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ASoC: codecs: wcd937x-sdw: Correct Soundwire ports mask

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Device has up to WCD937X_MAX_TX_SWR_PORTS (or WCD937X_MAX_SWR_PORTS
for sink) number of ports and the array assigned to prop.src_dpn_prop
and prop.sink_dpn_prop has 0..WCD937X_MAX_TX_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 WCD937X_MAX_TX_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: c99a515ff153 ("ASoC: codecs: wcd937x-sdw: add SoundWire driver")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20240726-asoc-wcd-wsa-swr-ports-genmask-v1-1-d4d7a8b56f05@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Krzysztof Kozlowski 2024-07-26 16:10:41 +02:00 committed by Mark Brown
parent 8400291e28
commit aebb1813c2
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 2 additions and 2 deletions
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4
sound/soc/codecs/wcd937x-sdw.c
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@ -1049,7 +1049,7 @@ static int wcd9370_probe(struct sdw_slave *pdev,
pdev->prop.lane_control_support = true;
pdev->prop.simple_clk_stop_capable = true;
if (wcd->is_tx) {
pdev->prop.source_ports = GENMASK(WCD937X_MAX_TX_SWR_PORTS, 0);
pdev->prop.source_ports = GENMASK(WCD937X_MAX_TX_SWR_PORTS - 1, 0);
pdev->prop.src_dpn_prop = wcd937x_dpn_prop;
wcd->ch_info = &wcd937x_sdw_tx_ch_info[0];
pdev->prop.wake_capable = true;
@ -1062,7 +1062,7 @@ static int wcd9370_probe(struct sdw_slave *pdev,
/* Start in cache-only until device is enumerated */
regcache_cache_only(wcd->regmap, true);
} else {
pdev->prop.sink_ports = GENMASK(WCD937X_MAX_SWR_PORTS, 0);
pdev->prop.sink_ports = GENMASK(WCD937X_MAX_SWR_PORTS - 1, 0);
pdev->prop.sink_dpn_prop = wcd937x_dpn_prop;
wcd->ch_info = &wcd937x_sdw_rx_ch_info[0];
}