[PATCH] iio: dac: fix off-by-one comparison and out-of-bounds write

[Colin King]

From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

The check on reg is off-by-one, it should be >= rather than >. Fix
this to stop an out-of-bounds write to st->channel_modes[reg].

Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
---
 drivers/iio/dac/ad5592r-base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/dac/ad5592r-base.c b/drivers/iio/dac/ad5592r-base.c
index 948f600..69bde59 100644
--- a/drivers/iio/dac/ad5592r-base.c
+++ b/drivers/iio/dac/ad5592r-base.c
@@ -525,7 +525,7 @@ static int ad5592r_alloc_channels(struct ad5592r_state *st)
 
 	device_for_each_child_node(st->dev, child) {
 		ret = fwnode_property_read_u32(child, "reg", &reg);
-		if (ret || reg > ARRAY_SIZE(st->channel_modes))
+		if (ret || reg >= ARRAY_SIZE(st->channel_modes))
 			continue;
 
 		ret = fwnode_property_read_u32(child, "adi,mode", &tmp);
-- 
2.8.1