diff --git a/sys/dev/raid/hptrr/hptrr_osm_bsd.c b/sys/dev/raid/hptrr/hptrr_osm_bsd.c
--- a/sys/dev/raid/hptrr/hptrr_osm_bsd.c
+++ b/sys/dev/raid/hptrr/hptrr_osm_bsd.c
@@ -1263,7 +1263,7 @@
 		}
 
 		if (ioctl_args.nOutBufferSize) {
-			ioctl_args.lpOutBuffer = kmalloc(ioctl_args.nOutBufferSize, M_DEVBUF, M_WAITOK);
+			ioctl_args.lpOutBuffer = kmalloc(ioctl_args.nOutBufferSize, M_DEVBUF, M_WAITOK | M_ZERO);
 			if (!ioctl_args.lpOutBuffer)
 				goto invalid;
 		}