diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index ccb1f33b634db203d517b07a19c093cd7b3f06b5..082b2695e02f32219002898073e9de0844bf7658 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -5352,6 +5352,11 @@ static int __init scsi_debug_init(void)
 		return -EINVAL;
 	}
 
+	if (sdebug_num_tgts < 0) {
+		pr_err("num_tgts must be >= 0\n");
+		return -EINVAL;
+	}
+
 	if (sdebug_guard > 1) {
 		pr_err("guard must be 0 or 1\n");
 		return -EINVAL;