ALSA: Add a reference counter to card instance

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For more strict protection for wild disconnections, a refcount is
introduced to the card instance, and let it up/down when an object is
referred via snd_lookup_*() in the open ops.

The free-after-last-close check is also changed to check this refcount
instead of the empty list, too.

Reported-by: Matthieu CASTET <matthieu.castet@parrot.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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This commit is contained in:

Takashi Iwai 2012-10-16 13:05:59 +02:00

parent 888ea7d5ac

commit a0830dbd4e

11 changed files with 86 additions and 32 deletions

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9

sound/core/compress_offload.c

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3

sound/core/control.c

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5

sound/core/hwdep.c

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50

sound/core/init.c

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10

sound/core/oss/mixer_oss.c

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2

sound/core/oss/pcm_oss.c

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9

sound/core/pcm_native.c

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6

sound/core/rawmidi.c

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11

sound/core/sound.c

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10

sound/core/sound_oss.c

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