On Thu, Mar 08, 2018 at 12:06:53PM -0800, Kees Cook wrote: > If a codec is not attached to the sound soc, a NULL deref is possible as a > regular user in /sys. I can't parse this, sorry. What is the "sound soc"? > +++ b/sound/soc/soc-core.c > @@ -137,6 +137,9 @@ static ssize_t soc_codec_reg_show(struct snd_soc_codec *codec, char *buf, > size_t total = 0; > loff_t p = 0; > > + if (!codec || !codec->driver) > + return 0; > + How are we managing to create a sysfs file for a CODEC which doesn't have a CODEC struct associated with it? That is obviously nonsensical and suggests we've got some more serious problem going on here - if there's no CODEC those sysfs attributes simply shouldn't be there.
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