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| author | Takashi Iwai <tiwai@suse.de> | 2014-10-28 12:42:19 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-14 10:10:24 -0800 |
| commit | 23ab9b6bb4f1c3a4a5de58e521e5a26110d12f7c (patch) | |
| tree | ebccd47fc2c47f487e42a57fc2513c9dab0c878f | |
| parent | 99ec7002716eb5b34aa28ea1a7368d1b606e5916 (diff) | |
| download | lwn-23ab9b6bb4f1c3a4a5de58e521e5a26110d12f7c.tar.gz lwn-23ab9b6bb4f1c3a4a5de58e521e5a26110d12f7c.zip | |
ALSA: pcm: Zero-clear reserved fields of PCM status ioctl in compat mode
commit 317168d0c766defd14b3d0e9c2c4a9a258b803ee upstream.
In compat mode, we copy each field of snd_pcm_status struct but don't
touch the reserved fields, and this leaves uninitialized values
there. Meanwhile the native ioctl does zero-clear the whole
structure, so we should follow the same rule in compat mode, too.
Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | sound/core/pcm_compat.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c index 102e8fd1d450..2d957ba63557 100644 --- a/sound/core/pcm_compat.c +++ b/sound/core/pcm_compat.c @@ -210,6 +210,8 @@ static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream, if (err < 0) return err; + if (clear_user(src, sizeof(*src))) + return -EFAULT; if (put_user(status.state, &src->state) || compat_put_timespec(&status.trigger_tstamp, &src->trigger_tstamp) || compat_put_timespec(&status.tstamp, &src->tstamp) || |