diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index ad0cb49e233a..70ac9cb3b2c6 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -301,8 +301,8 @@ int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_ar
 	addr = of_get_property(device, "reg", &addr_len);
 
 	/* Prevent out-of-bounds read in case of longer interrupt parent address size */
-	if (addr_len > (3 * sizeof(__be32)))
-		addr_len = 3 * sizeof(__be32);
+	if (addr_len > sizeof(addr_buf))
+		addr_len = sizeof(addr_buf);
 	if (addr)
 		memcpy(addr_buf, addr, addr_len);