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ALSA: bebob: potential info leak in hwdep_read() 

commit b41c15f4e1 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>
5.4-rM2-2.2.x-imx-squashed
Dan Carpenter 2020-10-07 10:49:28 +03:00 committed by Greg Kroah-Hartman
parent 401d4d79a8
commit 8bedcbceaa
1 changed files with 1 additions and 2 deletions
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3
sound/firewire/bebob/bebob_hwdep.c
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@ -36,12 +36,11 @@ hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
}
memset(&event, 0, sizeof(event));
count = min_t(long, count, sizeof(event.lock_status));
if (bebob->dev_lock_changed) {
event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
event.lock_status.status = (bebob->dev_lock_count > 0);
bebob->dev_lock_changed = false;
count = min_t(long, count, sizeof(event.lock_status));
}
spin_unlock_irq(&bebob->lock);