linux-kernel - [PATCH] [v2] ASoC: cros_ec_codec: fix uninitialized memory read

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Message-Id: <20201204083624.2711356-1-arnd@kernel.org>
Date:   Fri,  4 Dec 2020 09:36:11 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Cheng-Yi Chiang <cychiang@...omium.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Tzung-Bi Shih <tzungbi@...gle.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Guenter Roeck <groeck@...omium.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ard Biesheuvel <ardb@...nel.org>,
        Eric Biggers <ebiggers@...gle.com>,
        Yu-Hsuan Hsu <yuhsuan@...omium.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] ASoC: cros_ec_codec: fix uninitialized memory read

From: Arnd Bergmann <arnd@...db.de>

gcc points out a memory area that is copied to a device
but not initialized:

sound/soc/codecs/cros_ec_codec.c: In function 'i2s_rx_event':
arch/x86/include/asm/string_32.h:83:20: error: '*((void *)&p+4)' may be used uninitialized in this function [-Werror=maybe-uninitialized]
   83 |   *((int *)to + 1) = *((int *)from + 1);

Change the length of the command to only pass down the
part of the structure that has been initialized, as
Tzung-Bi Shih explains that only that member is meant to
be used.

Cc: Tzung-Bi Shih <tzungbi@...gle.com>
Fixes: 727f1c71c780 ("ASoC: cros_ec_codec: refactor I2S RX")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 sound/soc/codecs/cros_ec_codec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/codecs/cros_ec_codec.c b/sound/soc/codecs/cros_ec_codec.c
index 58894bf47514..6ec673573c70 100644
--- a/sound/soc/codecs/cros_ec_codec.c
+++ b/sound/soc/codecs/cros_ec_codec.c
@@ -348,7 +348,7 @@ static int i2s_rx_event(struct snd_soc_dapm_widget *w,
 	}
 
 	return send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,
-				    (uint8_t *)&p, sizeof(p), NULL, 0);
+				    &p.cmd, sizeof(p.cmd), NULL, 0);
 }
 
 static struct snd_soc_dapm_widget i2s_rx_dapm_widgets[] = {
-- 
2.27.0