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SubjectRe: [PATCH] HID: logitech-dj: fix unintentional integer overflow on left shift
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On 08/02/2021 15:06, Dan Carpenter wrote:
> On Sun, Feb 07, 2021 at 11:21:20PM +0000, Colin King wrote:
>> From: Colin Ian King <colin.king@canonical.com>
>>
>> Shifting the integer value 1 is evaluated using 32-bit rithmetic
>> and then used in an expression that expects a 64-bit value, so
>> there is potentially an integer overflow. Fix this by using th
>> BIT_ULL macro to perform the shift and avoid the overflow.
>>
>> Addresses-Coverity: ("Uninitentional integer overflow")
>> Fixes: 534a7b8e10ec ("HID: Add full support for Logitech Unifying receivers")
>> Signed-off-by: Colin Ian King <colin.king@canonical.com>
>> ---
>> drivers/hid/hid-logitech-dj.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
>> index 45e7e0bdd382..747f41be0603 100644
>> --- a/drivers/hid/hid-logitech-dj.c
>> +++ b/drivers/hid/hid-logitech-dj.c
>> @@ -1035,7 +1035,7 @@ static void logi_dj_recv_forward_null_report(struct dj_receiver_dev *djrcv_dev,
>> memset(reportbuffer, 0, sizeof(reportbuffer));
>>
>> for (i = 0; i < NUMBER_OF_HID_REPORTS; i++) {
> ^^^^^^^^^^^^^^^^^^^^^
> This is 32, so it can't be undefined.

Urgh, looks like coverity is being overly pedantic here. :-(

>
>> - if (djdev->reports_supported & (1 << i)) {
>> + if (djdev->reports_supported & BIT_ULL(i)) {
>> reportbuffer[0] = i;
>> if (hid_input_report(djdev->hdev,
>> HID_INPUT_REPORT,
>
> regards,
> dan carpenter
>

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