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chipidea: error on overflow for port_test_write

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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>
This commit is contained in:
Alan 2016-02-15 19:09:46 +00:00 committed by Greg Kroah-Hartman
parent 0ca10122ca
commit 3c724888d2
1 changed files with 3 additions and 0 deletions
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drivers/usb/chipidea/debug.c
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@ -100,6 +100,9 @@ static ssize_t ci_port_test_write(struct file *file, const char __user *ubuf,
if (sscanf(buf, "%u", &mode) != 1)
return -EINVAL;
if (mode > 255)
return -EBADRQC;
pm_runtime_get_sync(ci->dev);
spin_lock_irqsave(&ci->lock, flags);
ret = hw_port_test_set(ci, mode);