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SubjectRe: [PATCH v3] rtlwifi: rtl8192se firmware load can overflow target buffer
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 <tim.gardner@canonical.com>
>
> 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 <chaoming_li@realsil.com.cn>
> Cc: linux-wireless@vger.kernel.org
> Cc: netdev@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
> Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
> ---
> 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.


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