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 90acdf4d90ed6054606e17cffbd7b934cd01d958..fe7fe1f15432e0cc5a096d01ec5461046531c5fa 100644 (file)
--- a/sound/soc/soc-ops.c
+++ b/sound/soc/soc-ops.c
@@ -327,13 +327,27 @@ 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) {