[libcamera-devel] [PATCH] hal: Fix comparison of unsigned integer < 0

[Jacopo Mondi]

Hi Laurent,
   thanks for the fix

On Thu, Aug 15, 2019 at 03:23:32PM +0300, Laurent Pinchart wrote:
> The CameraHalManager::getCameraInfo() validates the camera id it
> receives from the camera service, and in doing so generates a compiler
> error as the id is an unsigned integer and can never be negative:
>
> ../src/android/camera_hal_manager.cpp: In member function ‘CameraProxy* CameraHalManager::open(unsigned int, const hw_module_t*)’:
> ../src/android/camera_hal_manager.cpp:89:9: error: comparison of unsigned expression < 0 is always false [-Werror=type-limits]
>   if (id < 0 || id >= numCameras()) {
>
> Fix it by removing the unneeded comparison.
>

If relevant please add which compiler reports the error, as on clang-8 it
is not reported. FYI with gcc-9.1 I see it as well.

> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>

Reviewed-by: Jacopo Mondi <jacopo at jmondi.org>

Thanks
  j

> ---
>  src/android/camera_hal_manager.cpp | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/src/android/camera_hal_manager.cpp b/src/android/camera_hal_manager.cpp
> index 1e66f63240da..37ba01355258 100644
> --- a/src/android/camera_hal_manager.cpp
> +++ b/src/android/camera_hal_manager.cpp
> @@ -86,7 +86,7 @@ void CameraHalManager::run()
>  CameraProxy *CameraHalManager::open(unsigned int id,
>  				    const hw_module_t *hardwareModule)
>  {
> -	if (id < 0 || id >= numCameras()) {
> +	if (id >= numCameras()) {
>  		LOG(HAL, Error) << "Invalid camera id '" << id << "'";
>  		return nullptr;
>  	}
> --
> Regards,
>
> Laurent Pinchart
>
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