chipidea: error on overflow for port_test_write
The write value is 8bit, but currently writing a larger number (eg a doubled digit) is not errored but instead gets cast and sets off an action probably undesired. Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -100,6 +100,9 @@ static ssize_t ci_port_test_write(struct file *file, const char __user *ubuf,
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if (sscanf(buf, "%u", &mode) != 1)
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return -EINVAL;
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if (mode > 255)
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return -EBADRQC;
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pm_runtime_get_sync(ci->dev);
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spin_lock_irqsave(&ci->lock, flags);
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ret = hw_port_test_set(ci, mode);
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