[PATCH v5 20/20] media: meson-ir-tx: Prevent divide by zero in meson_irtx_prepare_pulse()

[Sean Young]

If an excesively high carrier is set, meson_irtx_prepare_pulse() will
cause a divide by zero if tb_us is 0. Prevent such a carrier from being
set.

Fixes: 49be1c78d575 ("media: rc: introduce Meson IR TX driver")
Signed-off-by: Sean Young <sean@xxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
 drivers/media/rc/meson-ir-tx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/rc/meson-ir-tx.c b/drivers/media/rc/meson-ir-tx.c
index 1ab898069e67..a0d07da09f67 100644
--- a/drivers/media/rc/meson-ir-tx.c
+++ b/drivers/media/rc/meson-ir-tx.c
@@ -219,6 +219,9 @@ static int meson_irtx_set_carrier(struct rc_dev *rc, u32 carrier)
 	if (carrier == 0)
 		return -EINVAL;
 
+	if (!DIV_ROUND_CLOSEST(USEC_PER_SEC, carrier))
+		return -EINVAL;
+
 	ir->carrier = carrier;
 	meson_irtx_set_mod(ir);
 
-- 
2.55.0