ASoC: ops: Reject out of bounds values in snd_soc_put_volsw()

commit 817f7c9335ec01e0f5e8caffc4f1dcd5e458a4c0 upstream.

We don't currently validate that the values being set are within the range
we advertised to userspace as being valid, do so and reject any values
that are out of range.

Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20220124153253.3548853-2-broonie@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/soc/soc-ops.c b/sound/soc/soc-ops.c
index 08eaa9ddf191e7adee120c3e7e46fe055e16ba11..fbe5d326b0f2db7ff864d39a9ff79797d769a08b 100644 (file)
--- a/sound/soc/soc-ops.c
+++ b/sound/soc/soc-ops.c
@@ -316,13 +316,27 @@ int snd_soc_put_volsw(struct snd_kcontrol *kcontrol,
        if (sign_bit)
                mask = BIT(sign_bit + 1) - 1;
 
-       val = ((ucontrol->value.integer.value[0] + min) & mask);
+       val = ucontrol->value.integer.value[0];
+       if (mc->platform_max && val > mc->platform_max)
+               return -EINVAL;
+       if (val > max - min)
+               return -EINVAL;
+       if (val < 0)
+               return -EINVAL;
+       val = (val + min) & mask;
        if (invert)
                val = max - val;
        val_mask = mask << shift;
        val = val << shift;
        if (snd_soc_volsw_is_stereo(mc)) {
-               val2 = ((ucontrol->value.integer.value[1] + min) & mask);
+               val2 = ucontrol->value.integer.value[1];
+               if (mc->platform_max && val2 > mc->platform_max)
+                       return -EINVAL;
+               if (val2 > max - min)
+                       return -EINVAL;
+               if (val2 < 0)
+                       return -EINVAL;
+               val2 = (val2 + min) & mask;
                if (invert)
                        val2 = max - val2;
                if (reg == reg2) {