Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754674Ab2BOTBo (ORCPT ); Wed, 15 Feb 2012 14:01:44 -0500 Received: from charlotte.tuxdriver.com ([70.61.120.58]:49172 "EHLO smtp.tuxdriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754563Ab2BOTBm (ORCPT ); Wed, 15 Feb 2012 14:01:42 -0500 Date: Wed, 15 Feb 2012 13:55:26 -0500 From: "John W. Linville" To: Larry Finger Cc: Tim Gardner , Chaoming Li , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3] rtlwifi: rtl8192se firmware load can overflow target buffer Message-ID: <20120215185525.GE4379@tuxdriver.com> References: <1328833192-10681-1-git-send-email-Larry.Finger@lwfinger.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1328833192-10681-1-git-send-email-Larry.Finger@lwfinger.net> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3236 Lines: 83 Is this a fix that should go to 3.3? On Thu, Feb 09, 2012 at 06:19:52PM -0600, Larry Finger wrote: > From: Tim Gardner > > Define RTL8190_MAX_RAW_FIRMWARE_CODE_SIZE which represents the > maximimum possible firmware file size. Use it in the definition > of the buffer which receives the firmware file data. > > Set RTL8190_MAX_RAW_FIRMWARE_CODE_SIZE closer to the actual size of > the firmware file, e.g., 90000 (down from hard coded 164000). The current > size of rtlwifi/rtl8192sefw.bin is 88856. > > Set max_fw_size to RTL8190_MAX_RAW_FIRMWARE_CODE_SIZE for the size limit > check. Fix the error case where max_fw_size is not cleared if the size > limit check fails. > > Cc: Chaoming Li > Cc: linux-wireless@vger.kernel.org > Cc: netdev@vger.kernel.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Tim Gardner > Signed-off-by: Larry Finger > --- > drivers/net/wireless/rtlwifi/rtl8192se/fw.h | 3 ++- > drivers/net/wireless/rtlwifi/rtl8192se/sw.c | 3 ++- > 2 files changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/wireless/rtlwifi/rtl8192se/fw.h b/drivers/net/wireless/rtlwifi/rtl8192se/fw.h > index babe85d..b4afff6 100644 > --- a/drivers/net/wireless/rtlwifi/rtl8192se/fw.h > +++ b/drivers/net/wireless/rtlwifi/rtl8192se/fw.h > @@ -30,6 +30,7 @@ > #define __REALTEK_FIRMWARE92S_H__ > > #define RTL8190_MAX_FIRMWARE_CODE_SIZE 64000 > +#define RTL8190_MAX_RAW_FIRMWARE_CODE_SIZE 90000 > #define RTL8190_CPU_START_OFFSET 0x80 > /* Firmware Local buffer size. 64k */ > #define MAX_FIRMWARE_CODE_SIZE 0xFF00 > @@ -217,7 +218,7 @@ struct rt_firmware { > u8 fw_emem[RTL8190_MAX_FIRMWARE_CODE_SIZE]; > u32 fw_imem_len; > u32 fw_emem_len; > - u8 sz_fw_tmpbuffer[164000]; > + u8 sz_fw_tmpbuffer[RTL8190_MAX_RAW_FIRMWARE_CODE_SIZE]; > u32 sz_fw_tmpbufferlen; > u16 cmdpacket_fragthresold; > }; > diff --git a/drivers/net/wireless/rtlwifi/rtl8192se/sw.c b/drivers/net/wireless/rtlwifi/rtl8192se/sw.c > index ca38dd9..345d752 100644 > --- a/drivers/net/wireless/rtlwifi/rtl8192se/sw.c > +++ b/drivers/net/wireless/rtlwifi/rtl8192se/sw.c > @@ -108,6 +108,7 @@ static void rtl92se_fw_cb(const struct firmware *firmware, void *context) > if (firmware->size > rtlpriv->max_fw_size) { > RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG, > "Firmware is too big!\n"); > + rtlpriv->max_fw_size = 0; > release_firmware(firmware); > return; > } > @@ -232,7 +233,7 @@ static int rtl92s_init_sw_vars(struct ieee80211_hw *hw) > return 1; > } > > - rtlpriv->max_fw_size = sizeof(struct rt_firmware); > + rtlpriv->max_fw_size = RTL8190_MAX_RAW_FIRMWARE_CODE_SIZE; > > pr_info("Driver for Realtek RTL8192SE/RTL8191SE\n" > "Loading firmware %s\n", rtlpriv->cfg->fw_name); > -- > 1.7.9 > > -- John W. Linville Someday the world will need a hero, and you linville@tuxdriver.com might be all we have. Be ready. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/