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@xxxxxxxxx>
---
If you think this warrants a Fixes-tag:
Fixes: b739dffa5d570b41 ("of/irq: Prevent device address out-of-bounds read in interrupt map walk")
---
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 cc30b471e446045a..36351ad6115eb10e 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);
--
2.34.1
