5.4-stable review patch. If anyone has any objections, please let me know.
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From: Krzysztof Kozlowski krzysztof.kozlowski@linaro.org
commit ddfcfeba891064b88bb844208b43bef2ef970f0c upstream.
The probe function never performs any paltform device allocation, thus error path "undo_platform_dev_alloc" is entirely bogus. It drops the reference count from the platform device being probed. If error path is triggered, this will lead to unbalanced device reference counts and premature release of device resources, thus possible use-after-free when releasing remaining devm-managed resources.
Fixes: f83fca0707c6 ("usb: dwc3: add ST dwc3 glue layer to manage dwc3 HC") Cc: stable@vger.kernel.org Signed-off-by: Krzysztof Kozlowski krzysztof.kozlowski@linaro.org Acked-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Reviewed-by: Patrice Chotard patrice.chotard@foss.st.com Link: https://lore.kernel.org/r/20240814093957.37940-1-krzysztof.kozlowski@linaro.... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/dwc3/dwc3-st.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-)
--- a/drivers/usb/dwc3/dwc3-st.c +++ b/drivers/usb/dwc3/dwc3-st.c @@ -219,10 +219,8 @@ static int st_dwc3_probe(struct platform dwc3_data->regmap = regmap;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "syscfg-reg"); - if (!res) { - ret = -ENXIO; - goto undo_platform_dev_alloc; - } + if (!res) + return -ENXIO;
dwc3_data->syscfg_reg_off = res->start;
@@ -233,8 +231,7 @@ static int st_dwc3_probe(struct platform devm_reset_control_get_exclusive(dev, "powerdown"); if (IS_ERR(dwc3_data->rstc_pwrdn)) { dev_err(&pdev->dev, "could not get power controller\n"); - ret = PTR_ERR(dwc3_data->rstc_pwrdn); - goto undo_platform_dev_alloc; + return PTR_ERR(dwc3_data->rstc_pwrdn); }
/* Manage PowerDown */ @@ -300,8 +297,6 @@ undo_softreset: reset_control_assert(dwc3_data->rstc_rst); undo_powerdown: reset_control_assert(dwc3_data->rstc_pwrdn); -undo_platform_dev_alloc: - platform_device_put(pdev); return ret; }