linux-kernel - [PATCH] ASoC: codecs: wsa-macro: fix uninitialized stack variables with name prefix

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Date:   Tue,  3 Oct 2023 17:54:22 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Banajit Goswami <bgoswami@...cinc.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        stable@...r.kernel.org
Subject: [PATCH] ASoC: codecs: wsa-macro: fix uninitialized stack variables with name prefix

Driver compares widget name in wsa_macro_spk_boost_event() widget event
callback, however it does not handle component's name prefix.  This
leads to using uninitialized stack variables as registers and register
values.  Handle gracefully such case.

Fixes: 2c4066e5d428 ("ASoC: codecs: lpass-wsa-macro: add dapm widgets and route")
Cc: <stable@...r.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

---

This is a fix only for uninitialized values case.  The fix for including
name prefixes will be sent separate, because I think it is not a stable
material.  Happy to combine patches if needed.
---
 sound/soc/codecs/lpass-wsa-macro.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/codecs/lpass-wsa-macro.c b/sound/soc/codecs/lpass-wsa-macro.c
index ec6859ec0d38..ea6e3fa7e9e1 100644
--- a/sound/soc/codecs/lpass-wsa-macro.c
+++ b/sound/soc/codecs/lpass-wsa-macro.c
@@ -1685,6 +1685,9 @@ static int wsa_macro_spk_boost_event(struct snd_soc_dapm_widget *w,
 		boost_path_cfg1 = CDC_WSA_RX1_RX_PATH_CFG1;
 		reg = CDC_WSA_RX1_RX_PATH_CTL;
 		reg_mix = CDC_WSA_RX1_RX_PATH_MIX_CTL;
+	} else {
+		dev_warn(component->dev, "Incorrect widget name in the driver\n");
+		return -EINVAL;
 	}
 
 	switch (event) {
-- 
2.34.1