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From: Takashi Sakamoto <o-takashi@sakamocchi.jp>
To: tiwai@suse.de, perex@perex.cz
Cc: clemens@ladisch.de, alsa-devel@alsa-project.org,
	ffado-devel@lists.sourceforge.net, stable@vger.kernel.org
Subject: [PATCH] ALSA: dice: fix null pointer dereference when node is disconnected
Date: Fri, 12 Mar 2021 18:34:07 +0900	[thread overview]
Message-ID: <20210312093407.23437-1-o-takashi@sakamocchi.jp> (raw)

When node is removed from IEEE 1394 bus, any transaction fails to the node.
In the case, ALSA dice driver doesn't stop isochronous contexts even if
they are running. As a result, null pointer dereference occurs in callback
from the running context.

This commit fixes the bug to release isochronous contexts always.

Cc: <stable@vger.kernel.org> # v5.4 or later
Fixes: e9f21129b8d8 ("ALSA: dice: support AMDTP domain")
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/dice/dice-stream.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/sound/firewire/dice/dice-stream.c b/sound/firewire/dice/dice-stream.c
index 8e0c0380b4c4..1a14c083e8ce 100644
--- a/sound/firewire/dice/dice-stream.c
+++ b/sound/firewire/dice/dice-stream.c
@@ -493,11 +493,10 @@ void snd_dice_stream_stop_duplex(struct snd_dice *dice)
 	struct reg_params tx_params, rx_params;
 
 	if (dice->substreams_counter == 0) {
-		if (get_register_params(dice, &tx_params, &rx_params) >= 0) {
-			amdtp_domain_stop(&dice->domain);
+		if (get_register_params(dice, &tx_params, &rx_params) >= 0)
 			finish_session(dice, &tx_params, &rx_params);
-		}
 
+		amdtp_domain_stop(&dice->domain);
 		release_resources(dice);
 	}
 }
-- 
2.27.0


WARNING: multiple messages have this Message-ID (diff)
From: Takashi Sakamoto <o-takashi@sakamocchi.jp>
To: tiwai@suse.de, perex@perex.cz
Cc: ffado-devel@lists.sourceforge.net, alsa-devel@alsa-project.org,
	clemens@ladisch.de, stable@vger.kernel.org
Subject: [PATCH] ALSA: dice: fix null pointer dereference when node is disconnected
Date: Fri, 12 Mar 2021 18:34:07 +0900	[thread overview]
Message-ID: <20210312093407.23437-1-o-takashi@sakamocchi.jp> (raw)

When node is removed from IEEE 1394 bus, any transaction fails to the node.
In the case, ALSA dice driver doesn't stop isochronous contexts even if
they are running. As a result, null pointer dereference occurs in callback
from the running context.

This commit fixes the bug to release isochronous contexts always.

Cc: <stable@vger.kernel.org> # v5.4 or later
Fixes: e9f21129b8d8 ("ALSA: dice: support AMDTP domain")
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/dice/dice-stream.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/sound/firewire/dice/dice-stream.c b/sound/firewire/dice/dice-stream.c
index 8e0c0380b4c4..1a14c083e8ce 100644
--- a/sound/firewire/dice/dice-stream.c
+++ b/sound/firewire/dice/dice-stream.c
@@ -493,11 +493,10 @@ void snd_dice_stream_stop_duplex(struct snd_dice *dice)
 	struct reg_params tx_params, rx_params;
 
 	if (dice->substreams_counter == 0) {
-		if (get_register_params(dice, &tx_params, &rx_params) >= 0) {
-			amdtp_domain_stop(&dice->domain);
+		if (get_register_params(dice, &tx_params, &rx_params) >= 0)
 			finish_session(dice, &tx_params, &rx_params);
-		}
 
+		amdtp_domain_stop(&dice->domain);
 		release_resources(dice);
 	}
 }
-- 
2.27.0


             reply	other threads:[~2021-03-12  9:35 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-12  9:34 Takashi Sakamoto [this message]
2021-03-12  9:34 ` [PATCH] ALSA: dice: fix null pointer dereference when node is disconnected Takashi Sakamoto
2021-03-12 13:13 ` Takashi Iwai
2021-03-12 13:13   ` Takashi Iwai

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