cases where kmalloc(sizeof(&...)) is actually correct. Let's clarify that with a comment. The count for the ccw, however, was only correct because the indicators are 64 bit. Let's use the correct value. Reported-by: Martin Schwidefsky Reviewed-by: Halil Pasic Reviewed-by: David Hildenbrand Signed-off-by: Cornelia Huck Signed-off-by: Michael S. Tsirkin --- drivers/s390/virtio/virtio_ccw.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c index 46b110a124b0..8688ad4c825f 100644 --- a/drivers/s390/virtio/virtio_ccw.c +++ b/drivers/s390/virtio/virtio_ccw.c @@ -342,13 +342,14 @@ static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, ccw->count = sizeof(*thinint_area); ccw->cda = (__u32)(unsigned long) thinint_area; } else { + /* payload is the address of the indicators */ indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL); if (!indicatorp) return; *indicatorp = 0; ccw->cmd_code = CCW_CMD_SET_IND; - ccw->count = sizeof(vcdev->indicators); + ccw->count = sizeof(&vcdev->indicators); ccw->cda = (__u32)(unsigned long) indicatorp; } /* Deregister indicators from host. */ @@ -656,7 +657,10 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, } } ret = -ENOMEM; - /* We need a data area under 2G to communicate. */ + /* + * We need a data area under 2G to communicate. Our payload is + * the address of the indicators. + */ indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL); if (!indicatorp) goto out; @@ -672,7 +676,7 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, vcdev->indicators = 0; ccw->cmd_code = CCW_CMD_SET_IND; ccw->flags = 0; - ccw->count = sizeof(vcdev->indicators); + ccw->count = sizeof(&vcdev->indicators); ccw->cda = (__u32)(unsigned long) indicatorp; ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); if (ret) @@ -683,7 +687,7 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, vcdev->indicators2 = 0; ccw->cmd_code = CCW_CMD_SET_CONF_IND; ccw->flags = 0; - ccw->count = sizeof(vcdev->indicators2); + ccw->count = sizeof(&vcdev->indicators2); ccw->cda = (__u32)(unsigned long) indicatorp; ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); if (ret)