From d1db1fa8dfcea9c62643f624f2a07d2fd375ce45 Mon Sep 17 00:00:00 2001 From: Cornelia Huck Date: Wed, 5 Jun 2013 17:13:05 +0200 Subject: virtio-ccw: Fix unsetting of indicators. Interpretation of the ccws to register (configuration) indicators contained a thinko: We want to disallow reading from 0, but setting the indicator pointer to 0 is fine. Let's fix the handling for CCW_CMD_SET{,_CONF}_IND. Cc: qemu-stable@nongnu.org Signed-off-by: Cornelia Huck --- hw/s390x/virtio-ccw.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c index 5f5e267558..44f5772bb2 100644 --- a/hw/s390x/virtio-ccw.c +++ b/hw/s390x/virtio-ccw.c @@ -328,10 +328,10 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw) ret = -EINVAL; break; } - indicators = ldq_phys(ccw.cda); - if (!indicators) { + if (!ccw.cda) { ret = -EFAULT; } else { + indicators = ldq_phys(ccw.cda); dev->indicators = indicators; sch->curr_status.scsw.count = ccw.count - sizeof(indicators); ret = 0; @@ -348,10 +348,10 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw) ret = -EINVAL; break; } - indicators = ldq_phys(ccw.cda); - if (!indicators) { + if (!ccw.cda) { ret = -EFAULT; } else { + indicators = ldq_phys(ccw.cda); dev->indicators2 = indicators; sch->curr_status.scsw.count = ccw.count - sizeof(indicators); ret = 0; -- cgit v1.2.1