linux-kernel - Re: [PATCH v2] wireless/nl80211.c: fix uninitialized variable

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Date:   Tue, 30 Mar 2021 19:14:57 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Alaa Emad <alaaemadhossney.ae@...il.com>
Cc:     johannes@...solutions.net, davem@...emloft.net, kuba@...nel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller@...glegroups.com,
        syzbot+72b99dcf4607e8c770f3@...kaller.appspotmail.com
Subject: Re: [PATCH v2] wireless/nl80211.c: fix uninitialized variable

On Tue, Mar 30, 2021 at 06:37:05PM +0200, Alaa Emad wrote:
> This change fix  KMSAN uninit-value in net/wireless/nl80211.c:225 , That
> because of `fixedlen` variable uninitialized,So I initialized it by zero.
> 
> Reported-by: syzbot+72b99dcf4607e8c770f3@...kaller.appspotmail.com
> Signed-off-by: Alaa Emad <alaaemadhossney.ae@...il.com>
> ---
> Changes in v2:
>   - Make the commit message more clearer.
> ---
>  net/wireless/nl80211.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
> index 775d0c4d86c3..b87ab67ad33d 100644
> --- a/net/wireless/nl80211.c
> +++ b/net/wireless/nl80211.c
> @@ -210,7 +210,7 @@ static int validate_beacon_head(const struct nlattr *attr,
>  	const struct element *elem;
>  	const struct ieee80211_mgmt *mgmt = (void *)data;
>  	bool s1g_bcn = ieee80211_is_s1g_beacon(mgmt->frame_control);
> -	unsigned int fixedlen, hdrlen;
> +	unsigned int fixedlen = 0 , hdrlen;

Please always use scripts/checkpatch.pl before sending out patches.  It
would have pointed out that this line is incorrect and needs to be fixed
up  :(

thanks,

greg k-h