[PATCH AUTOSEL 6.6 125/139] of/irq: Refer to actual buffer size in of_irq_parse_one()

Sasha Levin
2024-09-25T12:17:36Z

From: Geert Uytterhoeven <geert+renesas@glider.be>

[ 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>
---
drivers/of/irq.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 8fd63100ba8f0..d67b69cb84bfe 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -357,8 +357,8 @@ 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);

--
2.43.0