[libcamera-devel] [PATCH] hal: Fix comparison of integers of different signs

[Jacopo Mondi]

Hi Laurent,

On Mon, Aug 12, 2019 at 02:04:47PM +0300, Laurent Pinchart wrote:
> The CameraHalManager::getCameraInfo() validates the camera id it
> receives from the camera service, and in doing so compares it with an
> unsigned integer, generating a compiler error:
>
> src/android/camera_hal_manager.cpp:121:9: error: comparison of integers of different signs: 'int' and 'unsigned int' [-Werror,-Wsign-compare]
>         if (id >= numCameras() || id < 0) {
>             ~~ ^  ~~~~~~~~~~~~
>
> Fix this by turning the id into an unsigned int, as camera ids can't be
> negative. If a negative id is received from the camera service it will
> be converted to a large unsigned integer that will fail the comparison
> with numCameras().

My bad, I missed it!
Thanks for fixing

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

Thanks
  j

>
> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> ---
>  src/android/camera_hal_manager.cpp | 4 ++--
>  src/android/camera_hal_manager.h   | 2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/src/android/camera_hal_manager.cpp b/src/android/camera_hal_manager.cpp
> index 08c759dfd8a1..1e66f63240da 100644
> --- a/src/android/camera_hal_manager.cpp
> +++ b/src/android/camera_hal_manager.cpp
> @@ -113,12 +113,12 @@ unsigned int CameraHalManager::numCameras() const
>  	return cameraManager_->cameras().size();
>  }
>
> -int CameraHalManager::getCameraInfo(int id, struct camera_info *info)
> +int CameraHalManager::getCameraInfo(unsigned int id, struct camera_info *info)
>  {
>  	if (!info)
>  		return -EINVAL;
>
> -	if (id >= numCameras() || id < 0) {
> +	if (id >= numCameras()) {
>  		LOG(HAL, Error) << "Invalid camera id '" << id << "'";
>  		return -EINVAL;
>  	}
> diff --git a/src/android/camera_hal_manager.h b/src/android/camera_hal_manager.h
> index 8004aaf660f5..8228623aba90 100644
> --- a/src/android/camera_hal_manager.h
> +++ b/src/android/camera_hal_manager.h
> @@ -30,7 +30,7 @@ public:
>  	int close(CameraProxy *proxy);
>
>  	unsigned int numCameras() const;
> -	int getCameraInfo(int id, struct camera_info *info);
> +	int getCameraInfo(unsigned int id, struct camera_info *info);
>
>  private:
>  	void run() override;
> --
> Regards,
>
> Laurent Pinchart
>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <https://lists.libcamera.org/pipermail/libcamera-devel/attachments/20190812/d2bddb50/attachment.sig>