linux-kernel - [PATCH] ASoC: samsung: i2s: Null pointer dereference on samsung_i2s

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Date:   Thu, 10 Aug 2017 18:56:39 +0300
From:   Anton Vasilyev <vasilyev@...ras.ru>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Anton Vasilyev <vasilyev@...ras.ru>,
        Sangbeom Kim <sbkim73@...sung.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH] ASoC: samsung: i2s: Null pointer dereference on samsung_i2s_remove

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()
permorms pri_dai->sec_dai dereference in any case.

The patch adds sec_dai check on Null before derefence at
samsung_i2s_remove().

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

Signed-off-by: Anton Vasilyev <vasilyev@...ras.ru>
---
 sound/soc/samsung/i2s.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c
index af3ba4d..6beeea8 100644
--- a/sound/soc/samsung/i2s.c
+++ b/sound/soc/samsung/i2s.c
@@ -1382,7 +1382,8 @@ static int samsung_i2s_remove(struct platform_device *pdev)
 	sec_dai = pri_dai->sec_dai;
 
 	pri_dai->sec_dai = NULL;
-	sec_dai->pri_dai = NULL;
+	if (sec_dai)
+		sec_dai->pri_dai = NULL;
 
 	pm_runtime_get_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
-- 
2.7.4