Re: [PATCH] ipw2x00: Write outside array bounds

On Sun, 2009-07-26 at 05:48 +0800, Roel Kluin wrote:
> channel_index loops up to IPW_SCAN_CHANNELS, but is used after being
> incremented. This might be able to access 1 past the end of the array
> 
> Signed-off-by: Roel Kluin <[email protected]>

Thanks. Do you think below patch is better?

Thanks,
-yi

diff --git a/drivers/net/wireless/ipw2x00/ipw2200.c b/drivers/net/wireless/ipw2x00/ipw2200.c
index 2dc1cdb..07f171c 100644
--- a/drivers/net/wireless/ipw2x00/ipw2200.c
+++ b/drivers/net/wireless/ipw2x00/ipw2200.c
@@ -6226,7 +6226,7 @@ static void ipw_add_scan_channels(struct ipw_priv *priv,
 			};
 
 			u8 channel;
-			while (channel_index < IPW_SCAN_CHANNELS) {
+			while (channel_index < IPW_SCAN_CHANNELS - 1) {
 				channel =
 				    priv->speed_scan[priv->speed_scan_pos];
 				if (channel == 0) {


> ---
> diff --git a/drivers/net/wireless/ipw2x00/ipw2200.c b/drivers/net/wireless/ipw2x00/ipw2200.c
> index 44c29b3..d1c9d6d 100644
> --- a/drivers/net/wireless/ipw2x00/ipw2200.c
> +++ b/drivers/net/wireless/ipw2x00/ipw2200.c
> @@ -6249,7 +6249,10 @@ static void ipw_add_scan_channels(struct ipw_priv *priv,
>  
>  				channels[channel - 1] = 1;
>  				priv->speed_scan_pos++;
> -				channel_index++;
> +
> +				if (++channel_index >= IPW_SCAN_CHANNELS)
> +					break;
> +
>  				scan->channels_list[channel_index] = channel;
>  				index =
>  				    ieee80211_channel_to_index(priv->ieee, channel);

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