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ALSA: dice: fix null pointer dereference when node is disconnected

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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: e9f21129b8 ("ALSA: dice: support AMDTP domain")
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210312093407.23437-1-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2021-03-12 18:34:07 +09:00 committed by Takashi Iwai
parent 2bf44e0ee9
commit dd7b836d6b
1 changed files with 2 additions and 3 deletions
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5
sound/firewire/dice/dice-stream.c
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@ -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);
}
}