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

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Date:   Tue,  4 Jun 2019 11:44:55 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     alokc@...eaurora.org, kramasub@...eaurora.org,
        andy.gross@...aro.org, david.brown@...aro.org,
        wsa+renesas@...g-engineering.com, bjorn.andersson@...aro.org,
        linus.walleij@...aro.org, balbi@...nel.org,
        gregkh@...uxfoundation.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        jlhugo@...il.com, linux-i2c@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-usb@...r.kernel.org, Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 8/8] usb: dwc3: qcom: Improve error handling

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@...aro.org>
---
 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