| From | Kamal Mostafa <> | Subject | [PATCH 3.13 141/162] ALSA: pcm: Zero-clear reserved fields of PCM status ioctl in compat mode | Date | Thu, 6 Nov 2014 14:36:45 -0800 |
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3.13.11.11 -stable review patch. If anyone has any objections, please let me know.
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From: Takashi Iwai <tiwai@suse.de>
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: Kamal Mostafa <kamal@canonical.com> --- 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 af49721..c4ac3c1 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) || -- 1.9.1
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