if the device returns page 0xb1 with length 8 (happens with qemu v2.x, for
example), sd_read_block_characteristics() may attempt an out-of-bounds
memory access when accessing the zoned field at offset 8.
Fixes: 7fb019c46eee ("scsi: sd: Switch to using scsi_device VPD pages")
Signed-off-by: Martin Wilck <mwilck@xxxxxxxx>
---
drivers/scsi/sd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 9db86943d04c..9513406ad640 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3404,7 +3404,7 @@ static void sd_read_block_characteristics(struct scsi_disk *sdkp,
rcu_read_lock();
vpd = rcu_dereference(sdkp->device->vpd_pgb1);
- if (!vpd || vpd->len < 8) {
+ if (!vpd || vpd->len <= 8) {
rcu_read_unlock();
return;
}
--
2.46.0
