| Message ID | 20211224082103.7658-1-linmq006@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | phy: mediatek: Fix missing check in mtk_mipi_tx_probe | expand |
Il 24/12/21 09:21, Miaoqian Lin ha scritto: > The of_device_get_match_data() function may return NULL. > Add check to prevent potential null dereference. > > Signed-off-by: Miaoqian Lin <linmq006@gmail.com> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
On Fri, 2021-12-24 at 08:21 +0000, Miaoqian Lin wrote: > The of_device_get_match_data() function may return NULL. > Add check to prevent potential null dereference. > > Signed-off-by: Miaoqian Lin <linmq006@gmail.com> > --- > drivers/phy/mediatek/phy-mtk-mipi-dsi.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/phy/mediatek/phy-mtk-mipi-dsi.c > b/drivers/phy/mediatek/phy-mtk-mipi-dsi.c > index 28ad9403c441..67b005d5b9e3 100644 > --- a/drivers/phy/mediatek/phy-mtk-mipi-dsi.c > +++ b/drivers/phy/mediatek/phy-mtk-mipi-dsi.c > @@ -146,6 +146,8 @@ static int mtk_mipi_tx_probe(struct > platform_device *pdev) > return -ENOMEM; > > mipi_tx->driver_data = of_device_get_match_data(dev); > + if (!mipi_tx->driver_data) > + return -ENODEV; > > mipi_tx->regs = devm_platform_ioremap_resource(pdev, 0); > if (IS_ERR(mipi_tx->regs)) Acked-by: Chunfeng Yun <chunfeng.yun@mediatek.com> Thanks
Hi, Miaoqian: Miaoqian Lin <linmq006@gmail.com> 於 2021年12月24日 週五 下午4:21寫道： > > The of_device_get_match_data() function may return NULL. > Add check to prevent potential null dereference. > > Signed-off-by: Miaoqian Lin <linmq006@gmail.com> > --- > drivers/phy/mediatek/phy-mtk-mipi-dsi.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/phy/mediatek/phy-mtk-mipi-dsi.c b/drivers/phy/mediatek/phy-mtk-mipi-dsi.c > index 28ad9403c441..67b005d5b9e3 100644 > --- a/drivers/phy/mediatek/phy-mtk-mipi-dsi.c > +++ b/drivers/phy/mediatek/phy-mtk-mipi-dsi.c > @@ -146,6 +146,8 @@ static int mtk_mipi_tx_probe(struct platform_device *pdev) > return -ENOMEM; > > mipi_tx->driver_data = of_device_get_match_data(dev); > + if (!mipi_tx->driver_data) I'm confused. mtk_mipi_tx_probe() is called because this device node's compatible match one in mtk_mipi_tx_match[]. So I think the return value of of_device_get_match_data(dev) would not be NULL. If this is true, this checking is redundant. Regards, Chun-Kuang. > + return -ENODEV; > > mipi_tx->regs = devm_platform_ioremap_resource(pdev, 0); > if (IS_ERR(mipi_tx->regs)) > -- > 2.17.1 >
Hi, Chun-Kuang: On Fri, Dec 31, 2021 at 12:31:33AM +0800, Chun-Kuang Hu wrote: > > diff --git a/drivers/phy/mediatek/phy-mtk-mipi-dsi.c b/drivers/phy/mediatek/phy-mtk-mipi-dsi.c > > index 28ad9403c441..67b005d5b9e3 100644 > > --- a/drivers/phy/mediatek/phy-mtk-mipi-dsi.c > > +++ b/drivers/phy/mediatek/phy-mtk-mipi-dsi.c > > @@ -146,6 +146,8 @@ static int mtk_mipi_tx_probe(struct platform_device *pdev) > > return -ENOMEM; > > > > mipi_tx->driver_data = of_device_get_match_data(dev); > > + if (!mipi_tx->driver_data) > > I'm confused. mtk_mipi_tx_probe() is called because this device node's > compatible match one in mtk_mipi_tx_match[]. So I think the return > value of of_device_get_match_data(dev) would not be NULL. If this is > true, this checking is redundant. > I think your are right, this checking is redundant. Thanks for your reply. Regards, Miaoqian.
diff --git a/drivers/phy/mediatek/phy-mtk-mipi-dsi.c b/drivers/phy/mediatek/phy-mtk-mipi-dsi.c index 28ad9403c441..67b005d5b9e3 100644 --- a/drivers/phy/mediatek/phy-mtk-mipi-dsi.c +++ b/drivers/phy/mediatek/phy-mtk-mipi-dsi.c @@ -146,6 +146,8 @@ static int mtk_mipi_tx_probe(struct platform_device *pdev) return -ENOMEM; mipi_tx->driver_data = of_device_get_match_data(dev); + if (!mipi_tx->driver_data) + return -ENODEV; mipi_tx->regs = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(mipi_tx->regs))
The of_device_get_match_data() function may return NULL. Add check to prevent potential null dereference. Signed-off-by: Miaoqian Lin <linmq006@gmail.com> --- drivers/phy/mediatek/phy-mtk-mipi-dsi.c | 2 ++ 1 file changed, 2 insertions(+)