This is a note to let you know that I've just added the patch titled
ALSA: hda: Add input value sanity checks to HDMI channel map controls
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-hda-add-input-value-sanity-checks-to-hdmi-chann.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a4f54e602087aae6903d899559d578ba6554a61f
Author: Takashi Iwai <tiwai@xxxxxxx>
Date: Sun Jun 16 09:34:47 2024 +0200
ALSA: hda: Add input value sanity checks to HDMI channel map controls
[ Upstream commit 6278056e42d953e207e2afd416be39d09ed2d496 ]
Add a simple sanity check to HD-audio HDMI Channel Map controls.
Although the value might not be accepted for the actual connection, we
can filter out some bogus values beforehand, and that should be enough
for making kselftest happier.
Reviewed-by: Jaroslav Kysela <perex@xxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Link: https://lore.kernel.org/20240616073454.16512-7-tiwai@xxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/sound/hda/hdmi_chmap.c b/sound/hda/hdmi_chmap.c
index 2efee794cac6..79ccec2da387 100644
--- a/sound/hda/hdmi_chmap.c
+++ b/sound/hda/hdmi_chmap.c
@@ -753,6 +753,20 @@ static int hdmi_chmap_ctl_get(struct snd_kcontrol *kcontrol,
return 0;
}
+/* a simple sanity check for input values to chmap kcontrol */
+static int chmap_value_check(struct hdac_chmap *hchmap,
+ const struct snd_ctl_elem_value *ucontrol)
+{
+ int i;
+
+ for (i = 0; i < hchmap->channels_max; i++) {
+ if (ucontrol->value.integer.value[i] < 0 ||
+ ucontrol->value.integer.value[i] > SNDRV_CHMAP_LAST)
+ return -EINVAL;
+ }
+ return 0;
+}
+
static int hdmi_chmap_ctl_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
@@ -764,6 +778,10 @@ static int hdmi_chmap_ctl_put(struct snd_kcontrol *kcontrol,
unsigned char chmap[8], per_pin_chmap[8];
int i, err, ca, prepared = 0;
+ err = chmap_value_check(hchmap, ucontrol);
+ if (err < 0)
+ return err;
+
/* No monitor is connected in dyn_pcm_assign.
* It's invalid to setup the chmap
*/
