Staging: rtl8192su: buffer overflow in r8192U_core.c

There was a buffer overflow in the original code.  rf_path was 2 and it should
have been only 0 or 1.

I don't have the hardware for this, so I can't test it.

Looking at the code, there are two almost identical sections for updating the
hal variables.  The first one was clearly wrong and had the array overflow as 
well.  The second one looked correct.  I decided to use the second section as
is except for whitespace changes.

The differences between the two original sections:
1)  The second one had more debug output.
2)  The second one looped over rf_path instead of corrupting data.
3)  The second one had these additional assigments.
                      if (rf_path == 0) {
                              priv->TxPowerLevelOFDM24G[i] = priv->RfTxPwrLevelOfdm1T[rf_path][i] ;
                              priv->TxPowerLevelCCK[i] = priv->RfTxPwrLevelCck[rf_path][i];
                      }

Signed-off-by: Dan Carpenter <error27@gmail.com>
Cc: Jerry chuang <wlanfae@realtek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/rtl8192su/r8192U_core.c

@@ -3359,6 +3359,46 @@ u8 rtl8192SU_BoardTypeToRFtype(struct net_device* dev,  u8 Boardtype)
 	return RFtype;
 }
 
+void update_hal_variables(struct r8192_priv *priv)
+{
+	int rf_path;
+	int i;
+	u8 index;
+
+	for (rf_path = 0; rf_path < 2; rf_path++) {
+		for (i = 0; i < 3; i++)	{
+			RT_TRACE((COMP_INIT), "CCK RF-%d CHan_Area-%d = 0x%x\n", rf_path, i, priv->RfCckChnlAreaTxPwr[rf_path][i]);
+			RT_TRACE((COMP_INIT), "OFDM-1T RF-%d CHan_Area-%d = 0x%x\n", rf_path, i, priv->RfOfdmChnlAreaTxPwr1T[rf_path][i]);
+			RT_TRACE((COMP_INIT), "OFDM-2T RF-%d CHan_Area-%d = 0x%x\n", rf_path, i, priv->RfOfdmChnlAreaTxPwr2T[rf_path][i]);
+		}
+		/* Assign dedicated channel tx power */
+		for(i = 0; i < 14; i++) {
+			/* channel 1-3 use the same Tx Power Level. */
+			if (i < 3)			/* Channel 1-3 */
+				index = 0;
+			else if (i < 9)			/* Channel 4-9 */
+				index = 1;
+			else				/* Channel 10-14 */
+				index = 2;
+			/* Record A & B CCK /OFDM - 1T/2T Channel area tx power */
+			priv->RfTxPwrLevelCck[rf_path][i] = priv->RfCckChnlAreaTxPwr[rf_path][index];
+			priv->RfTxPwrLevelOfdm1T[rf_path][i]  = priv->RfOfdmChnlAreaTxPwr1T[rf_path][index];
+			priv->RfTxPwrLevelOfdm2T[rf_path][i]  = priv->RfOfdmChnlAreaTxPwr2T[rf_path][index];
+			if (rf_path == 0) {
+				priv->TxPowerLevelOFDM24G[i] = priv->RfTxPwrLevelOfdm1T[rf_path][i] ;
+				priv->TxPowerLevelCCK[i] = priv->RfTxPwrLevelCck[rf_path][i];
+			}
+		}
+		for(i = 0; i < 14; i++) {
+			RT_TRACE((COMP_INIT),
+			"Rf-%d TxPwr CH-%d CCK OFDM_1T OFDM_2T= 0x%x/0x%x/0x%x\n",
+				rf_path, i, priv->RfTxPwrLevelCck[rf_path][i],
+				priv->RfTxPwrLevelOfdm1T[rf_path][i] ,
+				priv->RfTxPwrLevelOfdm2T[rf_path][i] );
+		}
+	}
+}
+
 //
 //	Description:
 //		Config HW adapter information into initial value.
@@ -3374,7 +3414,7 @@ rtl8192SU_ConfigAdapterInfo8192SForAutoLoadFail(struct net_device* dev)
 	struct r8192_priv 	*priv = ieee80211_priv(dev);
 	//u16			i,usValue;
 	//u8 sMacAddr[6] = {0x00, 0xE0, 0x4C, 0x81, 0x92, 0x00};
-	u8		rf_path, index;	// For EEPROM/EFUSE After V0.6_1117
+	u8		rf_path;	// For EEPROM/EFUSE After V0.6_1117
 	int	i;
 
 	RT_TRACE(COMP_INIT, "====> ConfigAdapterInfo8192SForAutoLoadFail\n");
@@ -3454,42 +3494,7 @@ rtl8192SU_ConfigAdapterInfo8192SForAutoLoadFail(struct net_device* dev)
 		}
 	}
 
-	for (i = 0; i < 3; i++)
-	{
-		//RT_TRACE((COMP_EFUSE), "CCK RF-%d CHan_Area-%d = 0x%x\n",  rf_path, i,
-		//priv->RfCckChnlAreaTxPwr[rf_path][i]);
-		//RT_TRACE((COMP_EFUSE), "OFDM-1T RF-%d CHan_Area-%d = 0x%x\n",  rf_path, i,
-		//priv->RfOfdmChnlAreaTxPwr1T[rf_path][i]);
-		//RT_TRACE((COMP_EFUSE), "OFDM-2T RF-%d CHan_Area-%d = 0x%x\n",  rf_path, i,
-		//priv->RfOfdmChnlAreaTxPwr2T[rf_path][i]);
-	}
-
-	// Assign dedicated channel tx power
-	for(i=0; i<14; i++)	// channel 1~3 use the same Tx Power Level.
-		{
-		if (i < 3)			// Cjanel 1-3
-			index = 0;
-		else if (i < 9)		// Channel 4-9
-			index = 1;
-		else				// Channel 10-14
-			index = 2;
-
-		// Record A & B CCK /OFDM - 1T/2T Channel area tx power
-		priv->RfTxPwrLevelCck[rf_path][i]  =
-		priv->RfCckChnlAreaTxPwr[rf_path][index];
-		priv->RfTxPwrLevelOfdm1T[rf_path][i]  =
-		priv->RfOfdmChnlAreaTxPwr1T[rf_path][index];
-		priv->RfTxPwrLevelOfdm2T[rf_path][i]  =
-		priv->RfOfdmChnlAreaTxPwr2T[rf_path][index];
-		}
-
-		for(i=0; i<14; i++)
-		{
-		//RT_TRACE((COMP_EFUSE), "Rf-%d TxPwr CH-%d CCK OFDM_1T OFDM_2T= 0x%x/0x%x/0x%x\n",
-		//rf_path, i, priv->RfTxPwrLevelCck[0][i],
-		//priv->RfTxPwrLevelOfdm1T[0][i] ,
-		//priv->RfTxPwrLevelOfdm2T[0][i] );
-		}
+	update_hal_variables(priv);
 
 	//
 	// Update remained HAL variables.
@@ -3899,53 +3904,7 @@ rtl8192SU_ReadAdapterInfo8192SUsb(struct net_device* dev)
 			}
 
 		}
-//
-		// Update Tx Power HAL variables.
-//
-		for (rf_path = 0; rf_path < 2; rf_path++)
-		{
-			for (i = 0; i < 3; i++)
-			{
-				RT_TRACE((COMP_INIT),  "CCK RF-%d CHan_Area-%d = 0x%x\n",  rf_path, i,
-				priv->RfCckChnlAreaTxPwr[rf_path][i]);
-				RT_TRACE((COMP_INIT), "OFDM-1T RF-%d CHan_Area-%d = 0x%x\n",  rf_path, i,
-				priv->RfOfdmChnlAreaTxPwr1T[rf_path][i]);
-				RT_TRACE((COMP_INIT), "OFDM-2T RF-%d CHan_Area-%d = 0x%x\n",  rf_path, i, priv->RfOfdmChnlAreaTxPwr2T[rf_path][i]);
-			}
-
-			// Assign dedicated channel tx power
-			for(i=0; i<14; i++)	// channel 1~3 use the same Tx Power Level.
-			{
-				if (i < 3)			// Cjanel 1-3
-					index = 0;
-				else if (i < 9)		// Channel 4-9
-					index = 1;
-				else				// Channel 10-14
-					index = 2;
-
-				// Record A & B CCK /OFDM - 1T/2T Channel area tx power
-				priv->RfTxPwrLevelCck[rf_path][i]  =
-				priv->RfCckChnlAreaTxPwr[rf_path][index];
-				priv->RfTxPwrLevelOfdm1T[rf_path][i]  =
-				priv->RfOfdmChnlAreaTxPwr1T[rf_path][index];
-				priv->RfTxPwrLevelOfdm2T[rf_path][i]  =
-				priv->RfOfdmChnlAreaTxPwr2T[rf_path][index];
-				if (rf_path == 0)
-				{
-					priv->TxPowerLevelOFDM24G[i] = priv->RfTxPwrLevelOfdm1T[rf_path][i] ;
-					priv->TxPowerLevelCCK[i] = priv->RfTxPwrLevelCck[rf_path][i];
-				}
-			}
-
-			for(i=0; i<14; i++)
-			{
-				RT_TRACE((COMP_INIT),
-				"Rf-%d TxPwr CH-%d CCK OFDM_1T OFDM_2T= 0x%x/0x%x/0x%x\n",
-				rf_path, i, priv->RfTxPwrLevelCck[rf_path][i],
-				priv->RfTxPwrLevelOfdm1T[rf_path][i] ,
-				priv->RfTxPwrLevelOfdm2T[rf_path][i] );
-			}
-		}
+		update_hal_variables(priv);
 	}
 
 	//