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ASoC: dapm: Fix NULL pointer dereference when registering card with widgets 

Commit 0bd2ac3dae ("ASoC: Remove CODEC pointer from snd_soc_dapm_context")
introduced regression to snd_soc_dapm_new_controls() when registering a card
with card->dapm_widgets set. Call chain is:

    snd_soc_register_card()
    -> snd_soc_instantiate_card()
       -> snd_soc_dapm_new_controls()
          -> snd_soc_dapm_new_control()

Null pointer dereference occurs since card->dapm context doesn't have
associated component. Fix this by setting widget codec pointer
conditionally.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jarkko Nikula 2014-10-03 15:32:40 +03:00 committed by Mark Brown
parent 0bd2ac3dae
commit b2d9de549c
1 changed files with 2 additions and 1 deletions
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3
sound/soc/soc-dapm.c
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@ -3107,7 +3107,8 @@ snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
}
w->dapm = dapm;
w->codec = dapm->component->codec;
if (dapm->component)
w->codec = dapm->component->codec;
INIT_LIST_HEAD(&w->sources);
INIT_LIST_HEAD(&w->sinks);
INIT_LIST_HEAD(&w->list);