diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index f10bd970d50a741ed1ad1a4d74bfc39708ebf2e7..7667b12f2ff5b0a0a32cd236d6d6e5d970e6cc47 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -423,6 +423,9 @@ alloc_sglist(int nents, int max, int vary)
 	unsigned		i;
 	unsigned		size = max;
 
+	if (max == 0)
+		return NULL;
+
 	sg = kmalloc_array(nents, sizeof *sg, GFP_KERNEL);
 	if (!sg)
 		return NULL;