On 12/23/21 12:30 PM, Nick Desaulniers wrote:
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:
The have_higher_than_11mbit variable had previously be initialized to false. The commit 5d6a1b069b7f moved the variable without initializing. Tom
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
