Return-path: Received: from charlotte.tuxdriver.com ([70.61.120.58]:43514 "EHLO smtp.tuxdriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753075AbZHKSbM (ORCPT ); Tue, 11 Aug 2009 14:31:12 -0400 Date: Tue, 11 Aug 2009 14:24:26 -0400 From: "John W. Linville" To: Roel Kluin Cc: Daniel Mack , libertas-dev@lists.infradead.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, dcbw@redhat.com Subject: Re: Libertas: Association request to the driver failed Message-ID: <20090811182426.GE2634@tuxdriver.com> References: <20090807191156.GS19257@buzzloop.caiaq.de> <20090807193610.GK7545@tuxdriver.com> <20090808123512.GZ19257@buzzloop.caiaq.de> <4A7D8AB6.9030707@gmail.com> <4A7E9596.4070901@gmail.com> <20090809102417.GH13639@buzzloop.caiaq.de> <4A7EAED8.9090900@gmail.com> <20090810175939.GH2733@tuxdriver.com> <4A811776.8090003@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <4A811776.8090003@gmail.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: Comments from the libertas crowd? This seems a bit long for this part of the cycle. Should we just revert the original patch, then reapply it with this one for 2.6.32? John On Tue, Aug 11, 2009 at 09:02:14AM +0200, Roel Kluin wrote: > The size of the tmp buffer was too small, causing a regression > > rates->rates has an arraysize of 1, so a memcpy with > MAX_RATES (14) was already causing reads out of bounds. > > In get_common_rates() the memset/memcpy can be moved upwards. > > Signed-off-by: Roel Kluin > Tested-by: Daniel Mack > --- > > Delta patch, please... > > Here, > > diff --git a/drivers/net/wireless/libertas/assoc.c b/drivers/net/wireless/libertas/assoc.c > index d699737..ba0164a 100644 > --- a/drivers/net/wireless/libertas/assoc.c > +++ b/drivers/net/wireless/libertas/assoc.c > @@ -44,8 +44,8 @@ static int get_common_rates(struct lbs_private *priv, > 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)]; > + int i, j; > + u8 tmp[MAX_RATES * ARRAY_SIZE(lbs_bg_rates)]; > size_t tmp_size = 0; > > /* For each rate in card_rates that exists in rate1, copy to tmp */ > @@ -62,20 +62,23 @@ static int get_common_rates(struct lbs_private *priv, > lbs_deb_hex(LBS_DEB_JOIN, "common rates", tmp, tmp_size); > lbs_deb_join("TX data rate 0x%02x\n", priv->cur_rate); > > + memset(rates, 0, *rates_size); > + *rates_size = min_t(u16, tmp_size, *rates_size); > + memcpy(rates, tmp, *rates_size); > + > if (!priv->enablehwauto) { > for (i = 0; i < tmp_size; i++) { > if (tmp[i] == priv->cur_rate) > - goto done; > + break; > + } > + if (i == tmp_size) { > + lbs_pr_alert("Previously set fixed data rate %#x isn't " > + "compatible with the network.\n", > + priv->cur_rate); > + return -1; > } > - lbs_pr_alert("Previously set fixed data rate %#x isn't " > - "compatible with the network.\n", priv->cur_rate); > - ret = -1; > } > -done: > - memset(rates, 0, *rates_size); > - *rates_size = min_t(int, tmp_size, *rates_size); > - memcpy(rates, tmp, *rates_size); > - return ret; > + return 0; > } > > > @@ -319,8 +322,8 @@ 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); > + memcpy(&rates->rates, &bss->rates, tmplen); > if (get_common_rates(priv, rates->rates, &tmplen)) { > ret = -1; > goto done; > -- John W. Linville Someday the world will need a hero, and you linville@tuxdriver.com might be all we have. Be ready.