diff options
Diffstat (limited to 'hw/s390x/css.c')
| -rw-r--r-- | hw/s390x/css.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/hw/s390x/css.c b/hw/s390x/css.c index 6a42b95cee..1880b1a0ff 100644 --- a/hw/s390x/css.c +++ b/hw/s390x/css.c @@ -795,6 +795,10 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr, if (!ccw_addr) { return -EIO; } + /* Check doubleword aligned and 31 or 24 (fmt 0) bit addressable. */ + if (ccw_addr & (sch->ccw_fmt_1 ? 0x80000007 : 0xff000007)) { + return -EINVAL; + } /* Translate everything to format-1 ccws - the information is the same. */ ccw = copy_ccw_from_guest(ccw_addr, sch->ccw_fmt_1); @@ -881,7 +885,8 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr, ret = -EINVAL; break; } - if (ccw.flags & (CCW_FLAG_CC | CCW_FLAG_DC)) { + if (ccw.flags || ccw.count) { + /* We have already sanitized these if converted from fmt 0. */ ret = -EINVAL; break; } |