Validation of signed input should be done before casting to unsigned int.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Signed-off-by: Alexey Khoroshilov khoroshilov@ispras.ru Suggested-by: Mark Brown broonie@kernel.org Fixes: 2fbe467bcbfc ("ASoC: max98090: Reject invalid values in custom control put()") --- sound/soc/codecs/max98090.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/sound/soc/codecs/max98090.c b/sound/soc/codecs/max98090.c index 62b41ca050a2..5513acd360b8 100644 --- a/sound/soc/codecs/max98090.c +++ b/sound/soc/codecs/max98090.c @@ -393,7 +393,8 @@ static int max98090_put_enab_tlv(struct snd_kcontrol *kcontrol, struct soc_mixer_control *mc = (struct soc_mixer_control *)kcontrol->private_value; unsigned int mask = (1 << fls(mc->max)) - 1; - unsigned int sel = ucontrol->value.integer.value[0]; + int sel_unchecked = ucontrol->value.integer.value[0]; + unsigned int sel; unsigned int val = snd_soc_component_read(component, mc->reg); unsigned int *select;
@@ -413,8 +414,9 @@ static int max98090_put_enab_tlv(struct snd_kcontrol *kcontrol,
val = (val >> mc->shift) & mask;
- if (sel < 0 || sel > mc->max) + if (sel_unchecked < 0 || sel_unchecked > mc->max) return -EINVAL; + sel = sel_unchecked;
*select = sel;