Messages in this thread Patch in this message | | | From | lizf@kernel ... | Subject | [PATCH 3.4 108/177] ALSA: pcm: Zero-clear reserved fields of PCM status ioctl in compat mode | Date | Wed, 28 Jan 2015 12:09:26 +0800 |
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From: Takashi Iwai <tiwai@suse.de>
3.4.106-rc1 review patch. If anyone has any objections, please let me know.
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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: Zefan Li <lizefan@huawei.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 91cdf94..4dbb66e 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) || -- 1.9.1
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