On Sun, Sep 06, 2020 at 01:05:48PM -0700, trix@xxxxxxxxxx wrote:
> From: Tom Rix <trix@xxxxxxxxxx>
>
> clang static analyzer reports this problem
>
> init.c:739:8: warning: Called function pointer
> is null (null dereference)
> ret = adapter->if_ops.check_fw_status( ...
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> In mwifiex_dnld_fw, there is an earlier check for check_fw_status(),
> The check was introduced for usb support at the same time this
> check in _mwifiex_fw_dpc() was made
>
> if (adapter->if_ops.dnld_fw) {
> ret = adapter->if_ops.dnld_fw(adapter, &fw);
> } else {
> ret = mwifiex_dnld_fw(adapter, &fw);
> }
>
> And a dnld_fw function initialized as part the usb's
> mwifiex_if_ops.
>
> The other instances of mwifiex_if_ops for pci and sdio
> both set check_fw_status.
>
> So the first check is not needed and can be removed.
>
> Fixes: 4daffe354366 ("mwifiex: add support for Marvell USB8797 chipset")
> Signed-off-by: Tom Rix <trix@xxxxxxxxxx>
Indeed, on the surface, mwifiex_dnld_fw assumes that check_fw_status()
cannot be NULL because it will always be called at the end of the
function even if the first check is skipped.
Reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
> ---
> drivers/net/wireless/marvell/mwifiex/init.c | 14 ++++++--------
> 1 file changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/net/wireless/marvell/mwifiex/init.c b/drivers/net/wireless/marvell/mwifiex/init.c
> index 82d69bc3aaaf..f006a3d72b40 100644
> --- a/drivers/net/wireless/marvell/mwifiex/init.c
> +++ b/drivers/net/wireless/marvell/mwifiex/init.c
> @@ -695,14 +695,12 @@ int mwifiex_dnld_fw(struct mwifiex_adapter *adapter,
> int ret;
> u32 poll_num = 1;
>
> - if (adapter->if_ops.check_fw_status) {
> - /* check if firmware is already running */
> - ret = adapter->if_ops.check_fw_status(adapter, poll_num);
> - if (!ret) {
> - mwifiex_dbg(adapter, MSG,
> - "WLAN FW already running! Skip FW dnld\n");
> - return 0;
> - }
> + /* check if firmware is already running */
> + ret = adapter->if_ops.check_fw_status(adapter, poll_num);
> + if (!ret) {
> + mwifiex_dbg(adapter, MSG,
> + "WLAN FW already running! Skip FW dnld\n");
> + return 0;
> }
>
> /* check if we are the winner for downloading FW */
> --
> 2.18.1
>
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