>From 8dfd143c2e05405bc1f61107c5858eab9c5fc847 Mon Sep 17 00:00:00 2001
From: Alan Young <consult.awy@xxxxxxxxx>
Date: Mon, 8 Nov 2021 12:39:56 -0500
Subject: [PATCH] ALSA: ctl: Fix copy of updated id with element read/write
When control_compat.c:copy_ctl_value_to_user() is used, by
ctl_elem_read_user() & ctl_elem_write_user(), it must also copy back the
snd_ctl_elem_id value that may have been updated (filled in) by the call
to snd_ctl_elem_read/snd_ctl_elem_write().
This matches the functionality provided by snd_ctl_elem_read_user() and
snd_ctl_elem_write_user(), via snd_ctl_build_ioff().
Without this, and without making additional calls to snd_ctl_info()
which are unnecessary when using the non-compat calls, a userspace
application will not know the numid value for the element and
consequently will not be able to use the poll/read interface on the
control file to determine which elements have updates.
Signed-off-by: Alan Young <consult.awy@xxxxxxxxx>
---
sound/core/control_compat.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/sound/core/control_compat.c b/sound/core/control_compat.c
index 470dabc60aa0..edff063e088d 100644
--- a/sound/core/control_compat.c
+++ b/sound/core/control_compat.c
@@ -264,6 +264,7 @@ static int copy_ctl_value_to_user(void __user *userdata,
struct snd_ctl_elem_value *data,
int type, int count)
{
+ struct snd_ctl_elem_value32 __user *data32 = userdata;
int i, size;
if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
@@ -280,6 +281,8 @@ static int copy_ctl_value_to_user(void __user *userdata,
if (copy_to_user(valuep, data->value.bytes.data, size))
return -EFAULT;
}
+ if (copy_to_user(&data32->id, &data->id, sizeof(data32->id)))
+ return -EFAULT;
return 0;
}
--
2.25.1
