From 09d23174402da0f10e98da2c61bb5ac8e7d79fdd Mon Sep 17 00:00:00 2001
From: Jaroslav Kysela <perex@perex.cz>
Date: Mon, 20 Sep 2021 19:18:50 +0200
Subject: [PATCH] ALSA: rawmidi: introduce SNDRV_RAWMIDI_IOCTL_USER_PVERSION
Git-commit: 09d23174402da0f10e98da2c61bb5ac8e7d79fdd
Patch-mainline: v5.15-rc4
References: git-fixes stable-5.14.10
The new framing mode causes the user space regression, because
the alsa-lib code does not initialize the reserved space in
the params structure when the device is opened.
This change adds SNDRV_RAWMIDI_IOCTL_USER_PVERSION like we
do for the PCM interface for the protocol acknowledgment.
Cc: David Henningsson <coding@diwic.se>
Cc: <stable@vger.kernel.org>
Fixes: 08fdced60ca0 ("ALSA: rawmidi: Add framing mode")
Buglink: https://github.com/alsa-project/alsa-lib/issues/178
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20210920171850.154186-1-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
include/sound/rawmidi.h | 1 +
include/uapi/sound/asound.h | 1 +
sound/core/rawmidi.c | 9 +++++++++
3 files changed, 11 insertions(+)
diff --git a/include/sound/rawmidi.h b/include/sound/rawmidi.h
index 989e1517332d..7a08ed2acd60 100644
--- a/include/sound/rawmidi.h
+++ b/include/sound/rawmidi.h
@@ -98,6 +98,7 @@ struct snd_rawmidi_file {
struct snd_rawmidi *rmidi;
struct snd_rawmidi_substream *input;
struct snd_rawmidi_substream *output;
+ unsigned int user_pversion; /* supported protocol version */
};
struct snd_rawmidi_str {
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
index 1d84ec9db93b..5859ca0a1439 100644
--- a/include/uapi/sound/asound.h
+++ b/include/uapi/sound/asound.h
@@ -784,6 +784,7 @@ struct snd_rawmidi_status {
#define SNDRV_RAWMIDI_IOCTL_PVERSION _IOR('W', 0x00, int)
#define SNDRV_RAWMIDI_IOCTL_INFO _IOR('W', 0x01, struct snd_rawmidi_info)
+#define SNDRV_RAWMIDI_IOCTL_USER_PVERSION _IOW('W', 0x02, int)
#define SNDRV_RAWMIDI_IOCTL_PARAMS _IOWR('W', 0x10, struct snd_rawmidi_params)
#define SNDRV_RAWMIDI_IOCTL_STATUS _IOWR('W', 0x20, struct snd_rawmidi_status)
#define SNDRV_RAWMIDI_IOCTL_DROP _IOW('W', 0x30, int)
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 6c0a4a67ad2e..6f30231bdb88 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -873,12 +873,21 @@ static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long
return -EINVAL;
}
}
+ case SNDRV_RAWMIDI_IOCTL_USER_PVERSION:
+ if (get_user(rfile->user_pversion, (unsigned int __user *)arg))
+ return -EFAULT;
+ return 0;
+
case SNDRV_RAWMIDI_IOCTL_PARAMS:
{
struct snd_rawmidi_params params;
if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params)))
return -EFAULT;
+ if (rfile->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 2)) {
+ params.mode = 0;
+ memset(params.reserved, 0, sizeof(params.reserved));
+ }
switch (params.stream) {
case SNDRV_RAWMIDI_STREAM_OUTPUT:
if (rfile->output == NULL)
--
2.26.2