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ASoC: core: Fix possible NULL pointer dereference

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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>
This commit is contained in:
Meng Wang 2017-08-07 12:05:24 +08:00 committed by Gerrit - the friendly Code Review server
parent 9a9fb3e2cd
commit a2ce4cbbe3
1 changed files with 2 additions and 1 deletions
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sound/soc/soc-core.c
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@ -2933,6 +2933,7 @@ EXPORT_SYMBOL_GPL(snd_soc_lookup_component);
*/ */
void snd_soc_card_change_online_state(struct snd_soc_card *soc_card, int online) void snd_soc_card_change_online_state(struct snd_soc_card *soc_card, int online)
{ {
if (soc_card && soc_card->snd_card)
snd_card_change_online_state(soc_card->snd_card, online); snd_card_change_online_state(soc_card->snd_card, online);
} }
EXPORT_SYMBOL(snd_soc_card_change_online_state); EXPORT_SYMBOL(snd_soc_card_change_online_state);