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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@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Lee Jones 2019-06-17 13:51:05 +01:00 committed by Felipe Balbi
parent a6e456209d
commit 7f5d6a4696
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/dwc3/dwc3-qcom.c
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@ -409,6 +409,9 @@ static int dwc3_qcom_clk_init(struct dwc3_qcom *qcom, int count)
if (!np || !count) if (!np || !count)
return 0; return 0;
if (count < 0)
return count;
qcom->num_clocks = count; qcom->num_clocks = count;
qcom->clks = devm_kcalloc(dev, qcom->num_clocks, qcom->clks = devm_kcalloc(dev, qcom->num_clocks,