6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Justin Yeh [ Upstream commit 9c650317ba553d297f3fc5f0ae40ec53d86f9dab ] The gpio_chip is allocated with device-managed memory but registered with the non-managed gpiochip_add_data(). This was harmless while the drivers were built-in, but once they can be built as modules and unbound/rmmod'd, devm frees the gpio_chip's memory while it is still registered, causing a use-after-free. Register it with devm_gpiochip_add_data() so it shares the same device-managed lifecycle, which also lets the manual gpiochip_remove() error paths go away. Fixes: a6df410d420a ("pinctrl: mediatek: Add Pinctrl/GPIO driver for mt8135.") Fixes: 805250982bb5 ("pinctrl: mediatek: add pinctrl-paris that implements the vendor dt-bindings") Fixes: e78d57b2f87c ("pinctrl: mediatek: add pinctrl-moore that implements the generic pinctrl dt-bindings") Signed-off-by: Justin Yeh Reviewed-by: Chen-Yu Tsai Signed-off-by: Linus Walleij Signed-off-by: Sasha Levin --- drivers/pinctrl/mediatek/pinctrl-moore.c | 6 ++---- drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 14 ++++---------- drivers/pinctrl/mediatek/pinctrl-paris.c | 2 +- 3 files changed, 7 insertions(+), 15 deletions(-) diff --git a/drivers/pinctrl/mediatek/pinctrl-moore.c b/drivers/pinctrl/mediatek/pinctrl-moore.c index aad4891223d3e..f24df94c49185 100644 --- a/drivers/pinctrl/mediatek/pinctrl-moore.c +++ b/drivers/pinctrl/mediatek/pinctrl-moore.c @@ -573,7 +573,7 @@ static int mtk_build_gpiochip(struct mtk_pinctrl *hw) chip->base = -1; chip->ngpio = hw->soc->npins; - ret = gpiochip_add_data(chip, hw); + ret = devm_gpiochip_add_data(hw->dev, chip, hw); if (ret < 0) return ret; @@ -587,10 +587,8 @@ static int mtk_build_gpiochip(struct mtk_pinctrl *hw) if (!of_property_present(hw->dev->of_node, "gpio-ranges")) { ret = gpiochip_add_pin_range(chip, dev_name(hw->dev), 0, 0, chip->ngpio); - if (ret < 0) { - gpiochip_remove(chip); + if (ret < 0) return ret; - } } return 0; diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c index efc9b07e62658..cee2dffd57e7a 100644 --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c @@ -1118,30 +1118,24 @@ int mtk_pctrl_init(struct platform_device *pdev, pctl->chip->parent = &pdev->dev; pctl->chip->base = -1; - ret = gpiochip_add_data(pctl->chip, pctl); + ret = devm_gpiochip_add_data(&pdev->dev, pctl->chip, pctl); if (ret) return -EINVAL; /* Register the GPIO to pin mappings. */ ret = gpiochip_add_pin_range(pctl->chip, dev_name(&pdev->dev), 0, 0, pctl->devdata->npins); - if (ret) { - ret = -EINVAL; - goto chip_error; - } + if (ret) + return -EINVAL; /* Only initialize EINT if we have EINT pins */ if (data->eint_hw.ap_num > 0) { ret = mtk_eint_init(pctl, pdev); if (ret) - goto chip_error; + return ret; } return 0; - -chip_error: - gpiochip_remove(pctl->chip); - return ret; } int mtk_pctrl_common_probe(struct platform_device *pdev) diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c index 87e958d827bf9..363a02106d401 100644 --- a/drivers/pinctrl/mediatek/pinctrl-paris.c +++ b/drivers/pinctrl/mediatek/pinctrl-paris.c @@ -970,7 +970,7 @@ static int mtk_build_gpiochip(struct mtk_pinctrl *hw) chip->base = -1; chip->ngpio = hw->soc->npins; - ret = gpiochip_add_data(chip, hw); + ret = devm_gpiochip_add_data(hw->dev, chip, hw); if (ret < 0) return ret; -- 2.53.0