If 'micfil->quality' received from micfil_quality_set() somehow ends
up with an unpredictable value, switch() operator will fail to
initialize local variable qsel before regmap_update_bits() tries
to utilize it.

While it is unlikely, play it safe and enable a default case that
returns -EINVAL error.

Found by Linux Verification Center (linuxtesting.org) with static
analysis tool SVACE.

Fixes: bea1d61d5892 ("ASoC: fsl_micfil: rework quality setting")
Cc: stable@vger.kernel.org
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
---
 sound/soc/fsl/fsl_micfil.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/fsl/fsl_micfil.c b/sound/soc/fsl/fsl_micfil.c
index 8c15389c9a04..5585f4c8f455 100644
--- a/sound/soc/fsl/fsl_micfil.c
+++ b/sound/soc/fsl/fsl_micfil.c
@@ -157,6 +157,8 @@ static int micfil_set_quality(struct fsl_micfil *micfil)
 	case QUALITY_VLOW2:
 		qsel = MICFIL_QSEL_VLOW2_QUALITY;
 		break;
+	default:
+		return -EINVAL;
 	}
 
 	return regmap_update_bits(micfil->regmap, REG_MICFIL_CTRL2,

On Thu, 16 Jan 2025 06:24:36 -0800, Nikita Zhandarovich wrote:
> If 'micfil->quality' received from micfil_quality_set() somehow ends
> up with an unpredictable value, switch() operator will fail to
> initialize local variable qsel before regmap_update_bits() tries
> to utilize it.
> 
> While it is unlikely, play it safe and enable a default case that
> returns -EINVAL error.
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: fsl_micfil: Enable default case in micfil_set_quality()
      commit: a8c9a453387640dbe45761970f41301a6985e7fa

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark