linux-kernel - [PATCH 4/6] ASoC: codecs: wsa881x: Correct Soundwire ports mask

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Message-Id: <20240726-asoc-wcd-wsa-swr-ports-genmask-v1-4-d4d7a8b56f05@linaro.org>
Date: Fri, 26 Jul 2024 16:10:44 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, 
 Mohammad Rafi Shaik <quic_mohs@...cinc.com>, 
 Prasad Kumpatla <quic_pkumpatl@...cinc.com>, 
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Banajit Goswami <bgoswami@...cinc.com>, 
 Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org, 
 alsa-devel@...a-project.org, linux-arm-msm@...r.kernel.org
Subject: [PATCH 4/6] ASoC: codecs: wsa881x: Correct Soundwire ports mask

Device has up to WSA881X_MAX_SWR_PORTS number of ports and the array
assigned to prop.sink_dpn_prop has 0..WSA881X_MAX_SWR_PORTS-1 elements.
On the other hand, GENMASK(high, low) creates an inclusive mask between
<high, low>, so we need the mask from 0 up to WSA881X_MAX_SWR_PORTS-1.

Theoretically, too wide mask could cause an out of bounds read in
sdw_get_slave_dpn_prop() in stream.c, however only in the case of buggy
driver, e.g. adding incorrect number of ports via
sdw_stream_add_slave().

Fixes: a0aab9e1404a ("ASoC: codecs: add wsa881x amplifier support")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

---

Not adding Cc-stable because I don't think the issue can lead to real
out-of-bounds read.
---
 sound/soc/codecs/wsa881x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/codecs/wsa881x.c b/sound/soc/codecs/wsa881x.c
index 0478599d0f35..fb9e92f08d98 100644
--- a/sound/soc/codecs/wsa881x.c
+++ b/sound/soc/codecs/wsa881x.c
@@ -1152,7 +1152,7 @@ static int wsa881x_probe(struct sdw_slave *pdev,
 	wsa881x->sconfig.frame_rate = 48000;
 	wsa881x->sconfig.direction = SDW_DATA_DIR_RX;
 	wsa881x->sconfig.type = SDW_STREAM_PDM;
-	pdev->prop.sink_ports = GENMASK(WSA881X_MAX_SWR_PORTS, 0);
+	pdev->prop.sink_ports = GENMASK(WSA881X_MAX_SWR_PORTS - 1, 0);
 	pdev->prop.sink_dpn_prop = wsa_sink_dpn_prop;
 	pdev->prop.scp_int1_mask = SDW_SCP_INT1_BUS_CLASH | SDW_SCP_INT1_PARITY;
 	pdev->prop.clk_stop_mode1 = true;

-- 
2.43.0