From: Marek Vasut <marex@xxxxxxx>
commit 9bdd10d57a8807dba0003af0325191f3cec0f11c upstream.
While the $val/$val2 values passed in from userspace are always >= 0
integers, the limits of the control can be signed integers and the $min
can be non-zero and less than zero. To correctly validate $val/$val2
against platform_max, add the $min offset to val first.
Fixes: 817f7c9335ec0 ("ASoC: ops: Reject out of bounds values in snd_soc_put_volsw()")
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20220215130645.164025-1-marex@xxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/soc/soc-ops.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/sound/soc/soc-ops.c
+++ b/sound/soc/soc-ops.c
@@ -323,7 +323,7 @@ int snd_soc_put_volsw(struct snd_kcontro
mask = BIT(sign_bit + 1) - 1;
val = ucontrol->value.integer.value[0];
- if (mc->platform_max && val > mc->platform_max)
+ if (mc->platform_max && ((int)val + min) > mc->platform_max)
return -EINVAL;
if (val > max - min)
return -EINVAL;
@@ -336,7 +336,7 @@ int snd_soc_put_volsw(struct snd_kcontro
val = val << shift;
if (snd_soc_volsw_is_stereo(mc)) {
val2 = ucontrol->value.integer.value[1];
- if (mc->platform_max && val2 > mc->platform_max)
+ if (mc->platform_max && ((int)val2 + min) > mc->platform_max)
return -EINVAL;
if (val2 > max - min)
return -EINVAL;
