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| author | Takashi Iwai <tiwai@suse.de> | 2018-04-24 07:26:59 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2018-04-25 10:37:45 +0200 |
| commit | f5e94b4c6ebdabe0f602d796e0430180927521a0 (patch) | |
| tree | bfdc7a9bfc66c8711e52772e5762aed1efec9484 /sound | |
| parent | ab3b8e5159b5335c81ba2d09ee5054d4a1b5a7a6 (diff) | |
| download | linux-0-day-f5e94b4c6ebdabe0f602d796e0430180927521a0.tar.gz linux-0-day-f5e94b4c6ebdabe0f602d796e0430180927521a0.tar.xz | |
ALSA: seq: oss: Fix unbalanced use lock for synth MIDI device
When get_synthdev() is called for a MIDI device, it returns the fixed
midi_synth_dev without the use refcounting. OTOH, the caller is
supposed to unreference unconditionally after the usage, so this would
lead to unbalanced refcount.
This patch corrects the behavior and keep up the refcount balance also
for the MIDI synth device.
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/core/seq/oss/seq_oss_synth.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/sound/core/seq/oss/seq_oss_synth.c b/sound/core/seq/oss/seq_oss_synth.c index cd0e0ebbfdb1a..9e2b250ae7805 100644 --- a/sound/core/seq/oss/seq_oss_synth.c +++ b/sound/core/seq/oss/seq_oss_synth.c @@ -363,10 +363,14 @@ get_synthdev(struct seq_oss_devinfo *dp, int dev) return NULL; if (! dp->synths[dev].opened) return NULL; - if (dp->synths[dev].is_midi) - return &midi_synth_dev; - if ((rec = get_sdev(dev)) == NULL) - return NULL; + if (dp->synths[dev].is_midi) { + rec = &midi_synth_dev; + snd_use_lock_use(&rec->use_lock); + } else { + rec = get_sdev(dev); + if (!rec) + return NULL; + } if (! rec->opened) { snd_use_lock_free(&rec->use_lock); return NULL; |