[PATCH] hidclass.sys: fixed size passed IOCTL_HID_GET_INPUT_REPORT (Coverity)

[Sebastian Lackner]

On 17.10.2015 14:52, Marcus Meissner wrote:
> 1327477 Wrong sizeof argument
> 
> Signed-off-by: Marcus Meissner <marcus at jet.franken.de>
> ---
>  dlls/hidclass.sys/device.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/dlls/hidclass.sys/device.c b/dlls/hidclass.sys/device.c
> index e7e7e11..dcc7d3c 100644
> --- a/dlls/hidclass.sys/device.c
> +++ b/dlls/hidclass.sys/device.c
> @@ -277,7 +277,7 @@ static DWORD CALLBACK hid_device_thread(void *args)
>              packet->reportId = 0;
>  
>              irp = IoBuildDeviceIoControlRequest(IOCTL_HID_GET_INPUT_REPORT,
> -                device, NULL, 0, packet, sizeof(packet), TRUE, events[0],
> +                device, NULL, 0, packet, sizeof(*packet)+ext->preparseData->caps.InputReportByteLength, TRUE, events[0],
>                  &irp_status);
>  
>              irpsp = IoGetNextIrpStackLocation(irp);
> 

This looks wrong, you have to allocate a separate buffer, and then copy it (like in the code below).
I don't know why some of these buffers are HEAP_ZERO_MEMORY though, and others not? Adding Aric, he
might want to review this part again, especially since Coverity detected more issues in this code
(unnecessary assignment of "rc" for example).