linux-kernel - [PATCH][next] ASoC: rt-sdw-common: Fix bit-wise or'ing of values into uninitialized variable ret

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Message-Id: <20241008164707.203792-1-colin.i.king@gmail.com>
Date: Tue,  8 Oct 2024 17:47:07 +0100
From: Colin Ian King <colin.i.king@...il.com>
To: Oder Chiou <oder_chiou@...ltek.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Jack Yu <jack.yu@...ltek.com>,
	linux-sound@...r.kernel.org
Cc: kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH][next] ASoC: rt-sdw-common: Fix bit-wise or'ing of values into uninitialized variable ret

There are a handful of bit-wise or'ing of values into the uninitialized
variable ret resulting in garbage results. Fix this by ininitializing
ret to zero.

Fixes: bbca8e7050e0 ("ASoC: rt-sdw-common: Common functions for Realtek soundwire driver")
Signed-off-by: Colin Ian King <colin.i.king@...il.com>
---
 sound/soc/codecs/rt-sdw-common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/codecs/rt-sdw-common.c b/sound/soc/codecs/rt-sdw-common.c
index 9ed0e9855699..a422da6cf702 100644
--- a/sound/soc/codecs/rt-sdw-common.c
+++ b/sound/soc/codecs/rt-sdw-common.c
@@ -101,21 +101,21 @@ EXPORT_SYMBOL_GPL(rt_sdca_index_update_bits);
  * rt_sdca_btn_type - Decision of button type.
  *
  * @buffer: UMP message buffer.
  *
  * A button type will be returned regarding to buffer,
  * it returns zero if buffer cannot be recognized.
  */
 int rt_sdca_btn_type(unsigned char *buffer)
 {
 	u8 btn_type = 0;
-	int ret;
+	int ret = 0;
 
 	btn_type |= buffer[0] & 0xf;
 	btn_type |= (buffer[0] >> 4) & 0xf;
 	btn_type |= buffer[1] & 0xf;
 	btn_type |= (buffer[1] >> 4) & 0xf;
 
 	if (btn_type & BIT(0))
 		ret |= SND_JACK_BTN_2;
 	if (btn_type & BIT(1))
 		ret |= SND_JACK_BTN_3;
-- 
2.39.5