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Subject[PATCH v4] ASoC: samsung: i2s: Null pointer dereference on samsung_i2s_remove
Date
If (quirks & QUIRK_SEC_DAI == 0) then samsung_i2s_probe() doesn't allocate
sec_dai and pri_dai->sec_dai remains Null, but samsung_i2s_remove()
performs pri_dai->sec_dai dereference in any case.

The patch removes useless reinitialization of sec_dai at
samsung_i2s_remove(), because resources are under devm control.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Anton Vasilyev <vasilyev@ispras.ru>
---
v2: Drop initialization of sec_dai by NULL at samsung_i2s_remove
as Sylwester Nawrocki suggest.
---
v3: Fix typo in the comment
---
v4: Change comment based on Krzysztof review.
---
sound/soc/samsung/i2s.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c
index af3ba4d..6f896e3 100644
--- a/sound/soc/samsung/i2s.c
+++ b/sound/soc/samsung/i2s.c
@@ -1376,13 +1376,9 @@ static int samsung_i2s_probe(struct platform_device *pdev)

static int samsung_i2s_remove(struct platform_device *pdev)
{
- struct i2s_dai *pri_dai, *sec_dai;
+ struct i2s_dai *pri_dai;

pri_dai = dev_get_drvdata(&pdev->dev);
- sec_dai = pri_dai->sec_dai;
-
- pri_dai->sec_dai = NULL;
- sec_dai->pri_dai = NULL;

pm_runtime_get_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
--
2.7.4
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