From: Nick Desaulniers <ndesaulniers@google.com>
To: trix@redhat.com
Cc: johannes@sipsolutions.net, davem@davemloft.net, kuba@kernel.org,
nathan@kernel.org, linville@tuxdriver.com,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, llvm@lists.linux.dev
Subject: Re: [PATCH] mac80211: initialize variable have_higher_than_11mbit
Date: Thu, 23 Dec 2021 12:30:01 -0800 [thread overview]
Message-ID: <CAKwvOd=dLjMAim_FRNyWegzEjy0_1vF2xVW1hNPQ55=32qO4Wg@mail.gmail.com> (raw)
In-Reply-To: <20211223162848.3243702-1-trix@redhat.com>
On Thu, Dec 23, 2021 at 8:29 AM <trix@redhat.com> wrote:
>
> From: Tom Rix <trix@redhat.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.
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@google.com>
>
> Fixes: 5d6a1b069b7f ("mac80211: set basic rates earlier")
> Signed-off-by: Tom Rix <trix@redhat.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
>
--
Thanks,
~Nick Desaulniers
next prev parent reply other threads:[~2021-12-23 20:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-23 16:28 [PATCH] mac80211: initialize variable have_higher_than_11mbit trix
2021-12-23 20:30 ` Nick Desaulniers [this message]
2021-12-24 14:01 ` Tom Rix
2021-12-28 18:55 ` Nick Desaulniers
2021-12-29 19:26 ` Tom Rix
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