ASoC: rt286: Fix potencial crash in jd function

We assign rt286->codec in rt286_probe. If rt286_jack_detect is
invoked before rt286_probe, rt286->codec will be NULL and cause
a kernel panic.

Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/sound/soc/codecs/rt286.c b/sound/soc/codecs/rt286.c
index 847cc4b9bee5..f14d335b07b1 100644
--- a/sound/soc/codecs/rt286.c
+++ b/sound/soc/codecs/rt286.c
@@ -305,6 +305,8 @@ static int rt286_jack_detect(struct rt286_priv *rt286, bool *hp, bool *mic)
         *hp = false;
         *mic = false;
 
+        if (!rt286->codec)
+                return -EINVAL;
         if (rt286->pdata.cbj_en) {
                 regmap_read(rt286->regmap, RT286_GET_HP_SENSE, &buf);
                 *hp = buf & 0x80000000;