On Thu, Feb 8, 2018 at 4:59 PM, Rafael J. Wysocki <rafael@xxxxxxxxxx> wrote:
> On Wed, Feb 7, 2018 at 3:56 PM, Andy Shevchenko
> <andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:
>> When __acpi_match_device() is called it would be possible to have
>> ACPI ID table a MULL pointer. To avoid potential dereference,
>> check for this before traverse.
>>
>> While here, remove redundant 'else'.
>>
>> Cc: Sinan Kaya <okaya@xxxxxxxxxxxxxx>
>> Cc: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
>> Cc: Vinod Koul <vinod.koul@xxxxxxxxx>
>> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
>> ---
>> drivers/acpi/bus.c | 12 +++++++-----
>> 1 file changed, 7 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
>> index 761286e50067..da7e9cf770a6 100644
>> --- a/drivers/acpi/bus.c
>> +++ b/drivers/acpi/bus.c
>> @@ -752,11 +752,13 @@ static const struct acpi_device_id *__acpi_match_device(
>>
>> list_for_each_entry(hwid, &device->pnp.ids, list) {
>> /* First, check the ACPI/PNP IDs provided by the caller. */
>> - for (id = ids; id->id[0] || id->cls; id++) {
>> - if (id->id[0] && !strcmp((char *) id->id, hwid->id))
>> - return id;
>> - else if (id->cls && __acpi_match_device_cls(id, hwid))
>> - return id;
>> + if (ids) {
>> + for (id = ids; id->id[0] || id->cls; id++) {
>> + if (id->id[0] && !strcmp((char *)id->id, hwid->id))
>> + return id;
>> + if (id->cls && __acpi_match_device_cls(id, hwid))
>> + return id;
>> + }
>> }
>>
>> /*
>> --
>
> The return value below should be updated in *this* patch, because this
> is what allows ids to be NULL in the first place.
>
> And as far as I'm concerned you can do:
>
> if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
Missing paren, sorry.
> return (const struct acpi_device_id
> *)acpi_of_match_device(device, of_ids);
>
> and update the comment accordingly.
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