linux-kernel - [PATCH 5.10 1/1] ASoC: ops: Check for negative values before reading them

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Message-ID: <20250312085829.52758-1-d.privalov@omp.ru>
Date: Wed, 12 Mar 2025 11:58:29 +0300
From: d.privalov <d.privalov@....ru>
To: <stable@...r.kernel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
	<alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
	<lvc-project@...uxtesting.org>, Dmitriy Privalov <d.privalov@....ru>
Subject: [PATCH 5.10 1/1] ASoC: ops: Check for negative values before reading them

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

commit 1601033da2dd2052e0489137f7788a46a8fcd82f upstream.

The controls allow inputs to be specified as negative but our manipulating
them into register fields need to be done on unsigned variables so the
checks for negative numbers weren't taking effect properly. Do the checks
for negative values on the variable in the ABI struct rather than on our
local unsigned copy.

Signed-off-by: Mark Brown <broonie@...nel.org>
Link: https://lore.kernel.org/r/20220128192443.3504823-1-broonie@kernel.org
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Dmitriy Privalov <d.privalov@....ru>
---
 sound/soc/soc-ops.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/sound/soc/soc-ops.c b/sound/soc/soc-ops.c
index a83cd8d8a9633..a1087dfee532d 100644
--- a/sound/soc/soc-ops.c
+++ b/sound/soc/soc-ops.c
@@ -316,26 +316,26 @@ int snd_soc_put_volsw(struct snd_kcontrol *kcontrol,
 	if (sign_bit)
 		mask = BIT(sign_bit + 1) - 1;
 
+	if (ucontrol->value.integer.value[0] < 0)
+		return -EINVAL;
 	val = ucontrol->value.integer.value[0];
 	if (mc->platform_max && ((int)val + min) > mc->platform_max)
 		return -EINVAL;
 	if (val > max - min)
 		return -EINVAL;
-	if (val < 0)
-		return -EINVAL;
 	val = (val + min) & mask;
 	if (invert)
 		val = max - val;
 	val_mask = mask << shift;
 	val = val << shift;
 	if (snd_soc_volsw_is_stereo(mc)) {
+		if (ucontrol->value.integer.value[1] < 0)
+			return -EINVAL;
 		val2 = ucontrol->value.integer.value[1];
 		if (mc->platform_max && ((int)val2 + min) > mc->platform_max)
 			return -EINVAL;
 		if (val2 > max - min)
 			return -EINVAL;
-		if (val2 < 0)
-			return -EINVAL;
 		val2 = (val2 + min) & mask;
 		if (invert)
 			val2 = max - val2;
@@ -429,13 +429,13 @@ int snd_soc_put_volsw_sx(struct snd_kcontrol *kcontrol,
 	int err = 0;
 	unsigned int val, val_mask, val2 = 0;
 
+	if (ucontrol->value.integer.value[0] < 0)
+		return -EINVAL;
 	val = ucontrol->value.integer.value[0];
 	if (mc->platform_max && val > mc->platform_max)
 		return -EINVAL;
 	if (val > max)
 		return -EINVAL;
-	if (val < 0)
-		return -EINVAL;
 	val_mask = mask << shift;
 	val = (val + min) & mask;
 	val = val << shift;
-- 
2.34.1