linux-kernel - [RESEND v4 4/4] usb: dwc3: qcom: Improve error handling

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Date:   Mon, 17 Jun 2019 13:51:05 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     alokc@...eaurora.org, agross@...nel.org, david.brown@...aro.org,
        bjorn.andersson@...aro.org, balbi@...nel.org,
        gregkh@...uxfoundation.org, ard.biesheuvel@...aro.org,
        jlhugo@...il.com, linux-arm-msm@...r.kernel.org,
        linux-usb@...r.kernel.org, felipe.balbi@...ux.intel.com
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Lee Jones <lee.jones@...aro.org>
Subject: [RESEND v4 4/4] 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>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...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 2d050303d564..c59e9d8e8609 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -409,6 +409,9 @@ static int dwc3_qcom_clk_init(struct dwc3_qcom *qcom, int count)
 	if (!np || !count)
 		return 0;
 
+	if (count < 0)
+		return count;
+
 	qcom->num_clocks = count;
 
 	qcom->clks = devm_kcalloc(dev, qcom->num_clocks,
-- 
2.17.1