ALSA: bebob: potential info leak in hwdep_read()
commitb41c15f4e1
upstream. The "count" variable needs to be capped on every path so that we don't copy too much information to the user. Fixes:618eabeae7
("ALSA: bebob: Add hwdep interface") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20201007074928.GA2529578@mwanda Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -36,12 +36,11 @@ hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
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}
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memset(&event, 0, sizeof(event));
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count = min_t(long, count, sizeof(event.lock_status));
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if (bebob->dev_lock_changed) {
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event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
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event.lock_status.status = (bebob->dev_lock_count > 0);
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bebob->dev_lock_changed = false;
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count = min_t(long, count, sizeof(event.lock_status));
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}
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spin_unlock_irq(&bebob->lock);
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