linux-kernel - [PATCH 4.9 12/19] ASoC: ops: Validate input values in snd_soc_put_volsw

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Message-Id: <20220516193613.863630546@linuxfoundation.org>
Date:   Mon, 16 May 2022 21:36:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 12/19] ASoC: ops: Validate input values in snd_soc_put_volsw_range()

From: Mark Brown <broonie@...nel.org>

[ Upstream commit aa22125c57f9e577f0a667e4fa07fc3fa8ca1e60 ]

Check that values written via snd_soc_put_volsw_range() are
within the range advertised by the control, ensuring that we
don't write out of spec values to the hardware.

Signed-off-by: Mark Brown <broonie@...nel.org>
Link: https://lore.kernel.org/r/20220423131239.3375261-1-broonie@kernel.org
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/soc-ops.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/sound/soc/soc-ops.c b/sound/soc/soc-ops.c
index 74968ddee49f..90ba5521c189 100644
--- a/sound/soc/soc-ops.c
+++ b/sound/soc/soc-ops.c
@@ -528,7 +528,15 @@ int snd_soc_put_volsw_range(struct snd_kcontrol *kcontrol,
 	unsigned int mask = (1 << fls(max)) - 1;
 	unsigned int invert = mc->invert;
 	unsigned int val, val_mask;
-	int err, ret;
+	int err, ret, tmp;
+
+	tmp = ucontrol->value.integer.value[0];
+	if (tmp < 0)
+		return -EINVAL;
+	if (mc->platform_max && tmp > mc->platform_max)
+		return -EINVAL;
+	if (tmp > mc->max - mc->min + 1)
+		return -EINVAL;
 
 	if (invert)
 		val = (max - ucontrol->value.integer.value[0]) & mask;
@@ -543,6 +551,14 @@ int snd_soc_put_volsw_range(struct snd_kcontrol *kcontrol,
 	ret = err;
 
 	if (snd_soc_volsw_is_stereo(mc)) {
+		tmp = ucontrol->value.integer.value[1];
+		if (tmp < 0)
+			return -EINVAL;
+		if (mc->platform_max && tmp > mc->platform_max)
+			return -EINVAL;
+		if (tmp > mc->max - mc->min + 1)
+			return -EINVAL;
+
 		if (invert)
 			val = (max - ucontrol->value.integer.value[1]) & mask;
 		else
-- 
2.35.1