From mboxrd@z Thu Jan 1 00:00:00 1970 From: Fabien Parent Subject: [PATCH] i2c: i2c-mt65xx: fix NULL ptr dereference Date: Wed, 25 Sep 2019 22:31:13 +0200 Message-ID: <20190925203113.6972-1-fparent@baylibre.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org Cc: matthias.bgg@gmail.com, wsa@the-dreams.de, qii.wang@mediatek.com, drinkcat@chromium.org, hsinyi@chromium.org, tglx@linutronix.de, Fabien Parent List-Id: linux-mediatek@lists.infradead.org Since commit abf4923e97c3 ("i2c: mediatek: disable zero-length transfers for mt8183"), there is a NULL pointer dereference for all the SoCs that don't have any quirk. mtk_i2c_functionality is not checking that the quirks pointer is not NULL before starting to use it. This commit add a check on the quirk pointer before dereferencing it. Fixes: abf4923e97c3 ("i2c: mediatek: disable zero-length transfers for mt8183") Signed-off-by: Fabien Parent --- drivers/i2c/busses/i2c-mt65xx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index 29eae1bf4f86..ec00fc6af9ae 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -875,7 +875,7 @@ static irqreturn_t mtk_i2c_irq(int irqno, void *dev_id) static u32 mtk_i2c_functionality(struct i2c_adapter *adap) { - if (adap->quirks->flags & I2C_AQ_NO_ZERO_LEN) + if (adap->quirks && adap->quirks->flags & I2C_AQ_NO_ZERO_LEN) return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK); else -- 2.23.0