This is a note to let you know that I've just added the patch titled
ALSA: seq: Fix nested rwsem annotation for lockdep splat
to the 4.9-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-nested-rwsem-annotation-for-lockdep-splat.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1f20f9ff57ca23b9f5502fca85ce3977e8496cb1 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@xxxxxxx>
Date: Sun, 29 Oct 2017 11:10:43 +0100
Subject: ALSA: seq: Fix nested rwsem annotation for lockdep splat
From: Takashi Iwai <tiwai@xxxxxxx>
commit 1f20f9ff57ca23b9f5502fca85ce3977e8496cb1 upstream.
syzkaller reported the lockdep splat due to the possible deadlock of
grp->list_mutex of each sequencer client object. Actually this is
rather a false-positive report due to the missing nested lock
annotations. The sequencer client may deliver the event directly to
another client which takes another own lock.
For addressing this issue, this patch replaces the simple down_read()
with down_read_nested(). As a lock subclass, the already existing
"hop" can be re-used, which indicates the depth of the call.
Reference: http://lkml.kernel.org/r/089e082686ac9b482e055c832617@xxxxxxxxxx
Reported-by: syzbot <bot+7feb8de6b4d6bf810cf098bef942cc387e79d0ad@xxxxxxxxxxxxxxxxxxxxxxxxx>
Reported-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/core/seq/seq_clientmgr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -663,7 +663,7 @@ static int deliver_to_subscribers(struct
if (atomic)
read_lock(&grp->list_lock);
else
- down_read(&grp->list_mutex);
+ down_read_nested(&grp->list_mutex, hop);
list_for_each_entry(subs, &grp->list_head, src_list) {
/* both ports ready? */
if (atomic_read(&subs->ref_count) != 2)
Patches currently in stable-queue which might be from tiwai@xxxxxxx are
queue-4.9/alsa-seq-fix-nested-rwsem-annotation-for-lockdep-splat.patch
queue-4.9/alsa-timer-add-missing-mutex-lock-for-compat-ioctls.patch