If the total number of zones on a drive is calculated to a value that
is less than the number of zones it can actually report, zone info
buffer can be overrun. This may happen not only due to drive firmware
problems, but also because of underlying software incorrectly
reporting zoned device capacity.
Fix this by more carefully setting zone report size.
Signed-off-by: Dmitry Fomichev <dmitry.fomichev@xxxxxxx>
---
zbd.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/zbd.c b/zbd.c
index 048fdbd0..52cd7b8b 100644
--- a/zbd.c
+++ b/zbd.c
@@ -526,8 +526,9 @@ static int parse_zone_info(struct thread_data *td, struct fio_file *f)
offset = z->start + z->len;
if (j >= nr_zones)
break;
- nrz = zbd_report_zones(td, f, offset,
- zones, ZBD_REPORT_MAX_ZONES);
+ nrz = zbd_report_zones(td, f, offset, zones,
+ min((uint32_t)(nr_zones - j),
+ ZBD_REPORT_MAX_ZONES));
if (nrz < 0) {
ret = nrz;
log_info("fio: report zones (offset %llu) failed for %s (%d).\n",
--
2.21.0
