linux-kernel - [PATCH][next] media: cxd2880-spi: Fix a null pointer dereference on error handling path

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Message-Id: <20210720160749.73928-1-colin.king@canonical.com>
Date:   Tue, 20 Jul 2021 17:07:49 +0100
From:   Colin King <colin.king@...onical.com>
To:     Yasunari Takiguchi <Yasunari.Takiguchi@...y.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Sean Young <sean@...s.org>, linux-media@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] media: cxd2880-spi: Fix a null pointer dereference on error handling path

From: Colin Ian King <colin.king@...onical.com>

Currently the null pointer check on dvb_spi->vcc_supply is inverted and
this leads to only null values of the dvb_spi->vcc_supply being passed
to the call of regulator_disable causing null pointer dereferences.
Fix this by only calling regulator_disable if dvb_spi->vcc_supply is
not null.

Addresses-Coverity: ("Dereference after null check")
Fixes: dcb014582101 ("media: cxd2880-spi: Fix an error handling path")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/media/spi/cxd2880-spi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/spi/cxd2880-spi.c b/drivers/media/spi/cxd2880-spi.c
index b91a1e845b97..506f52c1af10 100644
--- a/drivers/media/spi/cxd2880-spi.c
+++ b/drivers/media/spi/cxd2880-spi.c
@@ -618,7 +618,7 @@ cxd2880_spi_probe(struct spi_device *spi)
 fail_attach:
 	dvb_unregister_adapter(&dvb_spi->adapter);
 fail_adapter:
-	if (!dvb_spi->vcc_supply)
+	if (dvb_spi->vcc_supply)
 		regulator_disable(dvb_spi->vcc_supply);
 fail_regulator:
 	kfree(dvb_spi);
-- 
2.31.1