[U-Boot] [Patch V2 2/3] gadget: f_thor: check pointers before use in download_tail()

[Lukasz Majewski <l.majewski@samsung.com>]

Hi Przemyslaw,

> Some pointers in function download_tail() were not checked
> before the use. This could possibly cause the data abort.
> To avoid this, check if the pointers are not null is added.
> 
> Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
> ---
> Change v2:
> - download_tail(): change printf() to error()
> ---
>  drivers/usb/gadget/f_thor.c | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/gadget/f_thor.c b/drivers/usb/gadget/f_thor.c
> index 78519fa..2d0410d 100644
> --- a/drivers/usb/gadget/f_thor.c
> +++ b/drivers/usb/gadget/f_thor.c
> @@ -205,12 +205,24 @@ static long long int download_head(unsigned
> long long total, 
>  static int download_tail(long long int left, int cnt)
>  {
> -	struct dfu_entity *dfu_entity =
> dfu_get_entity(alt_setting_num);
> -	void *transfer_buffer = dfu_get_buf(dfu_entity);
> +	struct dfu_entity *dfu_entity;
> +	void *transfer_buffer;
>  	int ret;
>  
>  	debug("%s: left: %llu cnt: %d\n", __func__, left, cnt);
>  
> +	dfu_entity = dfu_get_entity(alt_setting_num);
> +	if (!dfu_entity) {
> +		error("Alt setting: %d entity not found!\n",
> alt_setting_num);
> +		return -ENOENT;
> +	}
> +
> +	transfer_buffer = dfu_get_buf(dfu_entity);
> +	if (!transfer_buffer) {
> +		error("Transfer buffer not allocated!");
> +		return -ENXIO;
> +	}
> +
>  	if (left) {
>  		ret = dfu_write(dfu_entity, transfer_buffer, left,
> cnt++); if (ret) {

Applied to u-boot-dfu, thanks!

-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group