diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2020-10-07 10:49:28 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-10-29 09:57:25 +0100 |
| commit | 8bedcbceaaa37f4362b8fb21e8c9d275e6cbe3a2 (patch) | |
| tree | c2264c664583aa1f1928a437d36de1552c3f6557 /sound | |
| parent | 401d4d79a8ed5ac1c78031a00f8ac414e6605a38 (diff) | |
ALSA: bebob: potential info leak in hwdep_read()
commit b41c15f4e1c1f1657da15c482fa837c1b7384452 upstream.
The "count" variable needs to be capped on every path so that we don't
copy too much information to the user.
Fixes: 618eabeae711 ("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>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/firewire/bebob/bebob_hwdep.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/sound/firewire/bebob/bebob_hwdep.c b/sound/firewire/bebob/bebob_hwdep.c index 45b740f44c45..c362eb38ab90 100644 --- a/sound/firewire/bebob/bebob_hwdep.c +++ b/sound/firewire/bebob/bebob_hwdep.c @@ -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); |