From 5955adc323822ffe85c2bfd7c7e1224c1bfaca66 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Tue, 28 Oct 2014 12:42:19 +0100 Subject: [PATCH] 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 Signed-off-by: Takashi Iwai Signed-off-by: Ben Hutchings --- sound/core/pcm_compat.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c index 91cdf9435fec..4dbb66ef435d 100644 --- a/sound/core/pcm_compat.c +++ b/sound/core/pcm_compat.c @@ -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) || -- 2.39.2