netdev - RE: [PATCH 21/38] mwifiex: fix comparison expression

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Date:	Tue, 22 Sep 2015 10:56:54 +0000
From:	Amitkumar Karwar <akarwar@...vell.com>
To:	Andrzej Hajda <a.hajda@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Nishant Sarmukadam <nishants@...vell.com>,
	"Kalle Valo" <kvalo@...eaurora.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH 21/38] mwifiex: fix comparison expression

Hi Andrzej,

> From: Andrzej Hajda [mailto:a.hajda@...sung.com]
> Sent: Monday, September 21, 2015 7:04 PM
> To: linux-kernel@...r.kernel.org
> Cc: Andrzej Hajda; Bartlomiej Zolnierkiewicz; Marek Szyprowski;
> Amitkumar Karwar; Nishant Sarmukadam; Kalle Valo; linux-
> wireless@...r.kernel.org; netdev@...r.kernel.org
> Subject: [PATCH 21/38] mwifiex: fix comparison expression
> 
> To avoid underflows signed variables should be used in expression.
> 
> The problem has been detected using proposed semantic patch
> scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1].
> 
> [1]: http://permalink.gmane.org/gmane.linux.kernel/2038576
> 
> Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
> ---
>  drivers/net/wireless/mwifiex/11n_rxreorder.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/mwifiex/11n_rxreorder.c
> b/drivers/net/wireless/mwifiex/11n_rxreorder.c
> index 2906cd5..b3970a8 100644
> --- a/drivers/net/wireless/mwifiex/11n_rxreorder.c
> +++ b/drivers/net/wireless/mwifiex/11n_rxreorder.c
> @@ -615,10 +615,10 @@ int mwifiex_11n_rx_reorder_pkt(struct
> mwifiex_private *priv,
>  	    ((end_win > start_win) && ((seq_num > end_win) ||
>  				       (seq_num < start_win)))) {
>  		end_win = seq_num;
> -		if (((seq_num - win_size) + 1) >= 0)
> +		if (((end_win - win_size) + 1) >= 0)
>  			start_win = (end_win - win_size) + 1;
>  		else
> -			start_win = (MAX_TID_VALUE - (win_size - seq_num)) +
> 1;
> +			start_win = (MAX_TID_VALUE - (win_size - end_win)) +
> 1;
>  		mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl,
> start_win);
>  	}
> 

Acked-by: Amitkumar Karwar <akarwar@...vell.com>

Regards,
Amitkumar
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