Re: [PATCH v6 01/13] firmware: qcom: qseecom: fix memory leaks in error paths

[Maximilian Luz <luzmaximilian@xxxxxxxxx>]

On 11/27/23 15:15, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
>
> Fix instances of returning error codes directly instead of jumping to
> the relevant labels where memory allocated for the SCM calls would be
> freed.
>
> Fixes: 759e7a2b62eb ("firmware: Add support for Qualcomm UEFI Secure Application")
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Reported-by: Dan Carpenter <error27@xxxxxxxxx>
> Closes: https://lore.kernel.org/r/202311270828.k4HGcjiL-lkp@xxxxxxxxx/
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>

Thanks!

Reviewed-by: Maximilian Luz <luzmaximilian@xxxxxxxxx>

> ---
>   .../firmware/qcom/qcom_qseecom_uefisecapp.c   | 20 ++++++++++++-------
>   1 file changed, 13 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/firmware/qcom/qcom_qseecom_uefisecapp.c b/drivers/firmware/qcom/qcom_qseecom_uefisecapp.c
> index a33acdaf7b78..32188f098ef3 100644
> --- a/drivers/firmware/qcom/qcom_qseecom_uefisecapp.c
> +++ b/drivers/firmware/qcom/qcom_qseecom_uefisecapp.c
> @@ -325,8 +325,10 @@ static efi_status_t qsee_uefi_get_variable(struct qcuefi_client *qcuefi, const e
>   	req_data->length = req_size;
>   
>   	status = ucs2_strscpy(((void *)req_data) + req_data->name_offset, name, name_length);
> -	if (status < 0)
> -		return EFI_INVALID_PARAMETER;
> +	if (status < 0) {
> +		efi_status = EFI_INVALID_PARAMETER;
> +		goto out_free;
> +	}
>   
>   	memcpy(((void *)req_data) + req_data->guid_offset, guid, req_data->guid_size);
>   
> @@ -471,8 +473,10 @@ static efi_status_t qsee_uefi_set_variable(struct qcuefi_client *qcuefi, const e
>   	req_data->length = req_size;
>   
>   	status = ucs2_strscpy(((void *)req_data) + req_data->name_offset, name, name_length);
> -	if (status < 0)
> -		return EFI_INVALID_PARAMETER;
> +	if (status < 0) {
> +		efi_status = EFI_INVALID_PARAMETER;
> +		goto out_free;
> +	}
>   
>   	memcpy(((void *)req_data) + req_data->guid_offset, guid, req_data->guid_size);
>   
> @@ -563,8 +567,10 @@ static efi_status_t qsee_uefi_get_next_variable(struct qcuefi_client *qcuefi,
>   	memcpy(((void *)req_data) + req_data->guid_offset, guid, req_data->guid_size);
>   	status = ucs2_strscpy(((void *)req_data) + req_data->name_offset, name,
>   			      *name_size / sizeof(*name));
> -	if (status < 0)
> -		return EFI_INVALID_PARAMETER;
> +	if (status < 0) {
> +		efi_status = EFI_INVALID_PARAMETER;
> +		goto out_free;
> +	}
>   
>   	status = qcom_qseecom_app_send(qcuefi->client, req_data, req_size, rsp_data, rsp_size);
>   	if (status) {
> @@ -635,7 +641,7 @@ static efi_status_t qsee_uefi_get_next_variable(struct qcuefi_client *qcuefi,
>   		 * have already been validated above, causing this function to
>   		 * bail with EFI_BUFFER_TOO_SMALL.
>   		 */
> -		return EFI_DEVICE_ERROR;
> +		efi_status = EFI_DEVICE_ERROR;
>   	}
>   
>   out_free: