diff --git a/include/trace/events/smbus.h b/include/trace/events/smbus.h
index 71a87edfc46dda00ddf22a8358cb35bbb072a15e..e306d8b928c3810ec7284a1e1567a5d742d99175 100644
--- a/include/trace/events/smbus.h
+++ b/include/trace/events/smbus.h
@@ -57,6 +57,8 @@ TRACE_EVENT_CONDITION(smbus_write,
 		case I2C_SMBUS_I2C_BLOCK_DATA:
 			__entry->len = data->block[0] + 1;
 		copy:
+			if (__entry->len > I2C_SMBUS_BLOCK_MAX + 2)
+				__entry->len = I2C_SMBUS_BLOCK_MAX + 2;
 			memcpy(__entry->buf, data->block, __entry->len);
 			break;
 		case I2C_SMBUS_QUICK: