> -----Original Message-----
> From:
linux-wireless-owner@vger.kernel.org
> [mailto:linux-wireless-owner@vger.kernel.org] On Behalf Of Adrian Bunk
> Sent: Sunday, October 14, 2007 1:51 PM
> To: Zhu, Yi
> Cc: linux-wireless@vger.kernel.org;
> ipw3945-devel@lists.sourceforge.net;
linux-kernel@vger.kernel.org
> Subject: [2.6 patch] iwl4965-base.c: fix off-by-one errors
>
> This patch fixes two off-by-one errors resulting in array
> overflows spotted by the Coverity checker.
>
> Signed-off-by: Adrian Bunk <bunk@kernel.org>
>
> ---
>
> drivers/net/wireless/iwlwifi/iwl4965-base.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> --- linux-2.6/drivers/net/wireless/iwlwifi/iwl4965-base.c.old
> 2007-10-14 16:52:21.000000000 +0200
> +++ linux-2.6/drivers/net/wireless/iwlwifi/iwl4965-base.c
> 2007-10-14 16:59:37.000000000 +0200
> @@ -4489,23 +4489,23 @@ static u8 ratio2dB[100] = {
> 39, 39, 39, 39, 39, 40, 40, 40, 40, 40 /* 90 - 99 */ };
>
> /* Calculates a relative dB value from a ratio of linear
> * (i.e. not dB) signal levels.
> * Conversion assumes that levels are voltages (20*log), not
> powers (10*log). */ int iwl_calc_db_from_ratio(int sig_ratio) {
> - /* Anything above 1000:1 just report as 60 dB */
> - if (sig_ratio > 1000)
> + /* 1000:1 or higher just report as 60 dB */
> + if (sig_ratio >= 1000)
> return 60;
>
> - /* Above 100:1, divide by 10 and use table,
> + /* 100:1 or higher, divide by 10 and use table,
> * add 20 dB to make up for divide by 10 */
> - if (sig_ratio > 100)
> + if (sig_ratio >= 100)
> return (20 + (int)ratio2dB[sig_ratio/10]);
>
> /* We shouldn't see this */
> if (sig_ratio < 1)
> return 0;
>
> /* Use table for ratios 1:1 - 99:1 */
> return (int)ratio2dB[sig_ratio];
>
> -
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