[PATCH v5 3/5] HID: asus: fix a off-by-one in mcu_parse_version_string() validation

[Denis Benato]

In mcu_parse_version_string() a size validation for response is stricter
that it needs to be: relax the check by one byte.

The device always answer with a greater byte count so this does
not introduce visible changes.

Fixes: ("hid-asus: check ROG Ally MCU version and warn")
Signed-off-by: Denis Benato <denis.benato@xxxxxxxxx>
---
 drivers/hid/hid-asus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
index d31e71ce3d19..0fb8cd6437b7 100644
--- a/drivers/hid/hid-asus.c
+++ b/drivers/hid/hid-asus.c
@@ -841,7 +841,7 @@ static int mcu_parse_version_string(const u8 *response, size_t response_size)
 			dots++;
 	}
 
-	if (dots != 2 || p >= end || (p + 3) >= end)
+	if (dots != 2 || end - p < 3)
 		return -EINVAL;
 
 	memcpy(buf, p, 3);
-- 
2.47.3