linux-kernel - [PATCH] pwm: sun4i: fix a possible NULL dereference

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Message-Id: <1447314132-29458-1-git-send-email-clabbe.montjoie@gmail.com>
Date:	Thu, 12 Nov 2015 08:42:12 +0100
From:	LABBE Corentin <clabbe.montjoie@...il.com>
To:	linux-arm-kernel@...ts.infradead.org,
	maxime.ripard@...e-electrons.com, thierry.reding@...il.com,
	wens@...e.org
Cc:	LABBE Corentin <clabbe.montjoie@...il.com>,
	linux-kernel@...r.kernel.org, linux-pwm@...r.kernel.org
Subject: [PATCH] pwm: sun4i: fix a possible NULL dereference

of_match_device could return NULL, and so cause a NULL pointer
dereference later.

Reported-by: coverity (CID 1324139)
Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
---
 drivers/pwm/pwm-sun4i.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c
index cd9dde5..3011fcc 100644
--- a/drivers/pwm/pwm-sun4i.c
+++ b/drivers/pwm/pwm-sun4i.c
@@ -291,6 +291,8 @@ static int sun4i_pwm_probe(struct platform_device *pdev)
 	const struct of_device_id *match;
 
 	match = of_match_device(sun4i_pwm_dt_ids, &pdev->dev);
+	if (!match)
+		return -ENODEV;
 
 	pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
 	if (!pwm)
-- 
2.4.10

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