When soc_init_dai_link() call at the beginning of snd_soc_instantiate_card
function fails soc_cleanup_card_resources() and then snd_soc_dapm_free()
gets called with an incompletely initialized card->dapm. In particular
card->dapm.card is NULL and it gets dereferenced in dapm_free_widgets().
Also dapm->list is invalid and there is an invalid pointer dereference
from list_del().
The function call stack (deferred probing) on Chromebook Snow where this
issue has shown up in today's -next is:
snd_soc_dapm_free
soc_cleanup_card_resources
snd_soc_instantiate_card
snd_soc_register_card
devm_snd_soc_register_card
snow_probe
In patch 70fc53734e71 "ASoC: core: move DAI pre-links initiation to
snd_soc_instantiate_card" there is an soc_cleanup_platform() call instead
of soc_cleanup_card_resources() as in current -next.
soc_cleanup_platform got renamed to soc_cleanup_legacy, then removed
in commit adb76b5b9c47 "ASoC: soc-core: remove legacy style dai_link".
It seems in merge conflict resolution the soc_cleanup_platform() call got
renamed to soc_cleanup_card_resources(), instead of being removed.
Correct this by removing an unnecessary soc_cleanup_card_resources() call.
Fixes: a8e992342ce4 ("Merge branch 'asoc-5.2' into asoc-5.3")
Reported-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Suggested-by: Tzung-Bi Shih <tzungbi@xxxxxxxxxx>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
---
sound/soc/soc-core.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 94a36ee8eb22..f0fa289c90d8 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1986,7 +1986,6 @@ static int snd_soc_instantiate_card(struct snd_soc_card *card)
for_each_card_prelinks(card, i, dai_link) {
ret = soc_init_dai_link(card, dai_link);
if (ret) {
- soc_cleanup_card_resources(card);
dev_err(card->dev, "ASoC: failed to init link %s: %d\n",
dai_link->name, ret);
mutex_unlock(&client_mutex);
--
2.17.1
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