[PATCH 8/8] usb: dwc3: qcom: Improve error handling

[Lee Jones]

dwc3_qcom_clk_init() is called with of_count_phandle_with_args() as an
argument.  If of_count_phandle_with_args() returns an error, the number
of clocks will be a negative value and will lead to undefined behaviour.

Ensure we check for an error before attempting to blindly use the value.

Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
---
 drivers/usb/dwc3/dwc3-qcom.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index f21fdd6cdd1a..633482926497 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -419,6 +419,9 @@ static int dwc3_qcom_clk_init(struct dwc3_qcom *qcom, int count)
 	if (!count || ACPI_HANDLE(dev))
 		return 0;
 
+	if (count < 0)
+		return count;
+
 	qcom->clks = devm_kcalloc(dev, qcom->num_clocks,
 				  sizeof(struct clk *), GFP_KERNEL);
 	if (!qcom->clks)
-- 
2.17.1