linux-kernel - [PATCH 3.4 75/92] ALSA: synth: Fix conflicting OSS device registration on AWE32

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1460976397-5688-75-git-send-email-lizf@kernel.org>
Date:	Mon, 18 Apr 2016 18:46:20 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 75/92] ALSA: synth: Fix conflicting OSS device registration on AWE32

From: Takashi Iwai <tiwai@...e.de>

3.4.112-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 225db5762dc1a35b26850477ffa06e5cd0097243 upstream.

When OSS emulation is loaded on ISA SB AWE32 chip, we get now kernel
warnings like:
  WARNING: CPU: 0 PID: 2791 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x51/0x80()
  sysfs: cannot create duplicate filename '/devices/isa/sbawe.0/sound/card0/seq-oss-0-0'

It's because both emux synth and opl3 drivers try to register their
OSS device object with the same static index number 0.  This hasn't
been a big problem until the recent rewrite of device management code
(that exposes sysfs at the same time), but it's been an obvious bug.

This patch works around it just by using a different index number of
emux synth object.  There can be a more elegant way to fix, but it's
enough for now, as this code won't be touched so often, in anyway.

Reported-and-tested-by: Michael Shell <list1@...haelshell.org>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 sound/synth/emux/emux_oss.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/synth/emux/emux_oss.c b/sound/synth/emux/emux_oss.c
index daf61ab..646b667 100644
--- a/sound/synth/emux/emux_oss.c
+++ b/sound/synth/emux/emux_oss.c
@@ -69,7 +69,8 @@ snd_emux_init_seq_oss(struct snd_emux *emu)
 	struct snd_seq_oss_reg *arg;
 	struct snd_seq_device *dev;
 
-	if (snd_seq_device_new(emu->card, 0, SNDRV_SEQ_DEV_ID_OSS,
+	/* using device#1 here for avoiding conflicts with OPL3 */
+	if (snd_seq_device_new(emu->card, 1, SNDRV_SEQ_DEV_ID_OSS,
 			       sizeof(struct snd_seq_oss_reg), &dev) < 0)
 		return;
 
-- 
1.9.1