ASoC: codecs: wcd934x: add a sanity check in set channel map

commit 3bb4852d598f0275ed5996a059df55be7318ac2f upstream.

set channel map can be passed with a channel maps, however if
the number of channels that are passed are more than the actual
supported channels then we would be accessing array out of bounds.

So add a sanity check to validate these numbers!

Fixes: a61f3b4f476e ("ASoC: wcd934x: add support to wcd9340/wcd9341 codec")
Reported-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210309142129.14182-4-srinivas.kandagatla@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/soc/codecs/wcd934x.c b/sound/soc/codecs/wcd934x.c
index 40f682f..d18ae5e 100644 (file)
--- a/sound/soc/codecs/wcd934x.c
+++ b/sound/soc/codecs/wcd934x.c
@@ -1873,6 +1873,12 @@ static int wcd934x_set_channel_map(struct snd_soc_dai *dai,
 
        wcd = snd_soc_component_get_drvdata(dai->component);
 
+       if (tx_num > WCD934X_TX_MAX || rx_num > WCD934X_RX_MAX) {
+               dev_err(wcd->dev, "Invalid tx %d or rx %d channel count\n",
+                       tx_num, rx_num);
+               return -EINVAL;
+       }
+
        if (!tx_slot || !rx_slot) {
                dev_err(wcd->dev, "Invalid tx_slot=%p, rx_slot=%p\n",
                        tx_slot, rx_slot);