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ALSA: pcm: Zero-clear reserved fields of PCM status ioctl in compat mode 

commit 317168d0c7 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: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Takashi Iwai 2014-10-28 12:42:19 +01:00 committed by Zefan Li
parent 358105b826
commit ad82ca3bfb
1 changed files with 2 additions and 0 deletions
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2
sound/core/pcm_compat.c
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@ -204,6 +204,8 @@ 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) ||
put_user(status.trigger_tstamp.tv_sec, &src->trigger_tstamp.tv_sec) ||
put_user(status.trigger_tstamp.tv_nsec, &src->trigger_tstamp.tv_nsec) ||