On Thu, Dec 23, 2021 at 8:29 AM <trix@xxxxxxxxxx> wrote:
>
> From: Tom Rix <trix@xxxxxxxxxx>
>
> Clang static analysis reports this warnings
>
> mlme.c:5332:7: warning: Branch condition evaluates to a
> garbage value
> have_higher_than_11mbit)
> ^~~~~~~~~~~~~~~~~~~~~~~
>
> have_higher_than_11mbit is only set to true some of the time in
> ieee80211_get_rates() but is checked all of the time. So
> have_higher_than_11mbit needs to be initialized to false.
LGTM. There's only one caller of ieee80211_get_rates() today; if there
were others, they could make a similar mistake in the future. An
alternate approach: ieee80211_get_rates() could unconditionally write
false before the loop that could later write true. Then call sites
don't need to worry about this conditional assignment. Perhaps that
would be preferable? If not:
Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
>
> Fixes: 5d6a1b069b7f ("mac80211: set basic rates earlier")
> Signed-off-by: Tom Rix <trix@xxxxxxxxxx>
> ---
> net/mac80211/mlme.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
> index 51f55c4ee3c6e..766cbbc9c3a72 100644
> --- a/net/mac80211/mlme.c
> +++ b/net/mac80211/mlme.c
> @@ -5279,7 +5279,7 @@ static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
> */
> if (new_sta) {
> u32 rates = 0, basic_rates = 0;
> - bool have_higher_than_11mbit;
> + bool have_higher_than_11mbit = false;
> int min_rate = INT_MAX, min_rate_index = -1;
> const struct cfg80211_bss_ies *ies;
> int shift = ieee80211_vif_get_shift(&sdata->vif);
> --
> 2.26.3
>
--
Thanks,
~Nick Desaulniers
