[PATCH] USB storage: avoid NULL-ptr OOPS

This patch will avoid a NULL-pointer dereference OOPS which is caused by
oddly-formed (yet legal) INQUIRY commands that request 0 bytes.

drivers/usb/storage/protocol.c

@@ -82,6 +82,10 @@ static void fix_inquiry_data(Scsi_Cmnd *srb)
 	if (srb->cmnd[0] != INQUIRY)
 		return;
 
+	/* oddly short buffer -- bail out */
+	if (srb->request_bufflen < 3)
+		return;
+
 	data_ptr = find_data_location(srb);
 
 	if ((data_ptr[2] & 7) == 2)