linux-kernel - [PATCH] mac80211: initialize variable have_higher_than

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Date:   Thu, 23 Dec 2021 08:28:48 -0800
From:   trix@...hat.com
To:     johannes@...solutions.net, davem@...emloft.net, kuba@...nel.org,
        nathan@...nel.org, ndesaulniers@...gle.com, linville@...driver.com
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Tom Rix <trix@...hat.com>
Subject: [PATCH] mac80211: initialize variable have_higher_than_11mbit

From: Tom Rix <trix@...hat.com>

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.

Fixes: 5d6a1b069b7f ("mac80211: set basic rates earlier")
Signed-off-by: Tom Rix <trix@...hat.com>
---
 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