Re: [PATCH v3] rtlwifi: rtl8192se firmware load can overflow target buffer

From: Tim Gardner <redacted>

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 <redacted>
Cc: linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Signed-off-by: Tim Gardner <redacted>
Signed-off-by: Larry Finger <redacted>
---
 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