On Thu, Apr 01, 2021 at 10:15:02AM +0100, Srinivas Kandagatla wrote:
> Looks like return from reg_write is set but not checked.
> Fix this by adding error return path.
>
> Reported-by: coverity-bot <keescook+coverity-bot@xxxxxxxxxxxx>
> Addresses-Coverity-ID: 1503591 ("UNUSED_VALUE")
> Fixes: 128eaf937adb ("soundwire: qcom: add support to missing transport params")
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Thanks for fixing this!
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
-Kees
> ---
> drivers/soundwire/qcom.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
> index 5fd4a99cc8ac..348d9a46f850 100644
> --- a/drivers/soundwire/qcom.c
> +++ b/drivers/soundwire/qcom.c
> @@ -731,17 +731,23 @@ static int qcom_swrm_transport_params(struct sdw_bus *bus,
> value |= pcfg->si;
>
> ret = ctrl->reg_write(ctrl, reg, value);
> + if (ret)
> + goto err;
>
> if (pcfg->lane_control != SWR_INVALID_PARAM) {
> reg = SWRM_DP_PORT_CTRL_2_BANK(params->port_num, bank);
> value = pcfg->lane_control;
> ret = ctrl->reg_write(ctrl, reg, value);
> + if (ret)
> + goto err;
> }
>
> if (pcfg->blk_group_count != SWR_INVALID_PARAM) {
> reg = SWRM_DP_BLOCK_CTRL2_BANK(params->port_num, bank);
> value = pcfg->blk_group_count;
> ret = ctrl->reg_write(ctrl, reg, value);
> + if (ret)
> + goto err;
> }
>
> if (pcfg->hstart != SWR_INVALID_PARAM
> @@ -755,11 +761,15 @@ static int qcom_swrm_transport_params(struct sdw_bus *bus,
> ret = ctrl->reg_write(ctrl, reg, value);
> }
>
> + if (ret)
> + goto err;
> +
> if (pcfg->bp_mode != SWR_INVALID_PARAM) {
> reg = SWRM_DP_BLOCK_CTRL3_BANK(params->port_num, bank);
> ret = ctrl->reg_write(ctrl, reg, pcfg->bp_mode);
> }
>
> +err:
> return ret;
> }
>
> --
> 2.21.0
>
--
Kees Cook
