This is a note to let you know that I've just added the patch titled
ALSA: seq: Fix regression by incorrect ioctl_mutex usages
to the 4.4-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-seq-fix-regression-by-incorrect-ioctl_mutex-usages.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From tiwai@xxxxxxx Mon Feb 19 17:39:59 2018
From: Takashi Iwai <tiwai@xxxxxxx>
Date: Mon, 19 Feb 2018 17:16:01 +0100
Subject: ALSA: seq: Fix regression by incorrect ioctl_mutex usages
To: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Andres Bertens <abertensu@xxxxxxxxx>, ben@xxxxxxxxxxxxxxx, stable@xxxxxxxxxxxxxxx
Message-ID: <20180219161601.24110-1-tiwai@xxxxxxx>
From: Takashi Iwai <tiwai@xxxxxxx>
This is the revised backport of the upstream commit
b3defb791b26ea0683a93a4f49c77ec45ec96f10
We had another backport (e.g. 623e5c8ae32b in 4.4.115), but it applies
the new mutex also to the code paths that are invoked via faked
kernel-to-kernel ioctls. As reported recently, this leads to a
deadlock at suspend (or other scenarios triggering the kernel
sequencer client).
This patch addresses the issue by taking the mutex only in the code
paths invoked by user-space, just like the original fix patch does.
Reported-and-tested-by: Andres Bertens <abertensu@xxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
Tagged as 4.4.x, but should be applied to other older kernels, too.
sound/core/seq/seq_clientmgr.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -2196,7 +2196,6 @@ static int snd_seq_do_ioctl(struct snd_s
void __user *arg)
{
struct seq_ioctl_table *p;
- int ret;
switch (cmd) {
case SNDRV_SEQ_IOCTL_PVERSION:
@@ -2210,12 +2209,8 @@ static int snd_seq_do_ioctl(struct snd_s
if (! arg)
return -EFAULT;
for (p = ioctl_tables; p->cmd; p++) {
- if (p->cmd == cmd) {
- mutex_lock(&client->ioctl_mutex);
- ret = p->func(client, arg);
- mutex_unlock(&client->ioctl_mutex);
- return ret;
- }
+ if (p->cmd == cmd)
+ return p->func(client, arg);
}
pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
@@ -2226,11 +2221,15 @@ static int snd_seq_do_ioctl(struct snd_s
static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct snd_seq_client *client = file->private_data;
+ long ret;
if (snd_BUG_ON(!client))
return -ENXIO;
- return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
+ mutex_lock(&client->ioctl_mutex);
+ ret = snd_seq_do_ioctl(client, cmd, (void __user *) arg);
+ mutex_unlock(&client->ioctl_mutex);
+ return ret;
}
#ifdef CONFIG_COMPAT
Patches currently in stable-queue which might be from tiwai@xxxxxxx are
queue-4.4/alsa-seq-fix-regression-by-incorrect-ioctl_mutex-usages.patch