diff options
| author | Pierre Morel <pmorel@linux.ibm.com> | 2021-04-08 18:32:09 +0200 |
|---|---|---|
| committer | Cornelia Huck <cohuck@redhat.com> | 2021-04-09 10:52:13 +0200 |
| commit | d895d25ae2bb8519aa715dd2a97f09d4a66b189d (patch) | |
| tree | 9f4fd5f816733abef00401752f049af92c0da713 /hw/s390x/css.c | |
| parent | d8724020dd13c88a72fc391a6a2cf63abbd3dcca (diff) | |
s390x: css: report errors from ccw_dstream_read/write
ccw_dstream_read/write functions returned values are sometime
not taking into account and reported back to the upper level
of interpretation of CCW instructions.
It follows that accessing an invalid address does not trigger
a subchannel status program check to the guest as it should.
Let's test the return values of ccw_dstream_write[_buf] and
ccw_dstream_read[_buf] and report it to the caller.
Cc: qemu-stable@nongnu.org
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Acked-by: Halil Pasic <pasic@linux.ibm.com>
Message-Id: <1617899529-9329-2-git-send-email-pmorel@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Diffstat (limited to 'hw/s390x/css.c')
| -rw-r--r-- | hw/s390x/css.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/hw/s390x/css.c b/hw/s390x/css.c index fe47751df4..4149b8e5a7 100644 --- a/hw/s390x/css.c +++ b/hw/s390x/css.c @@ -1055,10 +1055,11 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr, } } len = MIN(ccw.count, sizeof(sch->sense_data)); - ccw_dstream_write_buf(&sch->cds, sch->sense_data, len); + ret = ccw_dstream_write_buf(&sch->cds, sch->sense_data, len); sch->curr_status.scsw.count = ccw_dstream_residual_count(&sch->cds); - memset(sch->sense_data, 0, sizeof(sch->sense_data)); - ret = 0; + if (!ret) { + memset(sch->sense_data, 0, sizeof(sch->sense_data)); + } break; case CCW_CMD_SENSE_ID: { @@ -1083,9 +1084,10 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr, } else { sense_id[0] = 0; } - ccw_dstream_write_buf(&sch->cds, sense_id, len); - sch->curr_status.scsw.count = ccw_dstream_residual_count(&sch->cds); - ret = 0; + ret = ccw_dstream_write_buf(&sch->cds, sense_id, len); + if (!ret) { + sch->curr_status.scsw.count = ccw_dstream_residual_count(&sch->cds); + } break; } case CCW_CMD_TIC: |