of/irq: Refer to actual buffer size in of_irq_parse_one()

[ Upstream commit 39ab331ab5d377a18fbf5a0e0b228205edfcc7f4 ]

Replace two open-coded calculations of the buffer size by invocations of
sizeof() on the buffer itself, to make sure the code will always use the
actual buffer size.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/817c0b9626fd30790fc488c472a3398324cfcc0c.1724156125.git.geert+renesas@glider.be
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index ad0cb49e233ac7d2af6dc61429cdb7864041655b..70ac9cb3b2c67dbd2a8f8535b09453719ccb6fd0 100644 (file)
--- 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);