From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx2.redhat.com ([66.187.237.31]:33754 "EHLO mx2.redhat.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1750737AbZHSRJP (ORCPT ); Wed, 19 Aug 2009 13:09:15 -0400 Subject: Re: [PATCH] libertas: don't use dynamic-sized array From: Dan Williams To: Andrey Yurovsky Cc: linux-wireless@vger.kernel.org In-Reply-To: <1250210080-21960-1-git-send-email-andrey@cozybit.com> References: <43e72e890908131331q371320a3gf1ab53ea27574549@mail.gmail.com> <1250210080-21960-1-git-send-email-andrey@cozybit.com> Content-Type: text/plain Date: Wed, 19 Aug 2009 12:09:20 -0500 Message-Id: <1250701760.5351.42.camel@localhost.localdomain> Mime-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org List-ID: On Thu, 2009-08-13 at 17:34 -0700, Andrey Yurovsky wrote: > sparse complains about a bad constant expression due to the use of a > dynamic-sized array in get_common_rates(). Allocate and free the array > instead. Mind testing this patch from libertas-dev? It should fix this but also clears up some of the confustion: Subject: Re: Libertas: Association request to the driver failed Date: Wed, 12 Aug 2009 12:34:17 -0500 Signed-off-by: Dan Williams diff --git a/drivers/net/wireless/libertas/assoc.c b/drivers/net/wireless/libertas/assoc.c index 1902b6f..8c05388 100644 --- a/drivers/net/wireless/libertas/assoc.c +++ b/drivers/net/wireless/libertas/assoc.c @@ -35,7 +35,8 @@ static const u8 bssid_off[ETH_ALEN] __attribute__ ((aligned (2))) = * * @param priv A pointer to struct lbs_private structure * @param rates the buffer which keeps input and output - * @param rates_size the size of rate1 buffer; new size of buffer on return + * @param rates_size the size of rates buffer; new size of buffer on return, + * which will be less than or equal to original rates_size * * @return 0 on success, or -1 on error */ @@ -43,39 +44,42 @@ static int get_common_rates(struct lbs_private *priv, u8 *rates, u16 *rates_size) { - u8 *card_rates = lbs_bg_rates; - int ret = 0, i, j; - u8 tmp[(ARRAY_SIZE(lbs_bg_rates) - 1) * (*rates_size - 1)]; - size_t tmp_size = 0; - - /* For each rate in card_rates that exists in rate1, copy to tmp */ - for (i = 0; i < ARRAY_SIZE(lbs_bg_rates) && card_rates[i]; i++) { - for (j = 0; j < *rates_size && rates[j]; j++) { - if (rates[j] == card_rates[i]) - tmp[tmp_size++] = card_rates[i]; + int i, j; + u8 intersection[MAX_RATES]; + u16 intersection_size; + u16 num_rates = 0; + + intersection_size = min_t(u16, *rates_size, ARRAY_SIZE(intersection)); + + /* Allow each rate from 'rates' that is supported by the hardware */ + for (i = 0; i < ARRAY_SIZE(lbs_bg_rates) && lbs_bg_rates[i]; i++) { + for (j = 0; j < intersection_size && rates[j]; j++) { + if (rates[j] == lbs_bg_rates[i]) + intersection[num_rates++] = rates[j]; } } lbs_deb_hex(LBS_DEB_JOIN, "AP rates ", rates, *rates_size); - lbs_deb_hex(LBS_DEB_JOIN, "card rates ", card_rates, + lbs_deb_hex(LBS_DEB_JOIN, "card rates ", lbs_bg_rates, ARRAY_SIZE(lbs_bg_rates)); - lbs_deb_hex(LBS_DEB_JOIN, "common rates", tmp, tmp_size); + lbs_deb_hex(LBS_DEB_JOIN, "common rates", intersection, num_rates); lbs_deb_join("TX data rate 0x%02x\n", priv->cur_rate); if (!priv->enablehwauto) { - for (i = 0; i < tmp_size; i++) { - if (tmp[i] == priv->cur_rate) + for (i = 0; i < num_rates; i++) { + if (intersection[i] == priv->cur_rate) goto done; } lbs_pr_alert("Previously set fixed data rate %#x isn't " "compatible with the network.\n", priv->cur_rate); - ret = -1; + return -1; } + done: memset(rates, 0, *rates_size); - *rates_size = min_t(int, tmp_size, *rates_size); - memcpy(rates, tmp, *rates_size); - return ret; + *rates_size = num_rates; + memcpy(rates, intersection, num_rates); + return 0; } @@ -317,8 +321,8 @@ static int lbs_associate(struct lbs_private *priv, rates = (struct mrvl_ie_rates_param_set *) pos; rates->header.type = cpu_to_le16(TLV_TYPE_RATES); - memcpy(&rates->rates, &bss->rates, MAX_RATES); - tmplen = min_t(u16, ARRAY_SIZE(rates->rates), MAX_RATES); + tmplen = min_t(u16, ARRAY_SIZE(bss->rates), MAX_RATES); + memcpy(&rates->rates, &bss->rates, tmplen); if (get_common_rates(priv, rates->rates, &tmplen)) { ret = -1; goto done; @@ -592,7 +596,7 @@ static int lbs_adhoc_join(struct lbs_private *priv, /* Copy Data rates from the rates recorded in scan response */ memset(cmd.bss.rates, 0, sizeof(cmd.bss.rates)); - ratesize = min_t(u16, ARRAY_SIZE(cmd.bss.rates), MAX_RATES); + ratesize = min_t(u16, ARRAY_SIZE(cmd.bss.rates), ARRAY_SIZE (bss->rates)); memcpy(cmd.bss.rates, bss->rates, ratesize); if (get_common_rates(priv, cmd.bss.rates, &ratesize)) { lbs_deb_join("ADHOC_JOIN: get_common_rates returned error.\n");