[PATCH 4.18 075/135] ASoC: rsnd: adg: care clock-frequency size

[Greg Kroah-Hartman]

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kuninori Morimoto <kuninori.morimoto...@renesas.com>

[ Upstream commit 69235ccf491d2e26aefd465c0d3ccd1e3b2a9a9c ]

ADG has buffer over flow bug if DT has more than 3 clock-frequency.
This patch fixup this issue, and uses first 2 values.

        clock-frequency = <x y>;        /* this is OK */
        clock-frequency = <x y z>;      /* this is NG */

Signed-off-by: Kuninori Morimoto <kuninori.morimoto...@renesas.com>
Tested-by: Hiroyuki Yokoyama <hiroyuki.yokoyama...@renesas.com>
Signed-off-by: Mark Brown <broo...@kernel.org>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 sound/soc/sh/rcar/adg.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/sound/soc/sh/rcar/adg.c
+++ b/sound/soc/sh/rcar/adg.c
@@ -465,6 +465,11 @@ static void rsnd_adg_get_clkout(struct r
                goto rsnd_adg_get_clkout_end;
 
        req_size = prop->length / sizeof(u32);
+       if (req_size > REQ_SIZE) {
+               dev_err(dev,
+                       "too many clock-frequency, use top %d\n", REQ_SIZE);
+               req_size = REQ_SIZE;
+       }
 
        of_property_read_u32_array(np, "clock-frequency", req_rate, req_size);
        req_48kHz_rate = 0;