linux-kernel - Re: [PATCH] wcn36xx: Initialize channel to NULL inside wcn36xx_change

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Message-ID: <CAMZdPi_t3__yRNJLZ1k-KO5ZOunfmcsX4_zSp5-9QbrFcgYY0Q@mail.gmail.com>
Date:   Mon, 21 Feb 2022 09:15:16 +0100
From:   Loic Poulain <loic.poulain@...aro.org>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     kvalo@...nel.org, davem@...emloft.net, kuba@...nel.org,
        nathan@...nel.org, ndesaulniers@...gle.com,
        ryan.odonoghue@...aro.org, wcn36xx@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] wcn36xx: Initialize channel to NULL inside wcn36xx_change_opchannel()

On Sat, 19 Feb 2022 at 16:29, Souptick Joarder <jrdr.linux@...il.com> wrote:
>
> From: "Souptick Joarder (HPE)" <jrdr.linux@...il.com>
>
> Kernel test robot reported below warning ->
> drivers/net/wireless/ath/wcn36xx/main.c:409:7: warning: Branch
> condition evaluates to a garbage value
> [clang-analyzer-core.uninitialized.Branch]
>
> Also code walk indicates, if channel is not found in first band,
> it will break the loop and instead of exit it will go ahead and
> assign a garbage value in wcn->channel which looks like a bug.
>
> Initialize channel with NULL should avoid this issue.
>
> Fixes:  d6f2746691cb ("wcn36xx: Track the band and channel we are tuned to")
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Souptick Joarder (HPE) <jrdr.linux@...il.com>

Reviewed-by: Loic Poulain <loic.poulain@...aro.org>



> ---
>  drivers/net/wireless/ath/wcn36xx/main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
> index 75661d449712..1a06eff07107 100644
> --- a/drivers/net/wireless/ath/wcn36xx/main.c
> +++ b/drivers/net/wireless/ath/wcn36xx/main.c
> @@ -394,7 +394,7 @@ static void wcn36xx_change_opchannel(struct wcn36xx *wcn, int ch)
>         struct ieee80211_vif *vif = NULL;
>         struct wcn36xx_vif *tmp;
>         struct ieee80211_supported_band *band;
> -       struct ieee80211_channel *channel;
> +       struct ieee80211_channel *channel = NULL;
>         unsigned long flags;
>         int i, j;
>
> --
> 2.25.1
>