Messages in this thread | | | Date | Sat, 12 Aug 2017 09:10:51 +0200 | From | Krzysztof Kozlowski <> | Subject | Re: [PATCH v3] ASoC: samsung: i2s: Null pointer dereference on samsung_i2s_remove |
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On Fri, Aug 11, 2017 at 04:06:23PM +0300, Anton Vasilyev wrote: > 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 adds sec_dai check on Null before derefence at > samsung_i2s_remove().
No, I think this patch does not any check.
Best regards, Krzysztof
> > 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 > --- > 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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