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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 08:59:48 -0800 |
| commit | 203eb06d99656f2a291a75e41e1fee20ef8e3a14 (patch) | |
| tree | 18a5bc6c8367849a6b0b1d90fd654c49369278db /sound | |
| parent | 76e40745855feef9f52456b764a46742e625ee4c (diff) | |
| download | lwn-203eb06d99656f2a291a75e41e1fee20ef8e3a14.tar.gz lwn-203eb06d99656f2a291a75e41e1fee20ef8e3a14.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>
Diffstat (limited to 'sound')
| -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 af49721ba0e3..c4ac3c1e19af 100644 --- a/sound/core/pcm_compat.c +++ b/sound/core/pcm_compat.c @@ -206,6 +206,8 @@ 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) || |