ASoC: core: Fix possible NULL pointer dereference

When SSR is triggered when the system does not have a sound card
registered, but has codecs. The pointer card sent from codec driver
to snd_soc_card_change_online_state is NULL. Add null check for soc_card
before dereferencing.

Change-Id: I23342a6cbd9d53e62b2ea11dfe79aad3759df6f0
Signed-off-by: Meng Wang <mwang@codeaurora.org>

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index e63b434..fae57d1 100644 (file)
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3063,7 +3063,8 @@ static int snd_soc_codec_set_bias_level(struct snd_soc_dapm_context *dapm,
  */
 void snd_soc_card_change_online_state(struct snd_soc_card *soc_card, int online)
 {
-       snd_card_change_online_state(soc_card->snd_card, online);
+       if (soc_card && soc_card->snd_card)
+               snd_card_change_online_state(soc_card->snd_card, online);
 }
 EXPORT_SYMBOL(snd_soc_card_change_online_state);